<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:bfbd0542-b7a1-4dc9-978d-9d12f7638d17,g:9e9f2c18-6537-4f16-9883-646e6c1455b6-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.mastec.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="mtz-20221231.xsd#ConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" id="i66868d79f8924cb98cb6b722a9f6dc45_ConsolidatedBalanceSheetsParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_0eba756e-45a7-4e28-8747-cd79d51dd657" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_0eba756e-45a7-4e28-8747-cd79d51dd657" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_2bc253d6-c48a-4481-b6e8-f41ba944ffee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_2bc253d6-c48a-4481-b6e8-f41ba944ffee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_b9886e83-5548-4e94-b766-3579e5bbc207" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_PreferredStockSharesIssued_b9886e83-5548-4e94-b766-3579e5bbc207" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_5c610ed2-cf5f-4f06-8fa8-40afeeb669f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_5c610ed2-cf5f-4f06-8fa8-40afeeb669f5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_5311328e-a7cf-4587-b477-90b378bd03cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_5311328e-a7cf-4587-b477-90b378bd03cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_4f96a6cc-176e-454a-bd98-df2859e9f82c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_4f96a6cc-176e-454a-bd98-df2859e9f82c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_30ce6a23-015c-4f59-a63a-2b4db2ef3fb0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_CommonStockSharesIssued_30ce6a23-015c-4f59-a63a-2b4db2ef3fb0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_723fea93-d0c5-415e-aed2-8c393d25ac13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_723fea93-d0c5-415e-aed2-8c393d25ac13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_80760357-4ff8-4049-ab0b-7d6fe77f441c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_TreasuryStockCommonShares_80760357-4ff8-4049-ab0b-7d6fe77f441c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1fd185fd-1f12-4f98-8740-05e2d3a2ec3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_ef9b62c9-969b-47af-b68a-cce5a01cbc5d" xlink:to="loc_us-gaap_StatementTable_1fd185fd-1f12-4f98-8740-05e2d3a2ec3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_2534da61-08c5-4937-ab08-a1332ca710ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1fd185fd-1f12-4f98-8740-05e2d3a2ec3a" xlink:to="loc_us-gaap_AwardTypeAxis_2534da61-08c5-4937-ab08-a1332ca710ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2534da61-08c5-4937-ab08-a1332ca710ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_2534da61-08c5-4937-ab08-a1332ca710ad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2534da61-08c5-4937-ab08-a1332ca710ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1eebf7d3-0a59-4a11-a18d-b897e903322c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_2534da61-08c5-4937-ab08-a1332ca710ad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1eebf7d3-0a59-4a11-a18d-b897e903322c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_50f93478-7384-4682-9433-7ba812ad195b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1eebf7d3-0a59-4a11-a18d-b897e903322c" xlink:to="loc_us-gaap_RestrictedStockMember_50f93478-7384-4682-9433-7ba812ad195b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1fd185fd-1f12-4f98-8740-05e2d3a2ec3a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3" xlink:to="loc_us-gaap_EquityComponentDomain_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5405704d-6ef0-4edd-b267-868cd1c836ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bf7f0890-c8e5-45a8-a11c-4daf6849a3b3" xlink:to="loc_us-gaap_EquityComponentDomain_5405704d-6ef0-4edd-b267-868cd1c836ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_57e34775-3da6-4dce-a960-5b294fae68ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5405704d-6ef0-4edd-b267-868cd1c836ae" xlink:to="loc_us-gaap_CommonStockMember_57e34775-3da6-4dce-a960-5b294fae68ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="mtz-20221231.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended" id="ib5d64e8688b04062b029fbabc3710cd3_CONSOLIDATEDSTATEMENTSOFEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f84b2a81-63e2-407f-809d-95f78a0552e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f84b2a81-63e2-407f-809d-95f78a0552e8" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_34f4d999-bc26-44ad-ac6c-86487121cfa4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_CommonStockSharesIssued_34f4d999-bc26-44ad-ac6c-86487121cfa4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_07d332ff-bac8-4fa4-92e3-a4d124fc61aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_07d332ff-bac8-4fa4-92e3-a4d124fc61aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_1b969cbc-c1e1-4959-b3e1-16840ee0a08e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_TreasuryStockCommonShares_1b969cbc-c1e1-4959-b3e1-16840ee0a08e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_1c13aedf-2122-44ab-a0cf-1292b906d330" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_ProfitLoss_1c13aedf-2122-44ab-a0cf-1292b906d330" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_42c58a8e-08c5-492b-8dbb-2bd76aef0f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_42c58a8e-08c5-492b-8dbb-2bd76aef0f9a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e580d164-18fb-4f13-bb67-e296071c7e77" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e580d164-18fb-4f13-bb67-e296071c7e77" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_e22c20c0-556f-4757-8ccb-ff851d2bff1c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_e22c20c0-556f-4757-8ccb-ff851d2bff1c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_497c589e-92df-46ec-9efd-c7f52c0a30da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_497c589e-92df-46ec-9efd-c7f52c0a30da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesOther_47396ace-4c68-4390-8ea6-09dbf828c5d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesOther_47396ace-4c68-4390-8ea6-09dbf828c5d6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueOther_03890533-e262-4b2f-98ea-0b73621edc53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueOther_03890533-e262-4b2f-98ea-0b73621edc53" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_631b83fd-08f1-436d-8736-fd5d48e7d280" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_631b83fd-08f1-436d-8736-fd5d48e7d280" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_8ea533ed-1a04-43bf-a625-d2270d54c68e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_8ea533ed-1a04-43bf-a625-d2270d54c68e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_6f55e8f1-efdb-40dc-8947-061ee7dc3089" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_6f55e8f1-efdb-40dc-8947-061ee7dc3089" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_63ab129c-237a-4032-90ee-1fac30e81898" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_63ab129c-237a-4032-90ee-1fac30e81898" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_7fefb88c-4115-4c54-ade8-3d7958c97a19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_7fefb88c-4115-4c54-ade8-3d7958c97a19" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_309dc455-2380-4a43-ade8-bc8cf46d9a44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_36442b09-c879-4ede-89da-8c5316c84262" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_309dc455-2380-4a43-ade8-bc8cf46d9a44" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_c7a05983-81f2-484d-9b6e-8be7b3158179" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f9184772-64b6-43e5-a62c-7291f447f1d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_7996eeac-be53-4799-b474-9828ad9d887a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_713d529a-4f69-40bf-93cc-93c9e52dc623" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f84b2a81-63e2-407f-809d-95f78a0552e8" xlink:to="loc_us-gaap_StatementTable_713d529a-4f69-40bf-93cc-93c9e52dc623" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_713d529a-4f69-40bf-93cc-93c9e52dc623" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1" xlink:to="loc_us-gaap_EquityComponentDomain_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4a1296f1-bc0d-4b01-87e6-a7bcaeea55e1" xlink:to="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f9a317bb-2211-4e62-ac73-cd24f34068e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_CommonStockMember_f9a317bb-2211-4e62-ac73-cd24f34068e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_e2260f5c-0c27-4a33-bf5d-07349d051f86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_TreasuryStockCommonMember_e2260f5c-0c27-4a33-bf5d-07349d051f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_611395cc-01f6-4669-9313-7190d9d8d0e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_611395cc-01f6-4669-9313-7190d9d8d0e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_0dc648a9-710d-4125-83e0-ed9658b9c003" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_RetainedEarningsMember_0dc648a9-710d-4125-83e0-ed9658b9c003" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_38437246-c4c4-4cff-9b99-763740d8752a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_38437246-c4c4-4cff-9b99-763740d8752a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_348334d2-aa50-4d49-86d6-8dd0cf18c657" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_ParentMember_348334d2-aa50-4d49-86d6-8dd0cf18c657" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_f315dd03-9ff6-4c8d-8c80-60f20c121280" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08d4b03c-7bb6-4414-a62a-4b09ad90ded7" xlink:to="loc_us-gaap_NoncontrollingInterestMember_f315dd03-9ff6-4c8d-8c80-60f20c121280" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="simple" xlink:href="mtz-20221231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="extended" id="ida001f5f6f9c4d5ab1cf25432431d281_CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_6fe26624-513f-4f3f-920f-52fb6be051bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_26c1e590-a243-417c-8d20-4ea6e8a8f548" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6fe26624-513f-4f3f-920f-52fb6be051bc" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_26c1e590-a243-417c-8d20-4ea6e8a8f548" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_463caa99-ad09-42b6-8876-1ec9e4dfdf9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_6fe26624-513f-4f3f-920f-52fb6be051bc" xlink:to="loc_us-gaap_StatementTable_463caa99-ad09-42b6-8876-1ec9e4dfdf9e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_34166a4d-303d-4a24-9d19-55445995f8c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_463caa99-ad09-42b6-8876-1ec9e4dfdf9e" xlink:to="loc_us-gaap_DebtInstrumentAxis_34166a4d-303d-4a24-9d19-55445995f8c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_34166a4d-303d-4a24-9d19-55445995f8c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_34166a4d-303d-4a24-9d19-55445995f8c1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_34166a4d-303d-4a24-9d19-55445995f8c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_26e06f9d-4b95-40b2-a66d-39007c3ed631" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_34166a4d-303d-4a24-9d19-55445995f8c1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_26e06f9d-4b95-40b2-a66d-39007c3ed631" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointFivePercentSeniorNotesMember_218b935c-b3f0-44b0-9cf0-941b88a6ef55" xlink:href="mtz-20221231.xsd#mtz_FourPointFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_26e06f9d-4b95-40b2-a66d-39007c3ed631" xlink:to="loc_mtz_FourPointFivePercentSeniorNotesMember_218b935c-b3f0-44b0-9cf0-941b88a6ef55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_53383fe9-243f-44e8-8cc1-137a927d2d4f" xlink:href="mtz-20221231.xsd#mtz_FourPointEightSevenFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_26e06f9d-4b95-40b2-a66d-39007c3ed631" xlink:to="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_53383fe9-243f-44e8-8cc1-137a927d2d4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_235df50b-9a2a-4961-8fa8-0254b220f3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_463caa99-ad09-42b6-8876-1ec9e4dfdf9e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_235df50b-9a2a-4961-8fa8-0254b220f3e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_235df50b-9a2a-4961-8fa8-0254b220f3e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_235df50b-9a2a-4961-8fa8-0254b220f3e7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_235df50b-9a2a-4961-8fa8-0254b220f3e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b237c85f-9827-4f05-8a76-7ab2ebfdcfe9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_235df50b-9a2a-4961-8fa8-0254b220f3e7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b237c85f-9827-4f05-8a76-7ab2ebfdcfe9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_35ecb7d9-6ce1-4dcd-99e2-1bc68dc63c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b237c85f-9827-4f05-8a76-7ab2ebfdcfe9" xlink:to="loc_us-gaap_SeniorNotesMember_35ecb7d9-6ce1-4dcd-99e2-1bc68dc63c9e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#BusinessBasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended" id="iecda204cb0ed43508d3bd0014f6b5c0b_BusinessBasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:href="mtz-20221231.xsd#mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_92e25010-42b2-4384-9e78-6fd82d402ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_NumberOfReportableSegments_92e25010-42b2-4384-9e78-6fd82d402ff7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedPayrollTaxesCurrentAndNoncurrent_9afe2ddb-515f-4d5a-a6c7-72d617a55bae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedPayrollTaxesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_AccruedPayrollTaxesCurrentAndNoncurrent_9afe2ddb-515f-4d5a-a6c7-72d617a55bae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryValuationReserves_cea65a11-07da-42b7-ae82-cf84d285ab6a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryValuationReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_InventoryValuationReserves_cea65a11-07da-42b7-ae82-cf84d285ab6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7553e848-87e5-493a-8609-1021e20c8a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7553e848-87e5-493a-8609-1021e20c8a0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_VariableInterestEntityNonconsolidatedCarryingAmountOfAssetsAndLiabilities_a3599948-7b65-4ab1-92a7-188bc47266ab" xlink:href="mtz-20221231.xsd#mtz_VariableInterestEntityNonconsolidatedCarryingAmountOfAssetsAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_mtz_VariableInterestEntityNonconsolidatedCarryingAmountOfAssetsAndLiabilities_a3599948-7b65-4ab1-92a7-188bc47266ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_169cb922-771b-4af4-a2c6-d1dce2b6aec5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_169cb922-771b-4af4-a2c6-d1dce2b6aec5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_abae182a-9b2a-459b-946b-261ff49ecfc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_abae182a-9b2a-459b-946b-261ff49ecfc3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4c2c7428-495d-4f0d-9534-e620d3d3da9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4c2c7428-495d-4f0d-9534-e620d3d3da9f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_2e727905-a411-4a51-a969-01a4cfaec2e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_2e727905-a411-4a51-a969-01a4cfaec2e4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_32cc8f23-f84e-4c70-aaed-b8158a51a8ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_32cc8f23-f84e-4c70-aaed-b8158a51a8ac" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_d41eda30-e14f-44fa-ba8b-0611996d1cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_d41eda30-e14f-44fa-ba8b-0611996d1cf5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_53354cf7-eb4b-4d7b-901e-32a7f1a8bdab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_53354cf7-eb4b-4d7b-901e-32a7f1a8bdab" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LesseeLeaseTermOfContract_283196a1-930d-4adc-888d-a1bac37d80e0" xlink:href="mtz-20221231.xsd#mtz_LesseeLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_mtz_LesseeLeaseTermOfContract_283196a1-930d-4adc-888d-a1bac37d80e0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MalpracticeInsuranceDeductible1_eb6c596a-34a3-4cc6-9873-393eb956424e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MalpracticeInsuranceDeductible1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_us-gaap_MalpracticeInsuranceDeductible1_eb6c596a-34a3-4cc6-9873-393eb956424e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LossContingencyRangeOfPossibleLossMaximumPerEmployee_460f9ec3-fa3d-4351-a27d-c0cc15b3de88" xlink:href="mtz-20221231.xsd#mtz_LossContingencyRangeOfPossibleLossMaximumPerEmployee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_mtz_LossContingencyRangeOfPossibleLossMaximumPerEmployee_460f9ec3-fa3d-4351-a27d-c0cc15b3de88" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LesseeLeaseRenewalTerm_d2deecec-d96f-4445-829c-6f2333462797" xlink:href="mtz-20221231.xsd#mtz_LesseeLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_mtz_LesseeLeaseRenewalTerm_d2deecec-d96f-4445-829c-6f2333462797" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:href="mtz-20221231.xsd#mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesLineItems_30b7613a-593c-4c76-aade-673bc9574e1e" xlink:to="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e498d2f9-1673-4a77-9552-3f84edb6c167" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_srt_RangeAxis_e498d2f9-1673-4a77-9552-3f84edb6c167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e498d2f9-1673-4a77-9552-3f84edb6c167_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e498d2f9-1673-4a77-9552-3f84edb6c167" xlink:to="loc_srt_RangeMember_e498d2f9-1673-4a77-9552-3f84edb6c167_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b9fe19c0-dcbb-4d8c-b182-82c379314f37" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e498d2f9-1673-4a77-9552-3f84edb6c167" xlink:to="loc_srt_RangeMember_b9fe19c0-dcbb-4d8c-b182-82c379314f37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f62291d2-4922-4186-bb4d-3512163fa82b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b9fe19c0-dcbb-4d8c-b182-82c379314f37" xlink:to="loc_srt_MaximumMember_f62291d2-4922-4186-bb4d-3512163fa82b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c44d8113-8a9e-4e90-9b93-bd55f6ce9add" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b9fe19c0-dcbb-4d8c-b182-82c379314f37" xlink:to="loc_srt_MinimumMember_c44d8113-8a9e-4e90-9b93-bd55f6ce9add" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_db927cde-c6b5-4d1d-9d1d-4360570517e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_db927cde-c6b5-4d1d-9d1d-4360570517e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_db927cde-c6b5-4d1d-9d1d-4360570517e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_db927cde-c6b5-4d1d-9d1d-4360570517e6" xlink:to="loc_us-gaap_RelatedPartyDomain_db927cde-c6b5-4d1d-9d1d-4360570517e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_7f15d8e1-210c-4217-ba19-bbf4431660ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_db927cde-c6b5-4d1d-9d1d-4360570517e6" xlink:to="loc_us-gaap_RelatedPartyDomain_7f15d8e1-210c-4217-ba19-bbf4431660ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_8dd37076-4c58-42cf-8eff-f16637e5a506" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_7f15d8e1-210c-4217-ba19-bbf4431660ca" xlink:to="loc_us-gaap_CorporateJointVentureMember_8dd37076-4c58-42cf-8eff-f16637e5a506" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f2613dd3-f186-471a-9d55-d4627230fc53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f2613dd3-f186-471a-9d55-d4627230fc53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_f2613dd3-f186-471a-9d55-d4627230fc53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f2613dd3-f186-471a-9d55-d4627230fc53" xlink:to="loc_us-gaap_LossContingencyNatureDomain_f2613dd3-f186-471a-9d55-d4627230fc53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_5c5a4790-d625-4cdc-9fcb-55b01541f69d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f2613dd3-f186-471a-9d55-d4627230fc53" xlink:to="loc_us-gaap_LossContingencyNatureDomain_5c5a4790-d625-4cdc-9fcb-55b01541f69d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UninsuredRiskMember_942ce5d9-6b3b-4730-83d4-70cfc62087e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UninsuredRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_5c5a4790-d625-4cdc-9fcb-55b01541f69d" xlink:to="loc_us-gaap_UninsuredRiskMember_942ce5d9-6b3b-4730-83d4-70cfc62087e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_srt_ProductOrServiceAxis_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc" xlink:to="loc_srt_ProductsAndServicesDomain_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_69f84a2b-2dc1-4e19-ab1a-066bbb5423cc" xlink:to="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_419cf4da-94c3-4efc-80fa-e2cc9936b994" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccidentAndHealthInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:to="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_419cf4da-94c3-4efc-80fa-e2cc9936b994" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralLiabilityMember_782586a9-8b05-4d66-a31a-692377ac2aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:to="loc_us-gaap_GeneralLiabilityMember_782586a9-8b05-4d66-a31a-692377ac2aa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyInsuranceProductLineMember_7f660f96-052f-4a34-90cf-5282507b9708" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyInsuranceProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:to="loc_us-gaap_PropertyInsuranceProductLineMember_7f660f96-052f-4a34-90cf-5282507b9708" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroupPoliciesMember_fdc7b2bb-cc8a-4d17-a323-b03814b161b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GroupPoliciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_00e6b2ee-947b-4941-b0f3-41f24e6bc60f" xlink:to="loc_us-gaap_GroupPoliciesMember_fdc7b2bb-cc8a-4d17-a323-b03814b161b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_27d27f1d-aefb-4c4c-92c7-c6c682a89494" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_27d27f1d-aefb-4c4c-92c7-c6c682a89494" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_27d27f1d-aefb-4c4c-92c7-c6c682a89494_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_27d27f1d-aefb-4c4c-92c7-c6c682a89494" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_27d27f1d-aefb-4c4c-92c7-c6c682a89494_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c2127a68-0f11-4b72-9041-b86f3fa95d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_27d27f1d-aefb-4c4c-92c7-c6c682a89494" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c2127a68-0f11-4b72-9041-b86f3fa95d9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobilesMember_4d99ceb5-52fd-4873-88a1-72b221e6220a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AutomobilesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c2127a68-0f11-4b72-9041-b86f3fa95d9b" xlink:to="loc_us-gaap_AutomobilesMember_4d99ceb5-52fd-4873-88a1-72b221e6220a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_61e4e78c-66e4-4742-a935-888f0b58f4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_DebtInstrumentAxis_61e4e78c-66e4-4742-a935-888f0b58f4c9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_61e4e78c-66e4-4742-a935-888f0b58f4c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_61e4e78c-66e4-4742-a935-888f0b58f4c9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_61e4e78c-66e4-4742-a935-888f0b58f4c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_27618853-1b1e-4830-a972-126584800416" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_61e4e78c-66e4-4742-a935-888f0b58f4c9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_27618853-1b1e-4830-a972-126584800416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_6e370d1c-dff0-4794-afc9-fd4b0c624dae" xlink:href="mtz-20221231.xsd#mtz_FourPointEightSevenFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_27618853-1b1e-4830-a972-126584800416" xlink:to="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_6e370d1c-dff0-4794-afc9-fd4b0c624dae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0d5f2aed-78ac-4180-b03c-03977e94576a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0d5f2aed-78ac-4180-b03c-03977e94576a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0d5f2aed-78ac-4180-b03c-03977e94576a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0d5f2aed-78ac-4180-b03c-03977e94576a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0d5f2aed-78ac-4180-b03c-03977e94576a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_19d095b3-23ae-4c70-8647-96eecff4520f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0d5f2aed-78ac-4180-b03c-03977e94576a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_19d095b3-23ae-4c70-8647-96eecff4520f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_c43cb563-ed8f-4c09-932e-d621c31a2c65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_19d095b3-23ae-4c70-8647-96eecff4520f" xlink:to="loc_us-gaap_SeniorNotesMember_c43cb563-ed8f-4c09-932e-d621c31a2c65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LeaseArrangementsAxis_f254385e-ec71-4338-b65f-db959da8761a" xlink:href="mtz-20221231.xsd#mtz_LeaseArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_mtz_LeaseArrangementsAxis_f254385e-ec71-4338-b65f-db959da8761a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LeaseArrangementsDomain_f254385e-ec71-4338-b65f-db959da8761a_default" xlink:href="mtz-20221231.xsd#mtz_LeaseArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mtz_LeaseArrangementsAxis_f254385e-ec71-4338-b65f-db959da8761a" xlink:to="loc_mtz_LeaseArrangementsDomain_f254385e-ec71-4338-b65f-db959da8761a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LeaseArrangementsDomain_2079551d-7fd0-4c88-805f-450f8c9208cf" xlink:href="mtz-20221231.xsd#mtz_LeaseArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mtz_LeaseArrangementsAxis_f254385e-ec71-4338-b65f-db959da8761a" xlink:to="loc_mtz_LeaseArrangementsDomain_2079551d-7fd0-4c88-805f-450f8c9208cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquipmentLeasesMember_264b04cf-ed9f-4838-a235-02616025a941" xlink:href="mtz-20221231.xsd#mtz_EquipmentLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_LeaseArrangementsDomain_2079551d-7fd0-4c88-805f-450f8c9208cf" xlink:to="loc_mtz_EquipmentLeasesMember_264b04cf-ed9f-4838-a235-02616025a941" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FacilityLeasesMember_e32eafab-beff-4043-b314-790c0c96f308" xlink:href="mtz-20221231.xsd#mtz_FacilityLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_LeaseArrangementsDomain_2079551d-7fd0-4c88-805f-450f8c9208cf" xlink:to="loc_mtz_FacilityLeasesMember_e32eafab-beff-4043-b314-790c0c96f308" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_BusinessBasisOfPresentationAndSignificantAccountingPoliciesTable_8f009ce3-168c-452b-befb-e824c7a55fec" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ba478049-010c-4034-b512-34105be2b4ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_13129ebd-74b3-4f7a-bd7d-bc5be2ec662b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ba478049-010c-4034-b512-34105be2b4ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsMember_86e46491-12bc-40be-968d-31fb0704039f" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ba478049-010c-4034-b512-34105be2b4ab" xlink:to="loc_mtz_A2022AcquisitionsMember_86e46491-12bc-40be-968d-31fb0704039f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended" id="i5dca1c70058d4b2a8b78bd2757790741_BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_74b1a385-95f1-4f62-8fda-1171c4918262" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_74b1a385-95f1-4f62-8fda-1171c4918262" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage_52cbed0a-2172-4eb3-a96a-df5805bd48e1" xlink:href="mtz-20221231.xsd#mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage_52cbed0a-2172-4eb3-a96a-df5805bd48e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_01b10dee-3148-4725-bb91-2b3288060ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_01b10dee-3148-4725-bb91-2b3288060ca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2250c031-4ccd-450c-a78c-cd63d14dc240" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2250c031-4ccd-450c-a78c-cd63d14dc240" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_7c92204f-8a0d-4f6e-ac4f-2d65ee202b35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_7c92204f-8a0d-4f6e-ac4f-2d65ee202b35" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear_a0a8b71f-9ff4-42f2-b444-178165cd692c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear_a0a8b71f-9ff4-42f2-b444-178165cd692c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval_b3e24a18-4238-4786-b3a0-17cccc6d4fba" xlink:href="mtz-20221231.xsd#mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval_b3e24a18-4238-4786-b3a0-17cccc6d4fba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_6e0cf4c3-bb2c-420f-8f69-5e3bd4a9764b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:to="loc_us-gaap_SalesRevenueNetMember_6e0cf4c3-bb2c-420f-8f69-5e3bd4a9764b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_29efd85c-e15f-43e0-8c0b-76d6764b37c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_29efd85c-e15f-43e0-8c0b-76d6764b37c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_3bd24c36-cf6e-43b4-b263-fa82ad307632" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_3bd24c36-cf6e-43b4-b263-fa82ad307632" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ac3489c4-0362-4c62-a049-ef9d560a105a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:to="loc_srt_ProductsAndServicesDomain_ac3489c4-0362-4c62-a049-ef9d560a105a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:to="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MasterServiceAndOtherServiceAgreementsMember_0fcb148c-901e-4526-98e2-c96cf277b9a9" xlink:href="mtz-20221231.xsd#mtz_MasterServiceAndOtherServiceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:to="loc_mtz_MasterServiceAndOtherServiceAgreementsMember_0fcb148c-901e-4526-98e2-c96cf277b9a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e9f42043-7d93-4242-88d4-d1cfea76b3ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e9f42043-7d93-4242-88d4-d1cfea76b3ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_a667ae80-6975-4c5d-8ed3-6db82f9d6d99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_a667ae80-6975-4c5d-8ed3-6db82f9d6d99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_48f7beda-42ff-412a-ab99-61c04bc3781d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:to="loc_srt_RangeMember_48f7beda-42ff-412a-ab99-61c04bc3781d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:to="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c8509bee-8ab4-4239-a396-ae6d331e3613" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:to="loc_srt_MaximumMember_c8509bee-8ab4-4239-a396-ae6d331e3613" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_41fe2353-2b42-4a5b-9da0-5556017a6a85" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_41fe2353-2b42-4a5b-9da0-5556017a6a85" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails_1" xlink:type="simple" xlink:href="mtz-20221231.xsd#BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails_1"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails_1" xlink:type="extended" id="if691e4d00e17432e8b0907e01c6ddbf9_BusinessBasisofPresentationandSignificantAccountingPoliciesRevenueRecognitionDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_74b1a385-95f1-4f62-8fda-1171c4918262" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_74b1a385-95f1-4f62-8fda-1171c4918262" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage_52cbed0a-2172-4eb3-a96a-df5805bd48e1" xlink:href="mtz-20221231.xsd#mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage_52cbed0a-2172-4eb3-a96a-df5805bd48e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_01b10dee-3148-4725-bb91-2b3288060ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_01b10dee-3148-4725-bb91-2b3288060ca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2250c031-4ccd-450c-a78c-cd63d14dc240" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2250c031-4ccd-450c-a78c-cd63d14dc240" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_7c92204f-8a0d-4f6e-ac4f-2d65ee202b35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_7c92204f-8a0d-4f6e-ac4f-2d65ee202b35" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear_a0a8b71f-9ff4-42f2-b444-178165cd692c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedWithinOneYear_a0a8b71f-9ff4-42f2-b444-178165cd692c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval_b3e24a18-4238-4786-b3a0-17cccc6d4fba" xlink:href="mtz-20221231.xsd#mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval_b3e24a18-4238-4786-b3a0-17cccc6d4fba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_b0b9bee8-a4ff-4582-a674-46d956e86186" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c6b1ab26-6ec2-4dfe-afe2-e89acc82bd76" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_6e0cf4c3-bb2c-420f-8f69-5e3bd4a9764b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_b1e1b912-c6a5-43dd-889d-b8a17554c447" xlink:to="loc_us-gaap_SalesRevenueNetMember_6e0cf4c3-bb2c-420f-8f69-5e3bd4a9764b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_29efd85c-e15f-43e0-8c0b-76d6764b37c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_29efd85c-e15f-43e0-8c0b-76d6764b37c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_29efd85c-e15f-43e0-8c0b-76d6764b37c6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_3bd24c36-cf6e-43b4-b263-fa82ad307632" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_74c6c5de-cedd-4830-9c18-342023bee72f" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_3bd24c36-cf6e-43b4-b263-fa82ad307632" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ac3489c4-0362-4c62-a049-ef9d560a105a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:to="loc_srt_ProductsAndServicesDomain_ac3489c4-0362-4c62-a049-ef9d560a105a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ac3489c4-0362-4c62-a049-ef9d560a105a" xlink:to="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MasterServiceAndOtherServiceAgreementsMember_0fcb148c-901e-4526-98e2-c96cf277b9a9" xlink:href="mtz-20221231.xsd#mtz_MasterServiceAndOtherServiceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f5886297-0605-4502-8586-44179bace675" xlink:to="loc_mtz_MasterServiceAndOtherServiceAgreementsMember_0fcb148c-901e-4526-98e2-c96cf277b9a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e9f42043-7d93-4242-88d4-d1cfea76b3ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_e9f42043-7d93-4242-88d4-d1cfea76b3ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_e9f42043-7d93-4242-88d4-d1cfea76b3ae" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_a667ae80-6975-4c5d-8ed3-6db82f9d6d99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_63b9abab-f0f4-4b53-9177-e7595dde28b1" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_a667ae80-6975-4c5d-8ed3-6db82f9d6d99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_17d28ebf-aea6-4c3f-b779-aa1ac88ef361" xlink:to="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_48f7beda-42ff-412a-ab99-61c04bc3781d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:to="loc_srt_RangeMember_48f7beda-42ff-412a-ab99-61c04bc3781d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_48f7beda-42ff-412a-ab99-61c04bc3781d" xlink:to="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c8509bee-8ab4-4239-a396-ae6d331e3613" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88796b65-e6f0-4196-ab51-91ea51dcacf1" xlink:to="loc_srt_MaximumMember_c8509bee-8ab4-4239-a396-ae6d331e3613" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesGoodwillandIndefiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#BusinessBasisofPresentationandSignificantAccountingPoliciesGoodwillandIndefiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesGoodwillandIndefiniteLivedIntangibleAssetsDetails" xlink:type="extended" id="iab8f8caa866743bb810bd8b7ae349b18_BusinessBasisofPresentationandSignificantAccountingPoliciesGoodwillandIndefiniteLivedIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportingUnits_7100f55a-a59d-4da9-a765-dacbee3717ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_us-gaap_NumberOfReportingUnits_7100f55a-a59d-4da9-a765-dacbee3717ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_GoodwillImpairmentTestingMeasurementInput_93380abe-96c5-4e75-bc88-3216e8ac248f" xlink:href="mtz-20221231.xsd#mtz_GoodwillImpairmentTestingMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_mtz_GoodwillImpairmentTestingMeasurementInput_93380abe-96c5-4e75-bc88-3216e8ac248f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_884cc5d1-b776-413e-8a98-58e78d239bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_us-gaap_Goodwill_884cc5d1-b776-413e-8a98-58e78d239bc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_ab666ba0-ae3c-438d-bfcf-f3835ad876fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_ab666ba0-ae3c-438d-bfcf-f3835ad876fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ImpairmentTestingDiscountRateSensitivityAnalysisSpreadOnDiscountRateForWhichEvaluationWasCompleted_18d59d02-3e4c-4978-bcc0-476775a5ab90" xlink:href="mtz-20221231.xsd#mtz_ImpairmentTestingDiscountRateSensitivityAnalysisSpreadOnDiscountRateForWhichEvaluationWasCompleted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_mtz_ImpairmentTestingDiscountRateSensitivityAnalysisSpreadOnDiscountRateForWhichEvaluationWasCompleted_18d59d02-3e4c-4978-bcc0-476775a5ab90" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfReportingComponents_b234ba24-3120-48b6-9072-9beb2b8493ea" xlink:href="mtz-20221231.xsd#mtz_NumberOfReportingComponents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_mtz_NumberOfReportingComponents_b234ba24-3120-48b6-9072-9beb2b8493ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_e8c7b337-2e1e-4d3f-90d6-cfa3588be471" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992" xlink:to="loc_us-gaap_SegmentDomain_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4e611d71-1367-4fb3-8fd2-dc0e9c00efbc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_dfe1a2ce-dc72-4ad2-b64c-dbbe6ee24992" xlink:to="loc_us-gaap_SegmentDomain_4e611d71-1367-4fb3-8fd2-dc0e9c00efbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember_c62682ba-a893-417a-bc82-0165d9ffb6de" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4e611d71-1367-4fb3-8fd2-dc0e9c00efbc" xlink:to="loc_mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember_c62682ba-a893-417a-bc82-0165d9ffb6de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_f1bc3400-2a77-4733-8d8e-b78cdd807307" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember_c62682ba-a893-417a-bc82-0165d9ffb6de" xlink:to="loc_mtz_OilAndGasSegmentMember_f1bc3400-2a77-4733-8d8e-b78cdd807307" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_e4517e73-5a14-4326-9a95-97e4a66a85da" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember_c62682ba-a893-417a-bc82-0165d9ffb6de" xlink:to="loc_mtz_PowerDeliveryMember_e4517e73-5a14-4326-9a95-97e4a66a85da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_b757cc4f-eec4-40bd-80c4-0cd39a5d615a" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_CleanEnergyAndInfrastructureCommunicationsAndOilAndGasMember_c62682ba-a893-417a-bc82-0165d9ffb6de" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_b757cc4f-eec4-40bd-80c4-0cd39a5d615a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_3c9b8723-5696-43df-a235-a092709e3ae5" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4e611d71-1367-4fb3-8fd2-dc0e9c00efbc" xlink:to="loc_mtz_CommunicationsMember_3c9b8723-5696-43df-a235-a092709e3ae5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:to="loc_srt_RangeAxis_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d" xlink:to="loc_srt_RangeMember_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f66b3139-32b3-4689-a188-fe95fb5ee0f7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4086a1ef-5c58-4f37-bac7-5b643bcd1a7d" xlink:to="loc_srt_RangeMember_f66b3139-32b3-4689-a188-fe95fb5ee0f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8204852f-24c6-45d9-9c69-312eba897805" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f66b3139-32b3-4689-a188-fe95fb5ee0f7" xlink:to="loc_srt_MaximumMember_8204852f-24c6-45d9-9c69-312eba897805" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_16d37142-4af8-407d-901e-d176ba805a21" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f66b3139-32b3-4689-a188-fe95fb5ee0f7" xlink:to="loc_srt_MinimumMember_16d37142-4af8-407d-901e-d176ba805a21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_c4ba47b5-b951-4319-9c60-aeb3466b2c46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_c4ba47b5-b951-4319-9c60-aeb3466b2c46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_c4ba47b5-b951-4319-9c60-aeb3466b2c46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_c4ba47b5-b951-4319-9c60-aeb3466b2c46" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_c4ba47b5-b951-4319-9c60-aeb3466b2c46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_77e6b931-330b-40eb-b49d-828659c51d84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_c4ba47b5-b951-4319-9c60-aeb3466b2c46" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_77e6b931-330b-40eb-b49d-828659c51d84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputLongTermRevenueGrowthRateMember_ec2222e8-8772-4fac-bbfc-bbb7e5df4c88" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputLongTermRevenueGrowthRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_77e6b931-330b-40eb-b49d-828659c51d84" xlink:to="loc_us-gaap_MeasurementInputLongTermRevenueGrowthRateMember_ec2222e8-8772-4fac-bbfc-bbb7e5df4c88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfYearsOfDiscountedCashFlowsMember_953028c2-47cd-42de-a70b-9afbd7701b75" xlink:href="mtz-20221231.xsd#mtz_NumberOfYearsOfDiscountedCashFlowsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_77e6b931-330b-40eb-b49d-828659c51d84" xlink:to="loc_mtz_NumberOfYearsOfDiscountedCashFlowsMember_953028c2-47cd-42de-a70b-9afbd7701b75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_647b074d-d959-496d-8652-d52d6039292a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_77e6b931-330b-40eb-b49d-828659c51d84" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_647b074d-d959-496d-8652-d52d6039292a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_07289723-ef25-4e65-ba1c-1e35744e8d5f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_07289723-ef25-4e65-ba1c-1e35744e8d5f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_07289723-ef25-4e65-ba1c-1e35744e8d5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_07289723-ef25-4e65-ba1c-1e35744e8d5f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_07289723-ef25-4e65-ba1c-1e35744e8d5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1ccff379-df57-49f4-b045-79df95a1bdfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_07289723-ef25-4e65-ba1c-1e35744e8d5f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1ccff379-df57-49f4-b045-79df95a1bdfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillMember_7cd2cd9a-3b0a-457e-8837-5b098d21fb9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1ccff379-df57-49f4-b045-79df95a1bdfb" xlink:to="loc_us-gaap_GoodwillMember_7cd2cd9a-3b0a-457e-8837-5b098d21fb9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitAxis_44d6af2b-4cd7-4dcc-9b48-536fddfe5752" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReportingUnitAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ffbfbea7-c378-4d96-9e84-0380c76657c5" xlink:to="loc_us-gaap_ReportingUnitAxis_44d6af2b-4cd7-4dcc-9b48-536fddfe5752" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_44d6af2b-4cd7-4dcc-9b48-536fddfe5752_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReportingUnitAxis_44d6af2b-4cd7-4dcc-9b48-536fddfe5752" xlink:to="loc_us-gaap_ReportingUnitDomain_44d6af2b-4cd7-4dcc-9b48-536fddfe5752_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_fc18c5cb-b860-495d-af7f-588a7c489c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReportingUnitAxis_44d6af2b-4cd7-4dcc-9b48-536fddfe5752" xlink:to="loc_us-gaap_ReportingUnitDomain_fc18c5cb-b860-495d-af7f-588a7c489c8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OneReportingUnitMember_a7a2ec49-a36f-4c5a-a783-f72cd6308dfb" xlink:href="mtz-20221231.xsd#mtz_OneReportingUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_fc18c5cb-b860-495d-af7f-588a7c489c8a" xlink:to="loc_mtz_OneReportingUnitMember_a7a2ec49-a36f-4c5a-a783-f72cd6308dfb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesStockBasedCompensationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#BusinessBasisofPresentationandSignificantAccountingPoliciesStockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/BusinessBasisofPresentationandSignificantAccountingPoliciesStockBasedCompensationDetails" xlink:type="extended" id="ifac6b3a4c7bf4390b550ffbfc4c4668a_BusinessBasisofPresentationandSignificantAccountingPoliciesStockBasedCompensationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_53cf4d38-c07a-490a-b609-26358394cfd3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_53cf4d38-c07a-490a-b609-26358394cfd3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation_c9a9c058-ca52-4167-87ca-56af19a61d04" xlink:href="mtz-20221231.xsd#mtz_SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:to="loc_mtz_SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation_c9a9c058-ca52-4167-87ca-56af19a61d04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_ea43e555-9492-470f-94d8-d6b2ba4a44e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_ea43e555-9492-470f-94d8-d6b2ba4a44e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_ba3360f2-11a7-4333-b73d-4d8f35d250bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_ba3360f2-11a7-4333-b73d-4d8f35d250bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0252d054-6e70-415a-a957-14683c427700" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79dfb68b-6be6-4a3a-8d86-227d54638806" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0252d054-6e70-415a-a957-14683c427700" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e459a0e5-3fdb-4563-b454-4f2a24e219f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0252d054-6e70-415a-a957-14683c427700" xlink:to="loc_us-gaap_AwardTypeAxis_e459a0e5-3fdb-4563-b454-4f2a24e219f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e459a0e5-3fdb-4563-b454-4f2a24e219f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e459a0e5-3fdb-4563-b454-4f2a24e219f1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e459a0e5-3fdb-4563-b454-4f2a24e219f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_315c6e22-ba2c-41f3-83a5-b98e9a450404" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e459a0e5-3fdb-4563-b454-4f2a24e219f1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_315c6e22-ba2c-41f3-83a5-b98e9a450404" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_d41438d5-13d0-41d3-abc8-4edc39487da3" xlink:href="mtz-20221231.xsd#mtz_RestrictedStockAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_315c6e22-ba2c-41f3-83a5-b98e9a450404" xlink:to="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_d41438d5-13d0-41d3-abc8-4edc39487da3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_0a521238-bee9-4172-a8fb-5ecb81160810" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_315c6e22-ba2c-41f3-83a5-b98e9a450404" xlink:to="loc_us-gaap_EmployeeStockMember_0a521238-bee9-4172-a8fb-5ecb81160810" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#EarningsPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended" id="ic52741b7d22d48eb933a132be0d93507_EarningsPerShareNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7d5068f3-a7ee-4772-bf06-d7e2af22e930" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7d5068f3-a7ee-4772-bf06-d7e2af22e930" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c956145d-7012-49a6-b365-16591f466d56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c956145d-7012-49a6-b365-16591f466d56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_1aedee9a-83f2-41f1-bdad-64c6cb4d3066" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_1aedee9a-83f2-41f1-bdad-64c6cb4d3066" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_cb721414-81c0-4f95-8615-377e768262b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_cb721414-81c0-4f95-8615-377e768262b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EffectOfRepurchasesOnWeightedAverageSharesOutstandingDecrease_1da4c557-0917-4a3b-8cba-260ec7f5a021" xlink:href="mtz-20221231.xsd#mtz_EffectOfRepurchasesOnWeightedAverageSharesOutstandingDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_mtz_EffectOfRepurchasesOnWeightedAverageSharesOutstandingDecrease_1da4c557-0917-4a3b-8cba-260ec7f5a021" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_f1a86cbd-1d59-4748-8f41-5ae866a086c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_f1a86cbd-1d59-4748-8f41-5ae866a086c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessAcquisitionEquityInterestIssuedOrIssuableIncreaseDecreaseInNumberOfShares_a42014df-b651-4768-abad-44798fb1255d" xlink:href="mtz-20221231.xsd#mtz_BusinessAcquisitionEquityInterestIssuedOrIssuableIncreaseDecreaseInNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_mtz_BusinessAcquisitionEquityInterestIssuedOrIssuableIncreaseDecreaseInNumberOfShares_a42014df-b651-4768-abad-44798fb1255d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_dcdd537e-1957-48ac-9bc0-dc86b6aba0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_c28265d9-5f10-4b6d-b2ba-1d4392b02adf" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_dcdd537e-1957-48ac-9bc0-dc86b6aba0a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5ed73dce-328d-4e9a-805f-d979295db7c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_dcdd537e-1957-48ac-9bc0-dc86b6aba0a1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5ed73dce-328d-4e9a-805f-d979295db7c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5ed73dce-328d-4e9a-805f-d979295db7c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5ed73dce-328d-4e9a-805f-d979295db7c5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5ed73dce-328d-4e9a-805f-d979295db7c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0661aaba-3736-4a6d-9dce-ff23b12d0fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5ed73dce-328d-4e9a-805f-d979295db7c5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0661aaba-3736-4a6d-9dce-ff23b12d0fb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_55978c81-4cc1-4693-affa-f7bd7158ec35" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0661aaba-3736-4a6d-9dce-ff23b12d0fb1" xlink:to="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_55978c81-4cc1-4693-affa-f7bd7158ec35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsMember_07061d2d-13d8-42c9-aaeb-e7d8dac16436" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0661aaba-3736-4a6d-9dce-ff23b12d0fb1" xlink:to="loc_mtz_A2022AcquisitionsMember_07061d2d-13d8-42c9-aaeb-e7d8dac16436" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_b27d912c-1a3b-4926-83ae-b472cb82e4f4" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0661aaba-3736-4a6d-9dce-ff23b12d0fb1" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_b27d912c-1a3b-4926-83ae-b472cb82e4f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_60f0398e-4cb1-4bf4-96b3-f672d25c9f25" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_dcdd537e-1957-48ac-9bc0-dc86b6aba0a1" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_60f0398e-4cb1-4bf4-96b3-f672d25c9f25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_60f0398e-4cb1-4bf4-96b3-f672d25c9f25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_60f0398e-4cb1-4bf4-96b3-f672d25c9f25" xlink:to="loc_us-gaap_RelatedPartyDomain_60f0398e-4cb1-4bf4-96b3-f672d25c9f25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_aaf06e3f-9713-490a-a759-65270ee50cfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_60f0398e-4cb1-4bf4-96b3-f672d25c9f25" xlink:to="loc_us-gaap_RelatedPartyDomain_aaf06e3f-9713-490a-a759-65270ee50cfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FormerOwnerOfAcquiredBusinessMember_54336998-5424-4db3-be3b-bb42d889aa80" xlink:href="mtz-20221231.xsd#mtz_FormerOwnerOfAcquiredBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_aaf06e3f-9713-490a-a759-65270ee50cfb" xlink:to="loc_mtz_FormerOwnerOfAcquiredBusinessMember_54336998-5424-4db3-be3b-bb42d889aa80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ead7e405-1f49-4e5a-b80c-fef673a49af0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_dcdd537e-1957-48ac-9bc0-dc86b6aba0a1" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ead7e405-1f49-4e5a-b80c-fef673a49af0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ead7e405-1f49-4e5a-b80c-fef673a49af0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ead7e405-1f49-4e5a-b80c-fef673a49af0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ead7e405-1f49-4e5a-b80c-fef673a49af0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7f1ccf9f-0c5e-4914-b277-bf8e12b71378" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ead7e405-1f49-4e5a-b80c-fef673a49af0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7f1ccf9f-0c5e-4914-b277-bf8e12b71378" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_173d68b5-1371-4cfd-9fe2-cc96c0bf4da3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7f1ccf9f-0c5e-4914-b277-bf8e12b71378" xlink:to="loc_us-gaap_WarrantMember_173d68b5-1371-4cfd-9fe2-cc96c0bf4da3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofGoodwillbySegmentDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofGoodwillbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofGoodwillbySegmentDetails" xlink:type="extended" id="i2183a23a8482460d8da6c82b7c9e3140_AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofGoodwillbySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_99831e20-0e95-4ce7-95a2-68bb8f160141" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_GoodwillGross_99831e20-0e95-4ce7-95a2-68bb8f160141" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_23060707-8489-41bb-bc92-b7a907fa4b52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_23060707-8489-41bb-bc92-b7a907fa4b52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_446c2098-dbd7-4872-bcf0-54aca506ba4b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_Goodwill_446c2098-dbd7-4872-bcf0-54aca506ba4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_faf04025-dac3-45b1-9b21-433a203e5259" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_GoodwillRollForward_faf04025-dac3-45b1-9b21-433a203e5259" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_efebc8ff-8816-4992-a41a-140aaacddaad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_c9c7bfa5-598e-425d-8874-8b534f973904" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_faf04025-dac3-45b1-9b21-433a203e5259" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_c9c7bfa5-598e-425d-8874-8b534f973904" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_d983bbe8-dbd0-47ed-ba9d-d6b0c4721108" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_faf04025-dac3-45b1-9b21-433a203e5259" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_d983bbe8-dbd0-47ed-ba9d-d6b0c4721108" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_00642a21-2dd1-4bf0-b896-fb2802e1df0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_faf04025-dac3-45b1-9b21-433a203e5259" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_00642a21-2dd1-4bf0-b896-fb2802e1df0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_1de54d2b-b451-48fc-b6c8-1a1969c61d3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPeriodIncreaseDecrease_51f96a35-f2a1-431e-8984-196f7662d987" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_GoodwillPeriodIncreaseDecrease_51f96a35-f2a1-431e-8984-196f7662d987" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_dffa98e9-f914-4423-a5c3-639f03f0f6c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_211048f1-4bfe-4980-baef-bf1ef2409fe6" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_dffa98e9-f914-4423-a5c3-639f03f0f6c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6201d5fb-22e8-4556-9829-5d7f760499db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_dffa98e9-f914-4423-a5c3-639f03f0f6c4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6201d5fb-22e8-4556-9829-5d7f760499db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6201d5fb-22e8-4556-9829-5d7f760499db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6201d5fb-22e8-4556-9829-5d7f760499db" xlink:to="loc_us-gaap_SegmentDomain_6201d5fb-22e8-4556-9829-5d7f760499db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6201d5fb-22e8-4556-9829-5d7f760499db" xlink:to="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_e55b15ec-4317-413e-a7ac-77f2373cd48a" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:to="loc_mtz_CommunicationsMember_e55b15ec-4317-413e-a7ac-77f2373cd48a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_08abf88f-11a1-40fa-bf3a-cfc7e5d0431e" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_08abf88f-11a1-40fa-bf3a-cfc7e5d0431e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_e21a6bcd-074c-48d1-85d9-71fb69acd69a" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:to="loc_mtz_OilAndGasSegmentMember_e21a6bcd-074c-48d1-85d9-71fb69acd69a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_a07646fc-3188-4826-9a40-6b4df07918a9" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:to="loc_mtz_PowerDeliveryMember_a07646fc-3188-4826-9a40-6b4df07918a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsSegmentMember_ee756038-8169-4ce8-921c-02211289fba7" xlink:href="mtz-20221231.xsd#mtz_CommunicationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_96ba6b26-487a-4ece-9e18-8e27fbd8835b" xlink:to="loc_mtz_CommunicationsSegmentMember_ee756038-8169-4ce8-921c-02211289fba7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_fd477d0a-31f8-4a8a-bf5a-4b7faae62fac" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_57373f41-031e-471d-ad3b-37670c201218" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_dffa98e9-f914-4423-a5c3-639f03f0f6c4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_57373f41-031e-471d-ad3b-37670c201218" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_57373f41-031e-471d-ad3b-37670c201218_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_57373f41-031e-471d-ad3b-37670c201218" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_57373f41-031e-471d-ad3b-37670c201218_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7ddedc76-139c-465b-8838-52b1f176bbb3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_57373f41-031e-471d-ad3b-37670c201218" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7ddedc76-139c-465b-8838-52b1f176bbb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_8719d101-3c6b-4cf7-aab8-b75db5df3e42" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7ddedc76-139c-465b-8838-52b1f176bbb3" xlink:to="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_8719d101-3c6b-4cf7-aab8-b75db5df3e42" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofOtherIntangibleAssetsDetails" xlink:type="extended" id="i17fd2324217741ffbe206098ac3d5d7c_AcquisitionsGoodwillandOtherIntangibleAssetsNetRollforwardofOtherIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:href="mtz-20221231.xsd#mtz_IntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_9f290634-7483-43aa-a472-d52f802f2cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_9f290634-7483-43aa-a472-d52f802f2cbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_60e2c656-a7f5-4bc0-a8de-29855b2b5431" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_60e2c656-a7f5-4bc0-a8de-29855b2b5431" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:href="mtz-20221231.xsd#mtz_IntangibleAssetsExcludingGoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1699b2c3-820a-49e6-aee9-aca4cbc74299" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1699b2c3-820a-49e6-aee9-aca4cbc74299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IntangibleAssetsAcquiredGrossExcludingGoodwill_97053f30-5600-4716-8ba2-ebb71161f48d" xlink:href="mtz-20221231.xsd#mtz_IntangibleAssetsAcquiredGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:to="loc_mtz_IntangibleAssetsAcquiredGrossExcludingGoodwill_97053f30-5600-4716-8ba2-ebb71161f48d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IntangibleAssetsExcludingGoodwillPurchaseAccountingAdjustments_d928e75c-dd6a-4926-b800-addef135c502" xlink:href="mtz-20221231.xsd#mtz_IntangibleAssetsExcludingGoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:to="loc_mtz_IntangibleAssetsExcludingGoodwillPurchaseAccountingAdjustments_d928e75c-dd6a-4926-b800-addef135c502" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments_24dd6fdc-0b83-4ed6-b5b4-6d085e6b5bc7" xlink:href="mtz-20221231.xsd#mtz_IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:to="loc_mtz_IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments_24dd6fdc-0b83-4ed6-b5b4-6d085e6b5bc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_11bd6d87-b4b2-4d5a-aabd-56058133c8f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsExcludingGoodwillRollForward_e0976223-93c2-4675-8b6b-d38fed131df2" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_11bd6d87-b4b2-4d5a-aabd-56058133c8f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c8751556-2d95-49bc-b65b-d066d2c24ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_232a71d2-c41c-4d40-be59-5705ca082309" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_232a71d2-c41c-4d40-be59-5705ca082309" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_eadd7378-ceee-4b61-a660-e9c2695df912" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_eadd7378-ceee-4b61-a660-e9c2695df912" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ScheduleOfIntangibleAssetsTable_ae39dce3-3b9c-45b7-b14c-7c0a4ea63cd1" xlink:href="mtz-20221231.xsd#mtz_ScheduleOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mtz_IntangibleAssetsLineItems_12227983-9936-48c2-8d10-ab4f478872e4" xlink:to="loc_mtz_ScheduleOfIntangibleAssetsTable_ae39dce3-3b9c-45b7-b14c-7c0a4ea63cd1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_ba2dabe4-59ae-4e25-94f5-f907844336e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_ScheduleOfIntangibleAssetsTable_ae39dce3-3b9c-45b7-b14c-7c0a4ea63cd1" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_ba2dabe4-59ae-4e25-94f5-f907844336e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_ba2dabe4-59ae-4e25-94f5-f907844336e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_ba2dabe4-59ae-4e25-94f5-f907844336e9" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_ba2dabe4-59ae-4e25-94f5-f907844336e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0404988d-9b99-43de-b0ff-95663c672730" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_ba2dabe4-59ae-4e25-94f5-f907844336e9" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0404988d-9b99-43de-b0ff-95663c672730" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_9cb5680a-7f91-4272-a91d-9521896a748e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0404988d-9b99-43de-b0ff-95663c672730" xlink:to="loc_us-gaap_TradeNamesMember_9cb5680a-7f91-4272-a91d-9521896a748e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_de493ca0-bfd1-44f8-9810-38472f6a6caa" xlink:href="mtz-20221231.xsd#mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_ScheduleOfIntangibleAssetsTable_ae39dce3-3b9c-45b7-b14c-7c0a4ea63cd1" xlink:to="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_de493ca0-bfd1-44f8-9810-38472f6a6caa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_de493ca0-bfd1-44f8-9810-38472f6a6caa_default" xlink:href="mtz-20221231.xsd#mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_de493ca0-bfd1-44f8-9810-38472f6a6caa" xlink:to="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_de493ca0-bfd1-44f8-9810-38472f6a6caa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_3284e913-9217-492c-9c75-42b26fdaef1d" xlink:href="mtz-20221231.xsd#mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_de493ca0-bfd1-44f8-9810-38472f6a6caa" xlink:to="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_3284e913-9217-492c-9c75-42b26fdaef1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_36c8aabc-147d-4fb6-aeb6-04b47a03be50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_3284e913-9217-492c-9c75-42b26fdaef1d" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_36c8aabc-147d-4fb6-aeb6-04b47a03be50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_eb307cbd-03ed-4f9c-9a8a-d602d7447e90" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_3284e913-9217-492c-9c75-42b26fdaef1d" xlink:to="loc_us-gaap_TradeNamesMember_eb307cbd-03ed-4f9c-9a8a-d602d7447e90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_4d60d267-2699-43f4-bc70-d6fdcb57e334" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain_3284e913-9217-492c-9c75-42b26fdaef1d" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_4d60d267-2699-43f4-bc70-d6fdcb57e334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c7391801-405f-4f5f-ab99-1f83faea54e8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mtz_ScheduleOfIntangibleAssetsTable_ae39dce3-3b9c-45b7-b14c-7c0a4ea63cd1" xlink:to="loc_srt_RangeAxis_c7391801-405f-4f5f-ab99-1f83faea54e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c7391801-405f-4f5f-ab99-1f83faea54e8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c7391801-405f-4f5f-ab99-1f83faea54e8" xlink:to="loc_srt_RangeMember_c7391801-405f-4f5f-ab99-1f83faea54e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_446d625d-f1aa-4a74-b1cf-f84c1c8ef5e5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c7391801-405f-4f5f-ab99-1f83faea54e8" xlink:to="loc_srt_RangeMember_446d625d-f1aa-4a74-b1cf-f84c1c8ef5e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_63917189-0294-4eb0-b9fd-3010e7fcae15" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_446d625d-f1aa-4a74-b1cf-f84c1c8ef5e5" xlink:to="loc_srt_WeightedAverageMember_63917189-0294-4eb0-b9fd-3010e7fcae15" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNetScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended" id="iaa51c74202e74827aaa266f843b9319b_AcquisitionsGoodwillandOtherIntangibleAssetsNetScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_cb03a559-19ee-46d9-ba53-cefa444f37d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_cb03a559-19ee-46d9-ba53-cefa444f37d0" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_94c90918-f4a3-427f-a37a-236be75d821a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_94c90918-f4a3-427f-a37a-236be75d821a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_f82e3d71-5c45-4e8a-8d2c-22a7badbb16a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_f82e3d71-5c45-4e8a-8d2c-22a7badbb16a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationConsiderationTransferredWarrants_ae7081a2-c1ae-464f-bbc7-e1193faf6839" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationConsiderationTransferredWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:to="loc_mtz_BusinessCombinationConsiderationTransferredWarrants_ae7081a2-c1ae-464f-bbc7-e1193faf6839" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_1df171c1-e1a1-4b33-9b36-13a5c5e88c0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_1df171c1-e1a1-4b33-9b36-13a5c5e88c0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_456ee521-1c66-442c-9007-982ec5eb9302" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_4841b0f7-da5a-4dd8-b539-62d9dbe0795f" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_456ee521-1c66-442c-9007-982ec5eb9302" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_cb03a559-19ee-46d9-ba53-cefa444f37d0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_af721f10-1f59-454e-b24a-71139ffe6213" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_af721f10-1f59-454e-b24a-71139ffe6213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_d6435989-2506-41d1-8de8-02d2c5869d98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_d6435989-2506-41d1-8de8-02d2c5869d98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_d1cfd08f-9d6d-4674-a85a-c99bbaede154" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_d1cfd08f-9d6d-4674-a85a-c99bbaede154" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermAssetsOperatingRightOfUseAssets_28879ac7-18d4-4872-8cb2-6b1134218180" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermAssetsOperatingRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermAssetsOperatingRightOfUseAssets_28879ac7-18d4-4872-8cb2-6b1134218180" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_18fde887-a026-4fd7-9585-e0136357710f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_18fde887-a026-4fd7-9585-e0136357710f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_c64a9984-7064-4488-9b27-186cdfa5a8ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_c64a9984-7064-4488-9b27-186cdfa5a8ff" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_aa947649-7add-4cb1-b4c9-bc04d8a82c17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_aa947649-7add-4cb1-b4c9-bc04d8a82c17" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesLongTermDebtIncludingLeaseObligations_ebad258f-c6b5-447f-bda1-18073195cce8" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesLongTermDebtIncludingLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesLongTermDebtIncludingLeaseObligations_ebad258f-c6b5-447f-bda1-18073195cce8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_e927ce71-0e60-4eb4-a150-ffa9e800da13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_e927ce71-0e60-4eb4-a150-ffa9e800da13" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_a01060a6-8f2c-4e89-905c-b6393a067f30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_a01060a6-8f2c-4e89-905c-b6393a067f30" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_26824186-4bc6-4882-9484-80719ad4eba2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_Goodwill_26824186-4bc6-4882-9484-80719ad4eba2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5519a729-cfce-44a2-a8cb-9ac3409df23d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5519a729-cfce-44a2-a8cb-9ac3409df23d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_8856a778-871b-4bd7-8296-9df389e39815" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_8856a778-871b-4bd7-8296-9df389e39815" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationBargainPurchaseGainRecognizedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag_6499d4af-c5ee-4e6d-b032-b43e3f3a8ead" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationBargainPurchaseGainRecognizedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_df829e8a-bfe5-4ec6-b588-59b3672bc630" xlink:to="loc_mtz_BusinessCombinationBargainPurchaseGainRecognizedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag_6499d4af-c5ee-4e6d-b032-b43e3f3a8ead" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_b4a17c18-a2d1-4288-8846-821775ea278c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_513a753f-c45c-4cba-be80-050463e50c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_cb03a559-19ee-46d9-ba53-cefa444f37d0" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_513a753f-c45c-4cba-be80-050463e50c8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_ccc3ccbd-e28a-41c9-8580-d090f1e03168" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_513a753f-c45c-4cba-be80-050463e50c8d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_ccc3ccbd-e28a-41c9-8580-d090f1e03168" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ccc3ccbd-e28a-41c9-8580-d090f1e03168_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ccc3ccbd-e28a-41c9-8580-d090f1e03168" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ccc3ccbd-e28a-41c9-8580-d090f1e03168_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e8a14fde-bd94-45a3-9f97-fe82684336f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ccc3ccbd-e28a-41c9-8580-d090f1e03168" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e8a14fde-bd94-45a3-9f97-fe82684336f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsMember_1ad3a9c1-b236-4df6-9606-92587967d7be" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e8a14fde-bd94-45a3-9f97-fe82684336f1" xlink:to="loc_mtz_A2022AcquisitionsMember_1ad3a9c1-b236-4df6-9606-92587967d7be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_d6ec32df-7cd1-4b8c-96be-ed53f8d3e60d" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2022AcquisitionsMember_1ad3a9c1-b236-4df6-9606-92587967d7be" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_d6ec32df-7cd1-4b8c-96be-ed53f8d3e60d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsAllOtherMember_0836bfb5-f882-4db1-9b65-977ad31152ed" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsAllOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2022AcquisitionsMember_1ad3a9c1-b236-4df6-9606-92587967d7be" xlink:to="loc_mtz_A2022AcquisitionsAllOtherMember_0836bfb5-f882-4db1-9b65-977ad31152ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_92272c06-622c-4b44-b69e-cb0eb24a3d92" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e8a14fde-bd94-45a3-9f97-fe82684336f1" xlink:to="loc_mtz_A2021AcquisitionsMember_92272c06-622c-4b44-b69e-cb0eb24a3d92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_7d52774f-013a-46fa-b584-907c2f6a3207" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2021AcquisitionsMember_92272c06-622c-4b44-b69e-cb0eb24a3d92" xlink:to="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_7d52774f-013a-46fa-b584-907c2f6a3207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsAllOtherMember_ccfddeac-61f9-48a1-bb75-114e2265cd7d" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsAllOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2021AcquisitionsMember_92272c06-622c-4b44-b69e-cb0eb24a3d92" xlink:to="loc_mtz_A2021AcquisitionsAllOtherMember_ccfddeac-61f9-48a1-bb75-114e2265cd7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_69dab3f5-761c-407f-a1f9-29cde743fb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_513a753f-c45c-4cba-be80-050463e50c8d" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_69dab3f5-761c-407f-a1f9-29cde743fb2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_69dab3f5-761c-407f-a1f9-29cde743fb2a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_69dab3f5-761c-407f-a1f9-29cde743fb2a" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_69dab3f5-761c-407f-a1f9-29cde743fb2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_331c5be6-146e-4e19-becf-deed1704ad33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_69dab3f5-761c-407f-a1f9-29cde743fb2a" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_331c5be6-146e-4e19-becf-deed1704ad33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ContingentConsiderationValueOfAdditionalPaymentsMember_501049db-0896-453c-a7bc-c45bf6121ad2" xlink:href="mtz-20221231.xsd#mtz_ContingentConsiderationValueOfAdditionalPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_331c5be6-146e-4e19-becf-deed1704ad33" xlink:to="loc_mtz_ContingentConsiderationValueOfAdditionalPaymentsMember_501049db-0896-453c-a7bc-c45bf6121ad2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2aca1a30-d752-48ae-bcc9-9e36c6e7e454" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_513a753f-c45c-4cba-be80-050463e50c8d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2aca1a30-d752-48ae-bcc9-9e36c6e7e454" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2aca1a30-d752-48ae-bcc9-9e36c6e7e454_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2aca1a30-d752-48ae-bcc9-9e36c6e7e454" xlink:to="loc_us-gaap_SegmentDomain_2aca1a30-d752-48ae-bcc9-9e36c6e7e454_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_aaa20802-3497-41ec-a012-b29b39d9346b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2aca1a30-d752-48ae-bcc9-9e36c6e7e454" xlink:to="loc_us-gaap_SegmentDomain_aaa20802-3497-41ec-a012-b29b39d9346b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_1f8a27a2-313f-4a30-a69c-37583cd95e51" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_aaa20802-3497-41ec-a012-b29b39d9346b" xlink:to="loc_mtz_PowerDeliveryMember_1f8a27a2-313f-4a30-a69c-37583cd95e51" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2022AcquisitionsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNet2022AcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2022AcquisitionsDetails" xlink:type="extended" id="ida32c5da221f45de854a2ed0c7f496e5_AcquisitionsGoodwillandOtherIntangibleAssetsNet2022AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_0e17fe52-716f-4a96-9782-34b57e99a5f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_0e17fe52-716f-4a96-9782-34b57e99a5f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_7a62d601-d942-4738-a802-174493254570" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_7a62d601-d942-4738-a802-174493254570" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9ece5da7-0053-4d65-b71a-3ef0d5325c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9ece5da7-0053-4d65-b71a-3ef0d5325c8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_1892a47f-95ce-4731-b568-948a97759126" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_1892a47f-95ce-4731-b568-948a97759126" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessAcquisitionEquityInterestIssuedNumberOfShares_47c51d9e-3b04-4c95-96ae-9fc32c68ea12" xlink:href="mtz-20221231.xsd#mtz_BusinessAcquisitionEquityInterestIssuedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_mtz_BusinessAcquisitionEquityInterestIssuedNumberOfShares_47c51d9e-3b04-4c95-96ae-9fc32c68ea12" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_a2216ef9-b36c-41ee-aa53-db8f79379ec5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_a2216ef9-b36c-41ee-aa53-db8f79379ec5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_5ea56654-53c8-4e4e-aca2-e4d57378545c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_5ea56654-53c8-4e4e-aca2-e4d57378545c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_9b7864ec-9ee0-4446-b1ff-796f845ee81b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_9b7864ec-9ee0-4446-b1ff-796f845ee81b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c3bac0c0-d7ac-42b5-af36-d1dc78f452e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c3bac0c0-d7ac-42b5-af36-d1dc78f452e8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_90a37045-f6fb-416c-a0e1-4ba6560185d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_90a37045-f6fb-416c-a0e1-4ba6560185d8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PaymentsForWarrantExercises_5c50e81c-3b28-46d4-87ba-bc6ee80d4b67" xlink:href="mtz-20221231.xsd#mtz_PaymentsForWarrantExercises"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_mtz_PaymentsForWarrantExercises_5c50e81c-3b28-46d4-87ba-bc6ee80d4b67" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_bc5cca2f-2bde-48d3-9dbd-b1e6bce5aa01" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_bc5cca2f-2bde-48d3-9dbd-b1e6bce5aa01" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_a7e0762c-b50e-4885-a21a-5633a731f662" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_a7e0762c-b50e-4885-a21a-5633a731f662" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_WarrantsAndCommonStockFairValueDisclosure_e91433ec-c318-4a1f-a2de-4c4080849e9e" xlink:href="mtz-20221231.xsd#mtz_WarrantsAndCommonStockFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_mtz_WarrantsAndCommonStockFairValueDisclosure_e91433ec-c318-4a1f-a2de-4c4080849e9e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_f5d51448-461d-4045-89bb-22341724934b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_f5d51448-461d-4045-89bb-22341724934b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_13a177ec-d3ae-43f9-8d6c-5de1ce3c27b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_13a177ec-d3ae-43f9-8d6c-5de1ce3c27b4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_cbdabe35-996d-4f4a-8583-c2439e81aee9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_cbdabe35-996d-4f4a-8583-c2439e81aee9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_31ab75ed-2d63-42a6-9dcc-19306c445add" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_31ab75ed-2d63-42a6-9dcc-19306c445add" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8507f26b-c581-4af0-b7c5-a7fa4ce23dbb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8507f26b-c581-4af0-b7c5-a7fa4ce23dbb" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_764e7fb0-e4cb-4647-979e-e14507649b24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_764e7fb0-e4cb-4647-979e-e14507649b24" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a366538-392c-4063-bbbc-68f7b3b96d70" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9ee8e43f-f291-4426-9b06-b71bf8bf5936" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9ee8e43f-f291-4426-9b06-b71bf8bf5936" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9ee8e43f-f291-4426-9b06-b71bf8bf5936_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9ee8e43f-f291-4426-9b06-b71bf8bf5936" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9ee8e43f-f291-4426-9b06-b71bf8bf5936_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a1580e6-00e3-4bec-99df-b2d8a501c8cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9ee8e43f-f291-4426-9b06-b71bf8bf5936" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a1580e6-00e3-4bec-99df-b2d8a501c8cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsMember_3583b180-acbe-46b0-9e1e-dd55e7962571" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a1580e6-00e3-4bec-99df-b2d8a501c8cc" xlink:to="loc_mtz_A2022AcquisitionsMember_3583b180-acbe-46b0-9e1e-dd55e7962571" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_a81924a5-3136-4067-abca-f64ae11d8e6e" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2022AcquisitionsMember_3583b180-acbe-46b0-9e1e-dd55e7962571" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_a81924a5-3136-4067-abca-f64ae11d8e6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsAllOtherMember_aaa7d03a-70c3-4c52-b78d-552149f54469" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsAllOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2022AcquisitionsMember_3583b180-acbe-46b0-9e1e-dd55e7962571" xlink:to="loc_mtz_A2022AcquisitionsAllOtherMember_aaa7d03a-70c3-4c52-b78d-552149f54469" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2abc76a-f483-43a6-a45c-7d5afea31a96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2abc76a-f483-43a6-a45c-7d5afea31a96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c2abc76a-f483-43a6-a45c-7d5afea31a96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2abc76a-f483-43a6-a45c-7d5afea31a96" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c2abc76a-f483-43a6-a45c-7d5afea31a96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2abc76a-f483-43a6-a45c-7d5afea31a96" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_f5f0c59c-671c-4956-a363-46d4689b58a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:to="loc_us-gaap_CustomerRelationshipsMember_f5f0c59c-671c-4956-a363-46d4689b58a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_ba49413c-d824-4282-9ebe-ed36dc110d93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:to="loc_us-gaap_TradeNamesMember_ba49413c-d824-4282-9ebe-ed36dc110d93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BacklogMember_5882b979-459e-4d93-b6a3-fbd1dd975232" xlink:href="mtz-20221231.xsd#mtz_BacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:to="loc_mtz_BacklogMember_5882b979-459e-4d93-b6a3-fbd1dd975232" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_TradeNamesAndCustomerRelationshipsMember_0c444347-8415-411f-a67f-a04aef678d95" xlink:href="mtz-20221231.xsd#mtz_TradeNamesAndCustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d6ab3e35-bd6c-405e-8671-5aac54bd7bc7" xlink:to="loc_mtz_TradeNamesAndCustomerRelationshipsMember_0c444347-8415-411f-a67f-a04aef678d95" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6a5bcdf9-fd63-4ac1-a61a-638174380a64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_DebtInstrumentAxis_6a5bcdf9-fd63-4ac1-a61a-638174380a64" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6a5bcdf9-fd63-4ac1-a61a-638174380a64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6a5bcdf9-fd63-4ac1-a61a-638174380a64" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6a5bcdf9-fd63-4ac1-a61a-638174380a64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f60a4b6c-3bc5-4289-9581-f4b5eb7e0f97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6a5bcdf9-fd63-4ac1-a61a-638174380a64" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f60a4b6c-3bc5-4289-9581-f4b5eb7e0f97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_f3130885-babb-4636-b1d0-6bdd02970c9d" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f60a4b6c-3bc5-4289-9581-f4b5eb7e0f97" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_f3130885-babb-4636-b1d0-6bdd02970c9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_36ad0929-51fc-4483-b5be-bb45c15c7338" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_36ad0929-51fc-4483-b5be-bb45c15c7338" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_36ad0929-51fc-4483-b5be-bb45c15c7338_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_36ad0929-51fc-4483-b5be-bb45c15c7338" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_36ad0929-51fc-4483-b5be-bb45c15c7338_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e5f284b1-f312-4c8e-a779-5b56369c61bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_36ad0929-51fc-4483-b5be-bb45c15c7338" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e5f284b1-f312-4c8e-a779-5b56369c61bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_e65dfc2e-9825-4ee8-86a7-9ccc6b1c14b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e5f284b1-f312-4c8e-a779-5b56369c61bc" xlink:to="loc_us-gaap_SeniorNotesMember_e65dfc2e-9825-4ee8-86a7-9ccc6b1c14b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5f854b4c-75b6-43ac-ade4-cb36ca8d7726" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_srt_RangeAxis_5f854b4c-75b6-43ac-ade4-cb36ca8d7726" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5f854b4c-75b6-43ac-ade4-cb36ca8d7726_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5f854b4c-75b6-43ac-ade4-cb36ca8d7726" xlink:to="loc_srt_RangeMember_5f854b4c-75b6-43ac-ade4-cb36ca8d7726_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_977bd680-42a1-4bea-834a-f055d2e3db80" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5f854b4c-75b6-43ac-ade4-cb36ca8d7726" xlink:to="loc_srt_RangeMember_977bd680-42a1-4bea-834a-f055d2e3db80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c9b9cbf0-4c13-4298-9e59-c9c02f69f1b4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_977bd680-42a1-4bea-834a-f055d2e3db80" xlink:to="loc_srt_MinimumMember_c9b9cbf0-4c13-4298-9e59-c9c02f69f1b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ac531aac-c746-4e1f-bbac-bb33764179b7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_977bd680-42a1-4bea-834a-f055d2e3db80" xlink:to="loc_srt_MaximumMember_ac531aac-c746-4e1f-bbac-bb33764179b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_5aa1cfb8-b750-47ad-a9d9-5068476bc099" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_72cd5c45-7c6f-44e5-ad4b-5145ed85c3b8" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_5aa1cfb8-b750-47ad-a9d9-5068476bc099" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_43262a3e-2398-4e5e-a5b7-1c04cd8436d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputExpectedTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5aa1cfb8-b750-47ad-a9d9-5068476bc099" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_43262a3e-2398-4e5e-a5b7-1c04cd8436d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_8d258b47-358b-4ef0-8e91-a6e00d470c78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_8d258b47-358b-4ef0-8e91-a6e00d470c78" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8d258b47-358b-4ef0-8e91-a6e00d470c78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8d258b47-358b-4ef0-8e91-a6e00d470c78" xlink:to="loc_us-gaap_ClassOfStockDomain_8d258b47-358b-4ef0-8e91-a6e00d470c78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_59078462-6c7a-491e-bba2-cfe68809d92a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8d258b47-358b-4ef0-8e91-a6e00d470c78" xlink:to="loc_us-gaap_ClassOfStockDomain_59078462-6c7a-491e-bba2-cfe68809d92a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_54fdeb60-6413-4e42-9cee-43cbee64788f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_59078462-6c7a-491e-bba2-cfe68809d92a" xlink:to="loc_us-gaap_CommonStockMember_54fdeb60-6413-4e42-9cee-43cbee64788f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_ccacf6a3-9c6f-4674-b601-50255729cbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8e8c7fae-c189-4541-ac30-447f892e05d1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_ccacf6a3-9c6f-4674-b601-50255729cbcc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_ccacf6a3-9c6f-4674-b601-50255729cbcc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ccacf6a3-9c6f-4674-b601-50255729cbcc" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_ccacf6a3-9c6f-4674-b601-50255729cbcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_528e0c2b-8e41-4f88-b62a-ede298406252" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ccacf6a3-9c6f-4674-b601-50255729cbcc" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_528e0c2b-8e41-4f88-b62a-ede298406252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_InfrastructureEnergyAlternativesIncWarrantsMember_325c00ee-ca0d-46a8-bc14-6f5fb65413b0" xlink:href="mtz-20221231.xsd#mtz_InfrastructureEnergyAlternativesIncWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_528e0c2b-8e41-4f88-b62a-ede298406252" xlink:to="loc_mtz_InfrastructureEnergyAlternativesIncWarrantsMember_325c00ee-ca0d-46a8-bc14-6f5fb65413b0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2021AcquisitionsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNet2021AcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2021AcquisitionsDetails" xlink:type="extended" id="icfdbc77393564b6d8385b6c55d6d83f2_AcquisitionsGoodwillandOtherIntangibleAssetsNet2021AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_1c238ed1-a219-4acf-a4af-aa4610b8520e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_1c238ed1-a219-4acf-a4af-aa4610b8520e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_8105636a-be3d-4fb2-8c46-b50488d54a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_8105636a-be3d-4fb2-8c46-b50488d54a9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_80747238-3dad-451a-9c3d-662433b40673" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_80747238-3dad-451a-9c3d-662433b40673" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_384420ad-a07c-43e3-9c07-20c54a436f74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_Goodwill_384420ad-a07c-43e3-9c07-20c54a436f74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_bdfada1d-ea38-4ba8-96e4-7f8bc0d19cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_bdfada1d-ea38-4ba8-96e4-7f8bc0d19cd7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_994a9983-5271-41d2-8c8f-975b8fffd73e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_994a9983-5271-41d2-8c8f-975b8fffd73e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_db451b61-3cb4-4f48-ba6a-c79873982a26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_db451b61-3cb4-4f48-ba6a-c79873982a26" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_70d8ae8a-b615-4413-a4a3-66b4a43875b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_70d8ae8a-b615-4413-a4a3-66b4a43875b1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_728b764c-08d2-4682-8ed1-9f193c94adb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_728b764c-08d2-4682-8ed1-9f193c94adb8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationsContingentConsiderationRealizedGainLoss_20010d04-159e-455a-8a44-edb7563ebe0a" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationsContingentConsiderationRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_mtz_BusinessCombinationsContingentConsiderationRealizedGainLoss_20010d04-159e-455a-8a44-edb7563ebe0a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_bfc34e38-7952-4c2c-a61a-0688d3b41c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_bfc34e38-7952-4c2c-a61a-0688d3b41c4b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_117a14f1-9140-4f49-82eb-05333c58396d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_117a14f1-9140-4f49-82eb-05333c58396d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationsContingentConsiderationUnrealizedGainLoss_31a6f616-43c5-4d4b-8bc8-c959fdeb67ac" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationsContingentConsiderationUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_mtz_BusinessCombinationsContingentConsiderationUnrealizedGainLoss_31a6f616-43c5-4d4b-8bc8-c959fdeb67ac" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a1e3f32f-ae71-4f5d-a150-224df904b05c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a1e3f32f-ae71-4f5d-a150-224df904b05c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0fe04163-2d7a-42e1-8128-6d79b979603e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0fe04163-2d7a-42e1-8128-6d79b979603e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_fd3f115e-070a-4fb9-b321-beb359b151db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_fd3f115e-070a-4fb9-b321-beb359b151db" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_026842c8-66db-48fa-a646-a0d77cc93ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_026842c8-66db-48fa-a646-a0d77cc93ff7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_28aa70e9-e5c4-4b11-b2f0-b1af736bd16c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_28aa70e9-e5c4-4b11-b2f0-b1af736bd16c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_584dfa55-277b-44fb-a384-464e9d5b9858" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_584dfa55-277b-44fb-a384-464e9d5b9858" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_54f38e24-92d2-4b5b-92aa-ef7107e32031" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7d80ec7c-98ea-41df-a62c-f3460756a1ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7d80ec7c-98ea-41df-a62c-f3460756a1ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d80ec7c-98ea-41df-a62c-f3460756a1ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7d80ec7c-98ea-41df-a62c-f3460756a1ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d80ec7c-98ea-41df-a62c-f3460756a1ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1421ce9b-332e-43b4-93a0-1fb1b6a5c45c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7d80ec7c-98ea-41df-a62c-f3460756a1ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1421ce9b-332e-43b4-93a0-1fb1b6a5c45c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_75914e20-75a5-447b-964b-214a83668088" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1421ce9b-332e-43b4-93a0-1fb1b6a5c45c" xlink:to="loc_mtz_A2021AcquisitionsMember_75914e20-75a5-447b-964b-214a83668088" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_570b1313-e41e-41b7-adef-ff0db1bc554d" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2021AcquisitionsMember_75914e20-75a5-447b-964b-214a83668088" xlink:to="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember_570b1313-e41e-41b7-adef-ff0db1bc554d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsAllOtherMember_fe29bca9-c397-4ea5-b488-1edfa231b810" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsAllOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2021AcquisitionsMember_75914e20-75a5-447b-964b-214a83668088" xlink:to="loc_mtz_A2021AcquisitionsAllOtherMember_fe29bca9-c397-4ea5-b488-1edfa231b810" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsAllOtherINTRENMember_03aa207b-6957-49c8-ba8b-14505bb47cf1" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsAllOtherINTRENMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_A2021AcquisitionsMember_75914e20-75a5-447b-964b-214a83668088" xlink:to="loc_mtz_A2021AcquisitionsAllOtherINTRENMember_03aa207b-6957-49c8-ba8b-14505bb47cf1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ce8c3a98-76f5-4479-95f8-3859738b1613" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ce8c3a98-76f5-4479-95f8-3859738b1613" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ce8c3a98-76f5-4479-95f8-3859738b1613_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ce8c3a98-76f5-4479-95f8-3859738b1613" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ce8c3a98-76f5-4479-95f8-3859738b1613_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9b82883a-698d-496d-8a17-37f0bb88901f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ce8c3a98-76f5-4479-95f8-3859738b1613" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9b82883a-698d-496d-8a17-37f0bb88901f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_c90e7977-814a-4326-96bf-a818ab208f22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9b82883a-698d-496d-8a17-37f0bb88901f" xlink:to="loc_us-gaap_CustomerRelationshipsMember_c90e7977-814a-4326-96bf-a818ab208f22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_bfa82048-46ae-4f28-9b7d-7e981e21bb88" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9b82883a-698d-496d-8a17-37f0bb88901f" xlink:to="loc_us-gaap_TradeNamesMember_bfa82048-46ae-4f28-9b7d-7e981e21bb88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CustomerRelationshipsAndTradeNamesMember_8c4eb445-6391-4c3a-8474-54160da1c069" xlink:href="mtz-20221231.xsd#mtz_CustomerRelationshipsAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9b82883a-698d-496d-8a17-37f0bb88901f" xlink:to="loc_mtz_CustomerRelationshipsAndTradeNamesMember_8c4eb445-6391-4c3a-8474-54160da1c069" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4cf34787-3304-4bc1-821a-88785fcc9a63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4cf34787-3304-4bc1-821a-88785fcc9a63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4cf34787-3304-4bc1-821a-88785fcc9a63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4cf34787-3304-4bc1-821a-88785fcc9a63" xlink:to="loc_us-gaap_SegmentDomain_4cf34787-3304-4bc1-821a-88785fcc9a63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_29d224f6-2954-47f0-be96-64bdf83d733c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4cf34787-3304-4bc1-821a-88785fcc9a63" xlink:to="loc_us-gaap_SegmentDomain_29d224f6-2954-47f0-be96-64bdf83d733c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_716bb268-beae-415e-8d34-2e50c3d7fe7f" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_29d224f6-2954-47f0-be96-64bdf83d733c" xlink:to="loc_mtz_PowerDeliveryMember_716bb268-beae-415e-8d34-2e50c3d7fe7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_07981d68-f231-46c7-b456-f94762f6c736" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_07981d68-f231-46c7-b456-f94762f6c736" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_07981d68-f231-46c7-b456-f94762f6c736_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_07981d68-f231-46c7-b456-f94762f6c736" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_07981d68-f231-46c7-b456-f94762f6c736_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_ece2b118-95d3-486e-afbd-6651d8daeccf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_07981d68-f231-46c7-b456-f94762f6c736" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_ece2b118-95d3-486e-afbd-6651d8daeccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ContingentConsiderationValueOfAdditionalPaymentsMember_b8304bc8-a7ec-4446-9f61-29b89cd875b6" xlink:href="mtz-20221231.xsd#mtz_ContingentConsiderationValueOfAdditionalPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_ece2b118-95d3-486e-afbd-6651d8daeccf" xlink:to="loc_mtz_ContingentConsiderationValueOfAdditionalPaymentsMember_b8304bc8-a7ec-4446-9f61-29b89cd875b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ContingentConsiderationCollectionsFromAcquiredReceivablesMember_ccfe5f84-0e7b-4f09-9962-faef45b16b76" xlink:href="mtz-20221231.xsd#mtz_ContingentConsiderationCollectionsFromAcquiredReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_ece2b118-95d3-486e-afbd-6651d8daeccf" xlink:to="loc_mtz_ContingentConsiderationCollectionsFromAcquiredReceivablesMember_ccfe5f84-0e7b-4f09-9962-faef45b16b76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b69f5507-52a7-456d-b6e3-303c7f399dce" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_srt_RangeAxis_b69f5507-52a7-456d-b6e3-303c7f399dce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b69f5507-52a7-456d-b6e3-303c7f399dce_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b69f5507-52a7-456d-b6e3-303c7f399dce" xlink:to="loc_srt_RangeMember_b69f5507-52a7-456d-b6e3-303c7f399dce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_51132f4c-e45f-4d89-a383-b2a44d356142" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b69f5507-52a7-456d-b6e3-303c7f399dce" xlink:to="loc_srt_RangeMember_51132f4c-e45f-4d89-a383-b2a44d356142" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_49fdf6ef-dc9f-4f71-898e-1359cdb2efae" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_51132f4c-e45f-4d89-a383-b2a44d356142" xlink:to="loc_srt_MinimumMember_49fdf6ef-dc9f-4f71-898e-1359cdb2efae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_cfbd781e-c5aa-4d3c-b01f-cb8e9e15b11e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_51132f4c-e45f-4d89-a383-b2a44d356142" xlink:to="loc_srt_MaximumMember_cfbd781e-c5aa-4d3c-b01f-cb8e9e15b11e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_4506b83b-059c-4ca0-9dac-2198f82770bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d37af496-8dee-4b33-95dd-d1e4e20d8070" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_4506b83b-059c-4ca0-9dac-2198f82770bf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_4506b83b-059c-4ca0-9dac-2198f82770bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_4506b83b-059c-4ca0-9dac-2198f82770bf" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_4506b83b-059c-4ca0-9dac-2198f82770bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_a148002b-6bb9-48cd-9c47-ff33805ff0fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_4506b83b-059c-4ca0-9dac-2198f82770bf" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_a148002b-6bb9-48cd-9c47-ff33805ff0fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_5404da73-8155-448e-9704-6c3fb604e910" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputExpectedTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_a148002b-6bb9-48cd-9c47-ff33805ff0fb" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_5404da73-8155-448e-9704-6c3fb604e910" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2020AcquisitionDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNet2020AcquisitionDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNet2020AcquisitionDetails" xlink:type="extended" id="i7dfd4806bd384c97ac39f2e273723551_AcquisitionsGoodwillandOtherIntangibleAssetsNet2020AcquisitionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_49d070f7-dbb6-432a-9333-eb3465cd6260" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_49d070f7-dbb6-432a-9333-eb3465cd6260" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_0daccc72-a60d-4c06-91a0-cf559889e164" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_0daccc72-a60d-4c06-91a0-cf559889e164" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_5ba7e37b-9e42-4c7f-ba02-2167397e9794" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_5ba7e37b-9e42-4c7f-ba02-2167397e9794" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_1e48ac5a-a47b-4333-9fc5-05dc669200da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_1e48ac5a-a47b-4333-9fc5-05dc669200da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_901927cb-e2d1-4d3c-a65a-f0f5797f99b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_901927cb-e2d1-4d3c-a65a-f0f5797f99b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_388b9736-2f92-4315-9b41-70b70bc400d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_388b9736-2f92-4315-9b41-70b70bc400d1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_63ae5f2e-5b00-42f8-b203-c4b2acb358ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_63ae5f2e-5b00-42f8-b203-c4b2acb358ca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_996499b2-155e-4565-9bf6-e325439be44d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_afd13fce-0e94-4e1e-99de-df6840ca44b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_afd13fce-0e94-4e1e-99de-df6840ca44b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_afd13fce-0e94-4e1e-99de-df6840ca44b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_afd13fce-0e94-4e1e-99de-df6840ca44b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_afd13fce-0e94-4e1e-99de-df6840ca44b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f2e75f37-fc4c-4048-943a-99c3dded67c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_afd13fce-0e94-4e1e-99de-df6840ca44b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f2e75f37-fc4c-4048-943a-99c3dded67c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2020AcquisitionsMember_43238b7a-9ead-4581-ace4-c412bd9fea6f" xlink:href="mtz-20221231.xsd#mtz_A2020AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f2e75f37-fc4c-4048-943a-99c3dded67c4" xlink:to="loc_mtz_A2020AcquisitionsMember_43238b7a-9ead-4581-ace4-c412bd9fea6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4f6f1169-3c15-41db-85ea-6549cc7cf489" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4f6f1169-3c15-41db-85ea-6549cc7cf489" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4f6f1169-3c15-41db-85ea-6549cc7cf489_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4f6f1169-3c15-41db-85ea-6549cc7cf489" xlink:to="loc_us-gaap_SegmentDomain_4f6f1169-3c15-41db-85ea-6549cc7cf489_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4f6f1169-3c15-41db-85ea-6549cc7cf489" xlink:to="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_6fff2a92-ea65-4838-90cf-0bbd9d3eb0d3" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_6fff2a92-ea65-4838-90cf-0bbd9d3eb0d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsAndElectricalTransmissionMember_7e994c4c-4274-4d61-a7e0-19e67b239fdb" xlink:href="mtz-20221231.xsd#mtz_CommunicationsAndElectricalTransmissionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:to="loc_mtz_CommunicationsAndElectricalTransmissionMember_7e994c4c-4274-4d61-a7e0-19e67b239fdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_955e0546-f313-4a89-88a9-8e17b4835237" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:to="loc_mtz_CommunicationsMember_955e0546-f313-4a89-88a9-8e17b4835237" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_89e48a48-a350-4458-bc12-8ef05b25fc48" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3c3bc24a-130a-4d7f-be64-f9e06b14b087" xlink:to="loc_mtz_PowerDeliveryMember_89e48a48-a350-4458-bc12-8ef05b25fc48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_798824d4-b5cd-4fe0-9987-07e20f07535b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_798824d4-b5cd-4fe0-9987-07e20f07535b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_798824d4-b5cd-4fe0-9987-07e20f07535b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_798824d4-b5cd-4fe0-9987-07e20f07535b" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_798824d4-b5cd-4fe0-9987-07e20f07535b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_c00ec761-4d7d-493c-88f4-d751b1688290" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_798824d4-b5cd-4fe0-9987-07e20f07535b" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_c00ec761-4d7d-493c-88f4-d751b1688290" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_InstallToHomeMember_f00be82a-75de-49e8-9fa2-205e32622bdb" xlink:href="mtz-20221231.xsd#mtz_InstallToHomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_c00ec761-4d7d-493c-88f4-d751b1688290" xlink:to="loc_mtz_InstallToHomeMember_f00be82a-75de-49e8-9fa2-205e32622bdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_dcfb2d9c-4cf9-49ec-9b43-a04282838475" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_srt_StatementScenarioAxis_dcfb2d9c-4cf9-49ec-9b43-a04282838475" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_dcfb2d9c-4cf9-49ec-9b43-a04282838475_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_dcfb2d9c-4cf9-49ec-9b43-a04282838475" xlink:to="loc_srt_ScenarioUnspecifiedDomain_dcfb2d9c-4cf9-49ec-9b43-a04282838475_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_6859f327-a7e3-4423-ad7d-f64bee0f89eb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_dcfb2d9c-4cf9-49ec-9b43-a04282838475" xlink:to="loc_srt_ScenarioUnspecifiedDomain_6859f327-a7e3-4423-ad7d-f64bee0f89eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_538d70cb-6033-43ac-8721-f414e22f0e25" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_6859f327-a7e3-4423-ad7d-f64bee0f89eb" xlink:to="loc_srt_ScenarioForecastMember_538d70cb-6033-43ac-8721-f414e22f0e25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c735d531-6470-409c-ac9b-6e880542234b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_srt_RangeAxis_c735d531-6470-409c-ac9b-6e880542234b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c735d531-6470-409c-ac9b-6e880542234b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c735d531-6470-409c-ac9b-6e880542234b" xlink:to="loc_srt_RangeMember_c735d531-6470-409c-ac9b-6e880542234b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e756f3ea-64fc-4ce0-a9c5-9f7d14e9ec4b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c735d531-6470-409c-ac9b-6e880542234b" xlink:to="loc_srt_RangeMember_e756f3ea-64fc-4ce0-a9c5-9f7d14e9ec4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ac66edce-b722-4f57-b342-9dbe9ae5efff" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e756f3ea-64fc-4ce0-a9c5-9f7d14e9ec4b" xlink:to="loc_srt_MaximumMember_ac66edce-b722-4f57-b342-9dbe9ae5efff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_ee192cbf-56af-4550-9471-2d825a552047" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3769b7b-edf7-4b1b-80c3-d6ec200db47e" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_ee192cbf-56af-4550-9471-2d825a552047" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_ee192cbf-56af-4550-9471-2d825a552047_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_ee192cbf-56af-4550-9471-2d825a552047" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_ee192cbf-56af-4550-9471-2d825a552047_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_afb483fe-1c6d-40cf-b955-1a831a8698f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_ee192cbf-56af-4550-9471-2d825a552047" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_afb483fe-1c6d-40cf-b955-1a831a8698f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_a05ee9e4-ac29-4ec7-9bb6-116d36fa27d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputExpectedTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_afb483fe-1c6d-40cf-b955-1a831a8698f3" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_a05ee9e4-ac29-4ec7-9bb6-116d36fa27d2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetProFormaFinancialInformationandAcquisitionResultsandIntegrationCostsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AcquisitionsGoodwillandOtherIntangibleAssetsNetProFormaFinancialInformationandAcquisitionResultsandIntegrationCostsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AcquisitionsGoodwillandOtherIntangibleAssetsNetProFormaFinancialInformationandAcquisitionResultsandIntegrationCostsDetails" xlink:type="extended" id="ie61d48fd81474803aa9abeff091aa6f9_AcquisitionsGoodwillandOtherIntangibleAssetsNetProFormaFinancialInformationandAcquisitionResultsandIntegrationCostsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_44c74251-4a76-433e-8101-ae896cfdad0f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_44c74251-4a76-433e-8101-ae896cfdad0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_b8ba3d0f-893c-4a50-af03-d50b8495ee25" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_b8ba3d0f-893c-4a50-af03-d50b8495ee25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_6328a9e6-f5b8-4ef5-bdb3-d1bd7bc1c6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_6328a9e6-f5b8-4ef5-bdb3-d1bd7bc1c6d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_e2d38e79-ead3-421d-beb4-ee04724a5e33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_e2d38e79-ead3-421d-beb4-ee04724a5e33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_2cde34fa-0520-4f81-aaa4-7ebaee9c063b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_2cde34fa-0520-4f81-aaa4-7ebaee9c063b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BusinessCombinationIntegrationRelatedLiabilities_c99bc9f7-9721-4931-9313-717c171a484d" xlink:href="mtz-20221231.xsd#mtz_BusinessCombinationIntegrationRelatedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_mtz_BusinessCombinationIntegrationRelatedLiabilities_c99bc9f7-9721-4931-9313-717c171a484d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_b2195432-fbac-49eb-b3bb-080b940548e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8f4aa8f9-0992-4c25-8123-50343b022f22" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_b2195432-fbac-49eb-b3bb-080b940548e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_b2195432-fbac-49eb-b3bb-080b940548e3" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6d3aaa03-bbc0-4627-bdd0-9bc881cb1c58" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsAllOtherMember_968a8b52-60a1-4c45-85d0-86f73706be60" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsAllOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2022AcquisitionsAllOtherMember_968a8b52-60a1-4c45-85d0-86f73706be60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsAllOtherINTRENMember_4d889193-db42-4341-9156-e2619c2c2b7a" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsAllOtherINTRENMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2021AcquisitionsAllOtherINTRENMember_4d889193-db42-4341-9156-e2619c2c2b7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncAndINTRENMember_e08ed1ce-26fc-4a6e-b95a-38ccbe8e8d21" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsHenkelsMcCoyGroupIncAndINTRENMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2021AcquisitionsHenkelsMcCoyGroupIncAndINTRENMember_e08ed1ce-26fc-4a6e-b95a-38ccbe8e8d21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021And2022AcquisitionsMember_0268911a-6b8f-4917-a1cd-f5003968ae7c" xlink:href="mtz-20221231.xsd#mtz_A2021And2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2021And2022AcquisitionsMember_0268911a-6b8f-4917-a1cd-f5003968ae7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_131287e4-b24d-409d-b579-8a575f69930b" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_131287e4-b24d-409d-b579-8a575f69930b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_330b632f-9222-4cd2-9af3-43c7c3a183ea" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a09a036f-bd1a-4de6-8987-fd3c03592ab6" xlink:to="loc_mtz_A2021AcquisitionsMember_330b632f-9222-4cd2-9af3-43c7c3a183ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7ab5761b-69d1-4fe8-a981-168eaf70d0cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_b2195432-fbac-49eb-b3bb-080b940548e3" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_7ab5761b-69d1-4fe8-a981-168eaf70d0cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7ab5761b-69d1-4fe8-a981-168eaf70d0cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7ab5761b-69d1-4fe8-a981-168eaf70d0cb" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7ab5761b-69d1-4fe8-a981-168eaf70d0cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_77200691-3cbd-427c-b4ec-761294eb3370" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7ab5761b-69d1-4fe8-a981-168eaf70d0cb" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_77200691-3cbd-427c-b4ec-761294eb3370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_c4504e98-b80a-4bb0-99e8-ce338d70cfc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_77200691-3cbd-427c-b4ec-761294eb3370" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_c4504e98-b80a-4bb0-99e8-ce338d70cfc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_c7b71c9a-1f85-4ab0-a9e4-206ec44e8ecf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_77200691-3cbd-427c-b4ec-761294eb3370" xlink:to="loc_us-gaap_CostOfSalesMember_c7b71c9a-1f85-4ab0-a9e4-206ec44e8ecf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenseMember_f03eebc5-3a28-490a-a3cb-8075ad65d935" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_77200691-3cbd-427c-b4ec-761294eb3370" xlink:to="loc_us-gaap_OtherExpenseMember_f03eebc5-3a28-490a-a3cb-8075ad65d935" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsAcquisitionRelatedContingentConsiderationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsAcquisitionRelatedContingentConsiderationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsAcquisitionRelatedContingentConsiderationDetails" xlink:type="extended" id="idbdb94933b9a4ca989e9f4f65c1dcb1f_FairValueofFinancialInstrumentsAcquisitionRelatedContingentConsiderationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_998759dd-f19b-4167-ad6d-3a74ad3f86e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_998759dd-f19b-4167-ad6d-3a74ad3f86e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_8c36635f-7be9-4e1e-878f-864a0befbfef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_8c36635f-7be9-4e1e-878f-864a0befbfef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_628ba482-519e-488d-97a6-4dfeddf7f991" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_628ba482-519e-488d-97a6-4dfeddf7f991" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_5d07f3ce-621f-4747-a457-53ff48782a6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_5d07f3ce-621f-4747-a457-53ff48782a6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_ab7e412a-a7a7-4479-9ac9-1095dfb190b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_ab7e412a-a7a7-4479-9ac9-1095dfb190b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_7dc9910f-0ac8-42ca-b10d-e771df724afc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_7dc9910f-0ac8-42ca-b10d-e771df724afc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_5c5c5dd5-6bc9-46aa-96ee-831a65f46203" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_5c5c5dd5-6bc9-46aa-96ee-831a65f46203" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_e2446d03-7d11-4301-b7b9-06ec0f26a7b6" xlink:href="mtz-20221231.xsd#mtz_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_mtz_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_e2446d03-7d11-4301-b7b9-06ec0f26a7b6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_8c89086d-fcbe-4d10-8106-6aaf092639fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_8c89086d-fcbe-4d10-8106-6aaf092639fd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_4bdf8095-f758-44b8-ad6b-8f0d4728bda7" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_852aa56c-7944-4650-9cf5-37a8516ee91e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_852aa56c-7944-4650-9cf5-37a8516ee91e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_852aa56c-7944-4650-9cf5-37a8516ee91e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_852aa56c-7944-4650-9cf5-37a8516ee91e" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_852aa56c-7944-4650-9cf5-37a8516ee91e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_aeb9fc3a-f4fa-43a9-b3a9-909cd8bb1c14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_852aa56c-7944-4650-9cf5-37a8516ee91e" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_aeb9fc3a-f4fa-43a9-b3a9-909cd8bb1c14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EarnoutArrangementsMember_44531795-4a80-4310-9e80-dee936dd2bfb" xlink:href="mtz-20221231.xsd#mtz_EarnoutArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_aeb9fc3a-f4fa-43a9-b3a9-909cd8bb1c14" xlink:to="loc_mtz_EarnoutArrangementsMember_44531795-4a80-4310-9e80-dee936dd2bfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_ea576610-32ca-4be4-a8fe-1ae9b38db96f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_ea576610-32ca-4be4-a8fe-1ae9b38db96f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ea576610-32ca-4be4-a8fe-1ae9b38db96f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ea576610-32ca-4be4-a8fe-1ae9b38db96f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ea576610-32ca-4be4-a8fe-1ae9b38db96f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_7e999c36-a9f1-4fe2-ad15-446b5f5a1d17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ea576610-32ca-4be4-a8fe-1ae9b38db96f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_7e999c36-a9f1-4fe2-ad15-446b5f5a1d17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_73a4a122-ddaf-48aa-99a7-4c976316f924" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_7e999c36-a9f1-4fe2-ad15-446b5f5a1d17" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_73a4a122-ddaf-48aa-99a7-4c976316f924" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_1390ab78-7cc4-4659-8024-92b86145c2c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_15d4f8a8-0ff2-4ce9-a417-4a38a09e64b3" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_1390ab78-7cc4-4659-8024-92b86145c2c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_3068dd63-f105-465c-9816-b8b5f0d0b35d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_1390ab78-7cc4-4659-8024-92b86145c2c9" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_3068dd63-f105-465c-9816-b8b5f0d0b35d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_10cde6ad-788c-4cf3-8fff-9ea7fafda199" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_srt_RangeAxis_10cde6ad-788c-4cf3-8fff-9ea7fafda199" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_10cde6ad-788c-4cf3-8fff-9ea7fafda199_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_10cde6ad-788c-4cf3-8fff-9ea7fafda199" xlink:to="loc_srt_RangeMember_10cde6ad-788c-4cf3-8fff-9ea7fafda199_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a6e39100-937a-4ccd-819f-bb7f7cb98710" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_10cde6ad-788c-4cf3-8fff-9ea7fafda199" xlink:to="loc_srt_RangeMember_a6e39100-937a-4ccd-819f-bb7f7cb98710" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1524c941-930a-47c4-8ebb-0b260f91037a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a6e39100-937a-4ccd-819f-bb7f7cb98710" xlink:to="loc_srt_MinimumMember_1524c941-930a-47c4-8ebb-0b260f91037a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_bc68c219-b8e4-49f2-b8e9-5f807ecb77ac" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a6e39100-937a-4ccd-819f-bb7f7cb98710" xlink:to="loc_srt_MaximumMember_bc68c219-b8e4-49f2-b8e9-5f807ecb77ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_3485c4fb-8b7e-4d07-865e-12c6f33c95c6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a6e39100-937a-4ccd-819f-bb7f7cb98710" xlink:to="loc_srt_WeightedAverageMember_3485c4fb-8b7e-4d07-865e-12c6f33c95c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3a864944-103b-4a04-af05-66128222195f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3a864944-103b-4a04-af05-66128222195f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3a864944-103b-4a04-af05-66128222195f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3a864944-103b-4a04-af05-66128222195f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3a864944-103b-4a04-af05-66128222195f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58e09747-c982-47be-a3ea-5b30fa885837" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3a864944-103b-4a04-af05-66128222195f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58e09747-c982-47be-a3ea-5b30fa885837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_AllAcquisitionsMember_d09973e2-b0ff-4e04-8c47-7ad7893d907d" xlink:href="mtz-20221231.xsd#mtz_AllAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58e09747-c982-47be-a3ea-5b30fa885837" xlink:to="loc_mtz_AllAcquisitionsMember_d09973e2-b0ff-4e04-8c47-7ad7893d907d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_1d586fa8-b9e6-4734-8009-094c5f9bfb40" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c493a633-7a84-4866-b368-4c7a07bd5391" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_1d586fa8-b9e6-4734-8009-094c5f9bfb40" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1d586fa8-b9e6-4734-8009-094c5f9bfb40_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1d586fa8-b9e6-4734-8009-094c5f9bfb40" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1d586fa8-b9e6-4734-8009-094c5f9bfb40_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7dce9c7b-4b8e-413a-b321-00291982e469" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1d586fa8-b9e6-4734-8009-094c5f9bfb40" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7dce9c7b-4b8e-413a-b321-00291982e469" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MandatorilyRedeemableStockMember_16fe336d-a3a6-45c3-a04c-aa2fe1271610" xlink:href="mtz-20221231.xsd#mtz_MandatorilyRedeemableStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7dce9c7b-4b8e-413a-b321-00291982e469" xlink:to="loc_mtz_MandatorilyRedeemableStockMember_16fe336d-a3a6-45c3-a04c-aa2fe1271610" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsEquityInvestmentsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsEquityInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsEquityInvestmentsDetails" xlink:type="extended" id="i88b58a3ba08246f4b2f4c85116064bdf_FairValueofFinancialInstrumentsEquityInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_30592218-f5e2-4f95-ad79-5a20a401bccc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_30592218-f5e2-4f95-ad79-5a20a401bccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquityInvestmentWithoutReadilyDeterminableFairValueOwnershipPercentage_f672d626-ffbe-4d7d-a668-791c9f07b101" xlink:href="mtz-20221231.xsd#mtz_EquityInvestmentWithoutReadilyDeterminableFairValueOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_mtz_EquityInvestmentWithoutReadilyDeterminableFairValueOwnershipPercentage_f672d626-ffbe-4d7d-a668-791c9f07b101" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_209b8fc6-3dd5-4ed0-9d6f-5d2f4d79d676" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_209b8fc6-3dd5-4ed0-9d6f-5d2f4d79d676" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_427e5120-69c7-4c82-8d1e-8b2617c052bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_427e5120-69c7-4c82-8d1e-8b2617c052bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount_bece01b9-8c9c-48f7-9979-6897f491c113" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount_bece01b9-8c9c-48f7-9979-6897f491c113" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fbeaa4d5-b810-4483-9bc3-bca00a1ffe27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_46db4265-cfa1-4837-afe8-ef22dc0727b9" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fbeaa4d5-b810-4483-9bc3-bca00a1ffe27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_a95dd747-c4b6-4130-a235-d450935f8840" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fbeaa4d5-b810-4483-9bc3-bca00a1ffe27" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_a95dd747-c4b6-4130-a235-d450935f8840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_a95dd747-c4b6-4130-a235-d450935f8840_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_a95dd747-c4b6-4130-a235-d450935f8840" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_a95dd747-c4b6-4130-a235-d450935f8840_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_dbbbd99f-d069-457b-b516-b5dbbf325479" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_a95dd747-c4b6-4130-a235-d450935f8840" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_dbbbd99f-d069-457b-b516-b5dbbf325479" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_WahaJVsMember_b5f21be4-f478-4870-b597-d7d233c9ea30" xlink:href="mtz-20221231.xsd#mtz_WahaJVsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_dbbbd99f-d069-457b-b516-b5dbbf325479" xlink:to="loc_mtz_WahaJVsMember_b5f21be4-f478-4870-b597-d7d233c9ea30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CrossCountryInfrastructureMember_c1888e0d-c0e7-4c2a-8160-4b0f7ee634cc" xlink:href="mtz-20221231.xsd#mtz_CrossCountryInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_dbbbd99f-d069-457b-b516-b5dbbf325479" xlink:to="loc_mtz_CrossCountryInfrastructureMember_c1888e0d-c0e7-4c2a-8160-4b0f7ee634cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FMTechMember_51182ec3-0d70-42c8-8072-fa2538c9fce8" xlink:href="mtz-20221231.xsd#mtz_FMTechMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_dbbbd99f-d069-457b-b516-b5dbbf325479" xlink:to="loc_mtz_FMTechMember_51182ec3-0d70-42c8-8072-fa2538c9fce8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsTheWahaJVsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsTheWahaJVsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsTheWahaJVsDetails" xlink:type="extended" id="i72e8a3fa619b4cf1b5e591ab31f55034_FairValueofFinancialInstrumentsTheWahaJVsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_ffa0b087-f053-43ef-9375-8b12e31b2717" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_ffa0b087-f053-43ef-9375-8b12e31b2717" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_a888f554-5ffe-49de-a8f1-c4d1feb51db6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_a888f554-5ffe-49de-a8f1-c4d1feb51db6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees_c0205e97-bef2-4008-ad44-29bb64ddbeea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees_c0205e97-bef2-4008-ad44-29bb64ddbeea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_b7cdd03b-d9c1-436e-9ba6-4cd417c464d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_b7cdd03b-d9c1-436e-9ba6-4cd417c464d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_9b30b0f7-e226-4e5c-82d9-1f9fe5d398a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax_9b30b0f7-e226-4e5c-82d9-1f9fe5d398a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_d47eceda-de06-4f11-a412-ebb33b136348" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_d47eceda-de06-4f11-a412-ebb33b136348" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_203726bf-6951-4c54-aa06-97fddbaf972d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0bbf95d1-9527-4207-9828-6fff8099a0a2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_203726bf-6951-4c54-aa06-97fddbaf972d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb5c7264-912e-462c-a74a-9d4d833f645c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_203726bf-6951-4c54-aa06-97fddbaf972d" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb5c7264-912e-462c-a74a-9d4d833f645c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_eb5c7264-912e-462c-a74a-9d4d833f645c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb5c7264-912e-462c-a74a-9d4d833f645c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_eb5c7264-912e-462c-a74a-9d4d833f645c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_75c0c4d0-553c-457b-b2cb-97b075a486c0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb5c7264-912e-462c-a74a-9d4d833f645c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_75c0c4d0-553c-457b-b2cb-97b075a486c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_WahaJVsMember_afd2231c-eea1-4ad8-a765-73e3ad514e59" xlink:href="mtz-20221231.xsd#mtz_WahaJVsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_75c0c4d0-553c-457b-b2cb-97b075a486c0" xlink:to="loc_mtz_WahaJVsMember_afd2231c-eea1-4ad8-a765-73e3ad514e59" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsOtherInvestmentsAVCTDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsOtherInvestmentsAVCTDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsOtherInvestmentsAVCTDetails" xlink:type="extended" id="i2f8b915cc88b4e128b8919512301a43d_FairValueofFinancialInstrumentsOtherInvestmentsAVCTDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquityInvestmentOwnershipPercentage_8e634cd5-d36e-4030-936e-92e7be035e23" xlink:href="mtz-20221231.xsd#mtz_EquityInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_mtz_EquityInvestmentOwnershipPercentage_8e634cd5-d36e-4030-936e-92e7be035e23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BeneficialOwnershipInterestPercentage_23bea889-2e28-48e7-a631-bcd2647defaa" xlink:href="mtz-20221231.xsd#mtz_BeneficialOwnershipInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_mtz_BeneficialOwnershipInterestPercentage_23bea889-2e28-48e7-a631-bcd2647defaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_71bf9a85-9e19-45e9-b802-a64fb1070b79" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesFvNiCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_71bf9a85-9e19-45e9-b802-a64fb1070b79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_a507c212-4293-4357-aa51-ed5ac19f8da0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_a507c212-4293-4357-aa51-ed5ac19f8da0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_f1c9f423-a159-49bc-8cd8-a7fd9b5cc25a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_f1c9f423-a159-49bc-8cd8-a7fd9b5cc25a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_0e0485fb-7d7c-4cef-8b2c-8716207299f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_0e0485fb-7d7c-4cef-8b2c-8716207299f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_2514026c-2b21-44ab-ace2-b44f68be428e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_2514026c-2b21-44ab-ace2-b44f68be428e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_9cd65fd9-4500-499f-bd02-8f7deed77167" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_9cd65fd9-4500-499f-bd02-8f7deed77167" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fa554bad-da70-408a-ada5-fac9f5b39169" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6491de74-a978-4920-a656-22251452a23f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fa554bad-da70-408a-ada5-fac9f5b39169" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_3d50f528-550b-4fda-b595-a50e489e48a5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fa554bad-da70-408a-ada5-fac9f5b39169" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_3d50f528-550b-4fda-b595-a50e489e48a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_3d50f528-550b-4fda-b595-a50e489e48a5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_3d50f528-550b-4fda-b595-a50e489e48a5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_3d50f528-550b-4fda-b595-a50e489e48a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_3ddff985-2991-4bcf-b796-e649500cfb63" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_3d50f528-550b-4fda-b595-a50e489e48a5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_3ddff985-2991-4bcf-b796-e649500cfb63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_AVCTMember_9e7929db-0b52-4954-a52a-1d11ec536df0" xlink:href="mtz-20221231.xsd#mtz_AVCTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_3ddff985-2991-4bcf-b796-e649500cfb63" xlink:to="loc_mtz_AVCTMember_9e7929db-0b52-4954-a52a-1d11ec536df0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_a47dedb9-db19-4d45-a292-c4593a37cc59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fa554bad-da70-408a-ada5-fac9f5b39169" xlink:to="loc_us-gaap_FinancialInstrumentAxis_a47dedb9-db19-4d45-a292-c4593a37cc59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a47dedb9-db19-4d45-a292-c4593a37cc59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_a47dedb9-db19-4d45-a292-c4593a37cc59" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a47dedb9-db19-4d45-a292-c4593a37cc59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_978fe6da-7aad-433b-a9f7-f61be1b48969" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_a47dedb9-db19-4d45-a292-c4593a37cc59" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_978fe6da-7aad-433b-a9f7-f61be1b48969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_855ec3b7-6633-4254-b07e-30b74b560588" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_978fe6da-7aad-433b-a9f7-f61be1b48969" xlink:to="loc_us-gaap_CommonStockMember_855ec3b7-6633-4254-b07e-30b74b560588" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsOtherInvestmentsOtherEquityInvestmentsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsOtherInvestmentsOtherEquityInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsOtherInvestmentsOtherEquityInvestmentsDetails" xlink:type="extended" id="i0ef523211f434464baba6fbeef540605_FairValueofFinancialInstrumentsOtherInvestmentsOtherEquityInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligation_cbeb9071-65f4-4f17-933d-0a5ea9fd42b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_ContractualObligation_cbeb9071-65f4-4f17-933d-0a5ea9fd42b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_f8573ee3-d280-49f8-83b1-5ce95beac33c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_f8573ee3-d280-49f8-83b1-5ce95beac33c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_b47a2c7f-eb72-4548-98b2-9d7cb134c786" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_b47a2c7f-eb72-4548-98b2-9d7cb134c786" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_526d210e-3879-4607-8164-6f72119fb9db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_526d210e-3879-4607-8164-6f72119fb9db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_2c5c2b7e-db75-489b-975e-dee7ab893424" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_2c5c2b7e-db75-489b-975e-dee7ab893424" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_57ea6a22-0e80-4c31-9600-2e43eb6b36c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_57ea6a22-0e80-4c31-9600-2e43eb6b36c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_0635274d-f37a-4fe6-b08e-32b01a34e288" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_0635274d-f37a-4fe6-b08e-32b01a34e288" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableRelatedParties_34548400-65cb-44ce-b776-58c8c01d3637" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_AccountsReceivableRelatedParties_34548400-65cb-44ce-b776-58c8c01d3637" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolving_cbd39beb-11c6-452a-a56a-e5a143ecce03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_FinancingReceivableRevolving_cbd39beb-11c6-452a-a56a-e5a143ecce03" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_da627ae6-e0dd-4f55-bfd4-891d67b36a39" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_760be795-1a4c-4408-a2bb-2f4f24e2a870" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_760be795-1a4c-4408-a2bb-2f4f24e2a870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_760be795-1a4c-4408-a2bb-2f4f24e2a870_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_760be795-1a4c-4408-a2bb-2f4f24e2a870" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_760be795-1a4c-4408-a2bb-2f4f24e2a870_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_760be795-1a4c-4408-a2bb-2f4f24e2a870" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ConfluenceMember_33330cf9-b7dc-4425-ba1a-48ade2283047" xlink:href="mtz-20221231.xsd#mtz_ConfluenceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:to="loc_mtz_ConfluenceMember_33330cf9-b7dc-4425-ba1a-48ade2283047" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FMTechMember_3d8ab1aa-5b6f-407c-94fb-6ec37fdb6a34" xlink:href="mtz-20221231.xsd#mtz_FMTechMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:to="loc_mtz_FMTechMember_3d8ab1aa-5b6f-407c-94fb-6ec37fdb6a34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_TelecommunicationsEquityMethodInvesteesMember_25de9b7e-1a9d-4c5f-ac29-e08541b97566" xlink:href="mtz-20221231.xsd#mtz_TelecommunicationsEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:to="loc_mtz_TelecommunicationsEquityMethodInvesteesMember_25de9b7e-1a9d-4c5f-ac29-e08541b97566" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CertainEntitiesEachAccountedForUsingEquityMethodInvestmentsMember_f0e90b12-0cbf-4c66-8ed0-f1ed96c5ff64" xlink:href="mtz-20221231.xsd#mtz_CertainEntitiesEachAccountedForUsingEquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_de250d3d-7a72-4be4-89de-3522ebf36889" xlink:to="loc_mtz_CertainEntitiesEachAccountedForUsingEquityMethodInvestmentsMember_f0e90b12-0cbf-4c66-8ed0-f1ed96c5ff64" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:to="loc_srt_RangeAxis_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5" xlink:to="loc_srt_RangeMember_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4f0f9262-8239-4630-b39b-ef63c0c0997d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9da44dcb-a6c5-4d0a-8d10-c729ff8c4ec5" xlink:to="loc_srt_RangeMember_4f0f9262-8239-4630-b39b-ef63c0c0997d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2646e209-6e6d-4154-a130-3c4e2222c254" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4f0f9262-8239-4630-b39b-ef63c0c0997d" xlink:to="loc_srt_MaximumMember_2646e209-6e6d-4154-a130-3c4e2222c254" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_8668a51d-1fe7-4a16-8561-6f01885a7835" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_8668a51d-1fe7-4a16-8561-6f01885a7835" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_8668a51d-1fe7-4a16-8561-6f01885a7835_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8668a51d-1fe7-4a16-8561-6f01885a7835" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_8668a51d-1fe7-4a16-8561-6f01885a7835_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_a68714f4-0740-4307-887c-914cdfedd47e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8668a51d-1fe7-4a16-8561-6f01885a7835" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_a68714f4-0740-4307-887c-914cdfedd47e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SubcontractingArrangementsMember_080a0d48-c882-4746-b635-fe6783eb33d0" xlink:href="mtz-20221231.xsd#mtz_SubcontractingArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a68714f4-0740-4307-887c-914cdfedd47e" xlink:to="loc_mtz_SubcontractingArrangementsMember_080a0d48-c882-4746-b635-fe6783eb33d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EmployeeLeasingAndAdvancedReceivableArrangementMember_bb16ec7c-e0f6-4139-b619-427f73257062" xlink:href="mtz-20221231.xsd#mtz_EmployeeLeasingAndAdvancedReceivableArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a68714f4-0740-4307-887c-914cdfedd47e" xlink:to="loc_mtz_EmployeeLeasingAndAdvancedReceivableArrangementMember_bb16ec7c-e0f6-4139-b619-427f73257062" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_cfc4483f-87ab-416c-bb9f-dd1eadaf903c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_cfc4483f-87ab-416c-bb9f-dd1eadaf903c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cfc4483f-87ab-416c-bb9f-dd1eadaf903c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_cfc4483f-87ab-416c-bb9f-dd1eadaf903c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cfc4483f-87ab-416c-bb9f-dd1eadaf903c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_ee546167-10f1-4758-bbe5-9c4c0bcc6fc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_cfc4483f-87ab-416c-bb9f-dd1eadaf903c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_ee546167-10f1-4758-bbe5-9c4c0bcc6fc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_77f6577f-ac03-47f0-b214-41f56393e6a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_ee546167-10f1-4758-bbe5-9c4c0bcc6fc8" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_77f6577f-ac03-47f0-b214-41f56393e6a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3bec2245-916a-4c30-8d2c-b47dd2956621" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_dc26f51a-4a94-4457-a5e2-5514a5b3c5a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_cef070ed-d90f-48cc-a1bc-2dadd1fbbcec" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_dc26f51a-4a94-4457-a5e2-5514a5b3c5a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_6f0c8dd8-33a1-4934-8514-2aa73383ea3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_dc26f51a-4a94-4457-a5e2-5514a5b3c5a4" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_6f0c8dd8-33a1-4934-8514-2aa73383ea3a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/FairValueofFinancialInstrumentsSeniorNotesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#FairValueofFinancialInstrumentsSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/FairValueofFinancialInstrumentsSeniorNotesDetails" xlink:type="extended" id="i892accc362cd4f1ba7099029640b07b2_FairValueofFinancialInstrumentsSeniorNotesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f6e7b39f-9dc1-407b-aa1b-7747211a0209" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5439ef77-530d-422e-8e1f-4e872db38e06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f6e7b39f-9dc1-407b-aa1b-7747211a0209" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5439ef77-530d-422e-8e1f-4e872db38e06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_ee2bebaa-a38a-485d-9b66-f1925df8bc0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f6e7b39f-9dc1-407b-aa1b-7747211a0209" xlink:to="loc_us-gaap_SeniorNotes_ee2bebaa-a38a-485d-9b66-f1925df8bc0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_8b777613-9fc7-4ad4-8ff0-5924cf9d492a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f6e7b39f-9dc1-407b-aa1b-7747211a0209" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_8b777613-9fc7-4ad4-8ff0-5924cf9d492a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_29ddb4fd-4f21-43f2-96f5-d9da597c2703" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f6e7b39f-9dc1-407b-aa1b-7747211a0209" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_29ddb4fd-4f21-43f2-96f5-d9da597c2703" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_bff1b4b1-94fd-4021-9ef1-081796378f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_29ddb4fd-4f21-43f2-96f5-d9da597c2703" xlink:to="loc_us-gaap_DebtInstrumentAxis_bff1b4b1-94fd-4021-9ef1-081796378f8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_bff1b4b1-94fd-4021-9ef1-081796378f8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_bff1b4b1-94fd-4021-9ef1-081796378f8e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_bff1b4b1-94fd-4021-9ef1-081796378f8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d43a6b0d-aff5-40ae-82d4-1c3a7f906147" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_bff1b4b1-94fd-4021-9ef1-081796378f8e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d43a6b0d-aff5-40ae-82d4-1c3a7f906147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointFivePercentSeniorNotesMember_01692063-0cfc-4eca-8ab2-16e7e03b4b69" xlink:href="mtz-20221231.xsd#mtz_FourPointFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d43a6b0d-aff5-40ae-82d4-1c3a7f906147" xlink:to="loc_mtz_FourPointFivePercentSeniorNotesMember_01692063-0cfc-4eca-8ab2-16e7e03b4b69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_e06bd651-1f34-42f5-9e37-e2d0c8f45167" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d43a6b0d-aff5-40ae-82d4-1c3a7f906147" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_e06bd651-1f34-42f5-9e37-e2d0c8f45167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentIEASeniorNotesMember_e6248a64-94ea-44fe-9e30-0abe8ca87839" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentIEASeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_e06bd651-1f34-42f5-9e37-e2d0c8f45167" xlink:to="loc_mtz_SixPointSixTwoFivePercentIEASeniorNotesMember_e6248a64-94ea-44fe-9e30-0abe8ca87839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentMasTecSeniorNotesMember_736dad0d-d5c7-4749-9883-ac48ecb96743" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentMasTecSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_e06bd651-1f34-42f5-9e37-e2d0c8f45167" xlink:to="loc_mtz_SixPointSixTwoFivePercentMasTecSeniorNotesMember_736dad0d-d5c7-4749-9883-ac48ecb96743" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01e4b913-46d4-42d5-959b-26af129cef87" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_29ddb4fd-4f21-43f2-96f5-d9da597c2703" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01e4b913-46d4-42d5-959b-26af129cef87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01e4b913-46d4-42d5-959b-26af129cef87_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01e4b913-46d4-42d5-959b-26af129cef87" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01e4b913-46d4-42d5-959b-26af129cef87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_73fa000b-8231-4ab9-b80f-a61b38973dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01e4b913-46d4-42d5-959b-26af129cef87" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_73fa000b-8231-4ab9-b80f-a61b38973dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_a8d2b87a-ac54-414c-9141-430d1d80cfc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_73fa000b-8231-4ab9-b80f-a61b38973dfc" xlink:to="loc_us-gaap_SeniorNotesMember_a8d2b87a-ac54-414c-9141-430d1d80cfc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_b6a9fbda-01b7-402f-819e-bd6471ad9a35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_29ddb4fd-4f21-43f2-96f5-d9da597c2703" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_b6a9fbda-01b7-402f-819e-bd6471ad9a35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b6a9fbda-01b7-402f-819e-bd6471ad9a35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b6a9fbda-01b7-402f-819e-bd6471ad9a35" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b6a9fbda-01b7-402f-819e-bd6471ad9a35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f2c9c58-41b2-4867-8e98-91819b713ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b6a9fbda-01b7-402f-819e-bd6471ad9a35" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f2c9c58-41b2-4867-8e98-91819b713ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_03f66416-ac4d-42df-b9cc-a272d3ef138a" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f2c9c58-41b2-4867-8e98-91819b713ee1" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_03f66416-ac4d-42df-b9cc-a272d3ef138a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/AccountsReceivableNetofAllowanceandContractAssetsandLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#AccountsReceivableNetofAllowanceandContractAssetsandLiabilitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/AccountsReceivableNetofAllowanceandContractAssetsandLiabilitiesNarrativeDetails" xlink:type="extended" id="ifae69b10a28a4939aec207dad6830d8f_AccountsReceivableNetofAllowanceandContractAssetsandLiabilitiesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RetainagePercentOfContractBillings_9dac41fe-b51e-4b92-8e66-d4948c70cb11" xlink:href="mtz-20221231.xsd#mtz_RetainagePercentOfContractBillings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_mtz_RetainagePercentOfContractBillings_9dac41fe-b51e-4b92-8e66-d4948c70cb11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RetainageExpectedCollectionPeriod_cdcc6974-94db-43dd-a47d-8c72d39e09e7" xlink:href="mtz-20221231.xsd#mtz_RetainageExpectedCollectionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_mtz_RetainageExpectedCollectionPeriod_cdcc6974-94db-43dd-a47d-8c72d39e09e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_7eda9e38-f935-48ab-b435-f9c2349ee9b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_7eda9e38-f935-48ab-b435-f9c2349ee9b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_3b513911-210a-491d-a4a4-f109716ef82c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_3b513911-210a-491d-a4a4-f109716ef82c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_9845a81d-079d-48e7-9ec1-0285e936fe0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_9845a81d-079d-48e7-9ec1-0285e936fe0e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ContractWithCustomerLiabilityDeferredRevenueCurrent_991db863-d40d-435c-9265-d85538bac19b" xlink:href="mtz-20221231.xsd#mtz_ContractWithCustomerLiabilityDeferredRevenueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_mtz_ContractWithCustomerLiabilityDeferredRevenueCurrent_991db863-d40d-435c-9265-d85538bac19b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_02e94877-3852-4fcc-9a07-2d4ba51c44f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_02e94877-3852-4fcc-9a07-2d4ba51c44f9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRevenueExpenseNet_75d54e03-9241-4ed3-b7fd-4b62ba3931d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRevenueExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_InterestRevenueExpenseNet_75d54e03-9241-4ed3-b7fd-4b62ba3931d0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_8b82bd4b-6581-4983-8a40-2c378815d6f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_9ec19c5b-a69a-4262-9ba6-8b3e3a083b2d" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_8b82bd4b-6581-4983-8a40-2c378815d6f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4b34f938-096e-456f-b7c3-a3e508e7e9e8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_8b82bd4b-6581-4983-8a40-2c378815d6f7" xlink:to="loc_srt_RangeAxis_4b34f938-096e-456f-b7c3-a3e508e7e9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4b34f938-096e-456f-b7c3-a3e508e7e9e8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4b34f938-096e-456f-b7c3-a3e508e7e9e8" xlink:to="loc_srt_RangeMember_4b34f938-096e-456f-b7c3-a3e508e7e9e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_48223e75-1033-4306-ac2a-f6f4796cc3a2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4b34f938-096e-456f-b7c3-a3e508e7e9e8" xlink:to="loc_srt_RangeMember_48223e75-1033-4306-ac2a-f6f4796cc3a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_60e2f565-476e-45ea-9322-317a55bb8cfb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_48223e75-1033-4306-ac2a-f6f4796cc3a2" xlink:to="loc_srt_MinimumMember_60e2f565-476e-45ea-9322-317a55bb8cfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_72180ee5-12af-4fdd-b29b-45edaacd7d16" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_48223e75-1033-4306-ac2a-f6f4796cc3a2" xlink:to="loc_srt_MaximumMember_72180ee5-12af-4fdd-b29b-45edaacd7d16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_db19bfda-d3ac-467a-9813-a75498f44b38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_8b82bd4b-6581-4983-8a40-2c378815d6f7" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_db19bfda-d3ac-467a-9813-a75498f44b38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_db19bfda-d3ac-467a-9813-a75498f44b38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_db19bfda-d3ac-467a-9813-a75498f44b38" xlink:to="loc_us-gaap_ReceivableTypeDomain_db19bfda-d3ac-467a-9813-a75498f44b38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_e2b26cf3-e50a-4929-9ce2-97e45fcac88d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_db19bfda-d3ac-467a-9813-a75498f44b38" xlink:to="loc_us-gaap_ReceivableTypeDomain_e2b26cf3-e50a-4929-9ce2-97e45fcac88d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceReceivablesMember_27df3a88-2a7d-41ba-b570-70ded563e7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_e2b26cf3-e50a-4929-9ce2-97e45fcac88d" xlink:to="loc_us-gaap_FinanceReceivablesMember_27df3a88-2a7d-41ba-b570-70ded563e7ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/PropertyandEquipmentNetScheduleofPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#PropertyandEquipmentNetScheduleofPropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/PropertyandEquipmentNetScheduleofPropertyandEquipmentNetDetails" xlink:type="extended" id="i52eb9fa20c1d4647a11bff8a2cc7d58f_PropertyandEquipmentNetScheduleofPropertyandEquipmentNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d29a4fa9-fbbd-434c-8623-532d19d585e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d29a4fa9-fbbd-434c-8623-532d19d585e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_53df3ee8-dbba-4b1c-a727-a00b592a1b82" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_53df3ee8-dbba-4b1c-a727-a00b592a1b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_0be44c5c-94dc-44f4-bd85-ed8f7ad19ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_0be44c5c-94dc-44f4-bd85-ed8f7ad19ffd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_68bd406e-8f39-45cb-b06f-6f3d7b5be9da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_68bd406e-8f39-45cb-b06f-6f3d7b5be9da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e463717a-ee71-4612-8535-59951e36a1e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d6e14724-53c2-475b-b4a2-a525cc0727db" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e463717a-ee71-4612-8535-59951e36a1e8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e510db28-e525-47e9-a432-a39187ca6846" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e463717a-ee71-4612-8535-59951e36a1e8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e510db28-e525-47e9-a432-a39187ca6846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e510db28-e525-47e9-a432-a39187ca6846_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e510db28-e525-47e9-a432-a39187ca6846" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e510db28-e525-47e9-a432-a39187ca6846_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e510db28-e525-47e9-a432-a39187ca6846" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_7e96c5af-06a9-4836-93ac-93f0f292ab81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:to="loc_us-gaap_LandMember_7e96c5af-06a9-4836-93ac-93f0f292ab81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_5c76a7e0-dcb9-4cf8-ae3c-d6253d91a8fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_5c76a7e0-dcb9-4cf8-ae3c-d6253d91a8fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_7d479fe7-ddd9-4cc6-8059-bce96495a304" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_7d479fe7-ddd9-4cc6-8059-bce96495a304" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_997aac28-79af-4d69-b930-001ae1ed5d14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_997aac28-79af-4d69-b930-001ae1ed5d14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_d231cb5a-c052-4e8f-99a1-581c81738c76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f7056c08-5cf9-41a3-9e04-84a932b1ed67" xlink:to="loc_us-gaap_ConstructionInProgressMember_d231cb5a-c052-4e8f-99a1-581c81738c76" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e65e216d-e41b-4bfa-810d-6f2db85e85b2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e463717a-ee71-4612-8535-59951e36a1e8" xlink:to="loc_srt_RangeAxis_e65e216d-e41b-4bfa-810d-6f2db85e85b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e65e216d-e41b-4bfa-810d-6f2db85e85b2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e65e216d-e41b-4bfa-810d-6f2db85e85b2" xlink:to="loc_srt_RangeMember_e65e216d-e41b-4bfa-810d-6f2db85e85b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2de204fb-ac0b-43e2-9a49-bb5b8e86a48b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e65e216d-e41b-4bfa-810d-6f2db85e85b2" xlink:to="loc_srt_RangeMember_2de204fb-ac0b-43e2-9a49-bb5b8e86a48b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b638a285-af68-44be-93d4-9f2e458bafe6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2de204fb-ac0b-43e2-9a49-bb5b8e86a48b" xlink:to="loc_srt_MinimumMember_b638a285-af68-44be-93d4-9f2e458bafe6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f4ca5e84-f7ae-42a9-ba00-fe5d545a05d4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2de204fb-ac0b-43e2-9a49-bb5b8e86a48b" xlink:to="loc_srt_MaximumMember_f4ca5e84-f7ae-42a9-ba00-fe5d545a05d4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/DebtScheduleofCarryingValuesofDebtDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#DebtScheduleofCarryingValuesofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/DebtScheduleofCarryingValuesofDebtDetails" xlink:type="extended" id="i84e7ee2202bd4193b508ed6cf2fd8a64_DebtScheduleofCarryingValuesofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_61aba500-6559-4dc8-8587-178066ce060d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_61aba500-6559-4dc8-8587-178066ce060d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_1efefbd7-d7d8-4ac4-8e5f-9c414c653451" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_1efefbd7-d7d8-4ac4-8e5f-9c414c653451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FinanceLeaseAndOtherObligations_abe41607-4bd1-4818-87de-4e915e009ddd" xlink:href="mtz-20221231.xsd#mtz_FinanceLeaseAndOtherObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_mtz_FinanceLeaseAndOtherObligations_abe41607-4bd1-4818-87de-4e915e009ddd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LongtermDebtandFinanceLeaseObligationsIncludingCurrentMaturitiesGross_1f8b2e2d-7716-4e8c-81a5-c0efba64711d" xlink:href="mtz-20221231.xsd#mtz_LongtermDebtandFinanceLeaseObligationsIncludingCurrentMaturitiesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_mtz_LongtermDebtandFinanceLeaseObligationsIncludingCurrentMaturitiesGross_1f8b2e2d-7716-4e8c-81a5-c0efba64711d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_02190175-b3f7-4a53-ad5f-a609d466a422" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_02190175-b3f7-4a53-ad5f-a609d466a422" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_6216018c-1a21-4057-8021-a5896f337292" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_6216018c-1a21-4057-8021-a5896f337292" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_ff787f95-8e24-448d-9f23-eb4432e46970" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_ff787f95-8e24-448d-9f23-eb4432e46970" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_168279f1-697d-4a33-88b0-7a62abbe4c49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_168279f1-697d-4a33-88b0-7a62abbe4c49" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_7067e8a5-081c-49f5-b1bd-0d1a8ab5a608" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_adece08d-2cb1-4c39-a8e8-7dd36d7047be" xlink:to="loc_us-gaap_DebtInstrumentTable_7067e8a5-081c-49f5-b1bd-0d1a8ab5a608" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_d5669278-0573-4bbe-886d-2a4f968b3ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7067e8a5-081c-49f5-b1bd-0d1a8ab5a608" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_d5669278-0573-4bbe-886d-2a4f968b3ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_d5669278-0573-4bbe-886d-2a4f968b3ee1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d5669278-0573-4bbe-886d-2a4f968b3ee1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_d5669278-0573-4bbe-886d-2a4f968b3ee1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_20a95394-63eb-4caf-a58d-86a698b0b9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d5669278-0573-4bbe-886d-2a4f968b3ee1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_20a95394-63eb-4caf-a58d-86a698b0b9ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticLineOfCreditMember_8487fba1-bcf2-4d28-8072-b24be7ebdae3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_20a95394-63eb-4caf-a58d-86a698b0b9ab" xlink:to="loc_us-gaap_DomesticLineOfCreditMember_8487fba1-bcf2-4d28-8072-b24be7ebdae3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_b2b7fdff-8739-44f3-a68c-19339373b8fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_20a95394-63eb-4caf-a58d-86a698b0b9ab" xlink:to="loc_us-gaap_SeniorNotesMember_b2b7fdff-8739-44f3-a68c-19339373b8fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_0759125b-abf7-49e0-b881-901b7515c025" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7067e8a5-081c-49f5-b1bd-0d1a8ab5a608" xlink:to="loc_us-gaap_CreditFacilityAxis_0759125b-abf7-49e0-b881-901b7515c025" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_0759125b-abf7-49e0-b881-901b7515c025_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_0759125b-abf7-49e0-b881-901b7515c025" xlink:to="loc_us-gaap_CreditFacilityDomain_0759125b-abf7-49e0-b881-901b7515c025_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ef891dac-ab56-4372-8bf1-6c2826000c44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_0759125b-abf7-49e0-b881-901b7515c025" xlink:to="loc_us-gaap_CreditFacilityDomain_ef891dac-ab56-4372-8bf1-6c2826000c44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_b225429d-c4eb-40b0-8a13-53f846c8675f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ef891dac-ab56-4372-8bf1-6c2826000c44" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_b225429d-c4eb-40b0-8a13-53f846c8675f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_9e2e2d1f-b2ff-484c-9f10-e3fca0f564e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ef891dac-ab56-4372-8bf1-6c2826000c44" xlink:to="loc_us-gaap_LoansPayableMember_9e2e2d1f-b2ff-484c-9f10-e3fca0f564e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_60d145dd-c544-47a0-84e1-affba65f3f21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7067e8a5-081c-49f5-b1bd-0d1a8ab5a608" xlink:to="loc_us-gaap_DebtInstrumentAxis_60d145dd-c544-47a0-84e1-affba65f3f21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_60d145dd-c544-47a0-84e1-affba65f3f21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_60d145dd-c544-47a0-84e1-affba65f3f21" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_60d145dd-c544-47a0-84e1-affba65f3f21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_29806082-65d9-45b6-8fa1-dae37bf4d62e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_60d145dd-c544-47a0-84e1-affba65f3f21" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_29806082-65d9-45b6-8fa1-dae37bf4d62e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointFivePercentSeniorNotesMember_f3dc941c-acbd-46b6-985f-a9d50fca76e5" xlink:href="mtz-20221231.xsd#mtz_FourPointFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29806082-65d9-45b6-8fa1-dae37bf4d62e" xlink:to="loc_mtz_FourPointFivePercentSeniorNotesMember_f3dc941c-acbd-46b6-985f-a9d50fca76e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_ca89fa9e-f969-417c-b8cd-9250c019bf06" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29806082-65d9-45b6-8fa1-dae37bf4d62e" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_ca89fa9e-f969-417c-b8cd-9250c019bf06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022TermLoansMember_05c32514-dca0-4e37-8f66-e7e4197af915" xlink:href="mtz-20221231.xsd#mtz_A2022TermLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29806082-65d9-45b6-8fa1-dae37bf4d62e" xlink:to="loc_mtz_A2022TermLoansMember_05c32514-dca0-4e37-8f66-e7e4197af915" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/DebtSeniorCreditFacilityDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#DebtSeniorCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/DebtSeniorCreditFacilityDetails" xlink:type="extended" id="if8639e35436747c686115bf4c6859e0b_DebtSeniorCreditFacilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_da24d7d5-dbd4-47a1-84bd-99a9a5fa12a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_da24d7d5-dbd4-47a1-84bd-99a9a5fa12a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_ca9bf4c7-a93a-4e59-9b7a-b87d904a7f04" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_ca9bf4c7-a93a-4e59-9b7a-b87d904a7f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_b676bfdd-de48-410d-a256-97ed8d1a0612" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_b676bfdd-de48-410d-a256-97ed8d1a0612" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9dfab761-88b7-4524-8dc7-2ba51a887d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9dfab761-88b7-4524-8dc7-2ba51a887d2d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_faf69694-b53e-44b8-ac04-e77a9fb7711a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_faf69694-b53e-44b8-ac04-e77a9fb7711a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_c0aab640-826c-46ac-bf63-e727ef690e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_c0aab640-826c-46ac-bf63-e727ef690e2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_09fa640c-43fd-4afb-9ac8-29149d6c7d22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_09fa640c-43fd-4afb-9ac8-29149d6c7d22" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_3ad2489d-0dd6-4da0-ae47-8f47257cd220" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_3ad2489d-0dd6-4da0-ae47-8f47257cd220" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_e07e20cb-cf89-4d95-9531-84faf7a4849c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_e07e20cb-cf89-4d95-9531-84faf7a4849c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_ca0605ca-0882-45b8-92a1-4a487229d828" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCredit_ca0605ca-0882-45b8-92a1-4a487229d828" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_292e56c9-fff5-4368-9f13-5f2bafe986fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_292e56c9-fff5-4368-9f13-5f2bafe986fc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_a766920b-03f9-4f0f-96f3-abbc4e7b8053" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_a766920b-03f9-4f0f-96f3-abbc4e7b8053" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RatioOfIndebtednessToNetCapital1_4c240362-ef5b-4728-bd96-ee6eb702e9d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RatioOfIndebtednessToNetCapital1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_RatioOfIndebtednessToNetCapital1_4c240362-ef5b-4728-bd96-ee6eb702e9d8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ConsolidatedInterestCoverageRatio_c61558a5-83ad-4e42-ba41-ac8f04eb471d" xlink:href="mtz-20221231.xsd#mtz_ConsolidatedInterestCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_ConsolidatedInterestCoverageRatio_c61558a5-83ad-4e42-ba41-ac8f04eb471d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PermittedAcquisitionsAmount_9604dd28-8d5b-46de-89d1-94ae529c383f" xlink:href="mtz-20221231.xsd#mtz_PermittedAcquisitionsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_PermittedAcquisitionsAmount_9604dd28-8d5b-46de-89d1-94ae529c383f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfFiscalQuartersSubsequentToQuarterInWhichRightWasExercised_cc351de4-129c-4781-89df-5b079022ac1c" xlink:href="mtz-20221231.xsd#mtz_NumberOfFiscalQuartersSubsequentToQuarterInWhichRightWasExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_NumberOfFiscalQuartersSubsequentToQuarterInWhichRightWasExercised_cc351de4-129c-4781-89df-5b079022ac1c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfTimesRightMayBeExercised_4f0e9dfc-615c-417c-a42a-b1e89601ea23" xlink:href="mtz-20221231.xsd#mtz_NumberOfTimesRightMayBeExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_NumberOfTimesRightMayBeExercised_4f0e9dfc-615c-417c-a42a-b1e89601ea23" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_ab8f8407-758e-487c-8770-470361bde63a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_DebtInstrumentTerm_ab8f8407-758e-487c-8770-470361bde63a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum_916082d0-c8bd-410d-b12a-2f291ac88781" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum_916082d0-c8bd-410d-b12a-2f291ac88781" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum_817f86e7-3bcc-48aa-aec8-8c5d0457828d" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum_817f86e7-3bcc-48aa-aec8-8c5d0457828d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_852d885d-689d-4792-9532-2fcaa0452997" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_852d885d-689d-4792-9532-2fcaa0452997" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_805a3b37-7164-4908-b627-30f36d8005d5" xlink:to="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01879b5d-0744-4661-94fe-9d1101404485" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01879b5d-0744-4661-94fe-9d1101404485" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01879b5d-0744-4661-94fe-9d1101404485_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01879b5d-0744-4661-94fe-9d1101404485" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01879b5d-0744-4661-94fe-9d1101404485_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1fb8b633-a85b-4a03-9c32-8104fafbe1e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01879b5d-0744-4661-94fe-9d1101404485" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1fb8b633-a85b-4a03-9c32-8104fafbe1e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticLineOfCreditMember_4711082f-68f1-4eec-a12c-a34b42f97cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1fb8b633-a85b-4a03-9c32-8104fafbe1e5" xlink:to="loc_us-gaap_DomesticLineOfCreditMember_4711082f-68f1-4eec-a12c-a34b42f97cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_e071459c-22b7-425f-9dcf-107e1f923bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1fb8b633-a85b-4a03-9c32-8104fafbe1e5" xlink:to="loc_us-gaap_LineOfCreditMember_e071459c-22b7-425f-9dcf-107e1f923bb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_e763369b-9cdf-4ae3-9504-42bbbe6ef16c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1fb8b633-a85b-4a03-9c32-8104fafbe1e5" xlink:to="loc_us-gaap_SeniorNotesMember_e763369b-9cdf-4ae3-9504-42bbbe6ef16c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_2c57639c-dbfb-49ff-b330-b2dfc312c1ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_CreditFacilityAxis_2c57639c-dbfb-49ff-b330-b2dfc312c1ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_2c57639c-dbfb-49ff-b330-b2dfc312c1ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_2c57639c-dbfb-49ff-b330-b2dfc312c1ff" xlink:to="loc_us-gaap_CreditFacilityDomain_2c57639c-dbfb-49ff-b330-b2dfc312c1ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_2c57639c-dbfb-49ff-b330-b2dfc312c1ff" xlink:to="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_af54af66-fdf5-4164-b7e1-99510a66165d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_af54af66-fdf5-4164-b7e1-99510a66165d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_e12d45b9-6786-4f53-af56-dbd3c21f9b32" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_us-gaap_LoansPayableMember_e12d45b9-6786-4f53-af56-dbd3c21f9b32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ForeignDenominationMember_027e527e-6c4f-4a11-b318-47003b62b06d" xlink:href="mtz-20221231.xsd#mtz_ForeignDenominationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_mtz_ForeignDenominationMember_027e527e-6c4f-4a11-b318-47003b62b06d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_31a85b24-09b4-49a9-98ce-6fca53eaf850" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_us-gaap_LetterOfCreditMember_31a85b24-09b4-49a9-98ce-6fca53eaf850" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LetterofCreditinForeignDenominationMember_1cef32d0-bf50-40ec-9eee-a236da0c1925" xlink:href="mtz-20221231.xsd#mtz_LetterofCreditinForeignDenominationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_mtz_LetterofCreditinForeignDenominationMember_1cef32d0-bf50-40ec-9eee-a236da0c1925" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BridgeLoanMember_c094f15d-464e-4dff-b8f9-aa2fe4ff74c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BridgeLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_us-gaap_BridgeLoanMember_c094f15d-464e-4dff-b8f9-aa2fe4ff74c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_1afcfb63-20d6-489a-b176-cf810fd24752" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_us-gaap_UnsecuredDebtMember_1afcfb63-20d6-489a-b176-cf810fd24752" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BridgeFacilityAndTermLoanFacilityMember_1fabf6ba-78fc-4be1-98fb-d5f5d5737f7f" xlink:href="mtz-20221231.xsd#mtz_BridgeFacilityAndTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_2ac5542b-a493-4a29-9c02-d7f5e5d42b8d" xlink:to="loc_mtz_BridgeFacilityAndTermLoanFacilityMember_1fabf6ba-78fc-4be1-98fb-d5f5d5737f7f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3bc398a8-23c6-4783-ba37-8eb6e6e26368" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_srt_RangeAxis_3bc398a8-23c6-4783-ba37-8eb6e6e26368" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3bc398a8-23c6-4783-ba37-8eb6e6e26368_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3bc398a8-23c6-4783-ba37-8eb6e6e26368" xlink:to="loc_srt_RangeMember_3bc398a8-23c6-4783-ba37-8eb6e6e26368_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c601b3e0-d6fd-404e-b8a3-e43b6d5550c2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3bc398a8-23c6-4783-ba37-8eb6e6e26368" xlink:to="loc_srt_RangeMember_c601b3e0-d6fd-404e-b8a3-e43b6d5550c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_58680b40-1771-4f7f-aa9b-c4aa4973938b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c601b3e0-d6fd-404e-b8a3-e43b6d5550c2" xlink:to="loc_srt_MinimumMember_58680b40-1771-4f7f-aa9b-c4aa4973938b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_20ec18cd-343d-4389-907f-94482d668af9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c601b3e0-d6fd-404e-b8a3-e43b6d5550c2" xlink:to="loc_srt_MaximumMember_20ec18cd-343d-4389-907f-94482d668af9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_83032232-11f0-436b-9012-a96ef848144d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_srt_StatementScenarioAxis_83032232-11f0-436b-9012-a96ef848144d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_83032232-11f0-436b-9012-a96ef848144d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_83032232-11f0-436b-9012-a96ef848144d" xlink:to="loc_srt_ScenarioUnspecifiedDomain_83032232-11f0-436b-9012-a96ef848144d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_8e29bd19-1706-4a3d-b83b-ce5b83b7153b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_83032232-11f0-436b-9012-a96ef848144d" xlink:to="loc_srt_ScenarioUnspecifiedDomain_8e29bd19-1706-4a3d-b83b-ce5b83b7153b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_a2f26b88-4607-4fe7-a7dc-4bb6208a48c7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_8e29bd19-1706-4a3d-b83b-ce5b83b7153b" xlink:to="loc_srt_ScenarioForecastMember_a2f26b88-4607-4fe7-a7dc-4bb6208a48c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScenarioPlanMember_e01b8567-b9d4-4a23-a7ce-927af4fe5f37" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScenarioPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_8e29bd19-1706-4a3d-b83b-ce5b83b7153b" xlink:to="loc_us-gaap_ScenarioPlanMember_e01b8567-b9d4-4a23-a7ce-927af4fe5f37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_35ffdca0-d8ae-4967-866e-8e8fd5d6877c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_VariableRateAxis_35ffdca0-d8ae-4967-866e-8e8fd5d6877c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_35ffdca0-d8ae-4967-866e-8e8fd5d6877c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_35ffdca0-d8ae-4967-866e-8e8fd5d6877c" xlink:to="loc_us-gaap_VariableRateDomain_35ffdca0-d8ae-4967-866e-8e8fd5d6877c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_9aec9411-54b3-4e5c-8f8e-d88db17e39a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_35ffdca0-d8ae-4967-866e-8e8fd5d6877c" xlink:to="loc_us-gaap_VariableRateDomain_9aec9411-54b3-4e5c-8f8e-d88db17e39a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_4b4c5142-c581-49ae-8402-d6ad9807e677" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_9aec9411-54b3-4e5c-8f8e-d88db17e39a7" xlink:to="loc_us-gaap_BaseRateMember_4b4c5142-c581-49ae-8402-d6ad9807e677" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SecuredOvernightFinancingRateSOFRMember_24885418-9c24-40a2-ac47-702558cd7645" xlink:href="mtz-20221231.xsd#mtz_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_9aec9411-54b3-4e5c-8f8e-d88db17e39a7" xlink:to="loc_mtz_SecuredOvernightFinancingRateSOFRMember_24885418-9c24-40a2-ac47-702558cd7645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_2a17834a-4823-4806-abc7-868c415a3f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_2a17834a-4823-4806-abc7-868c415a3f0a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_2a17834a-4823-4806-abc7-868c415a3f0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_2a17834a-4823-4806-abc7-868c415a3f0a" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_2a17834a-4823-4806-abc7-868c415a3f0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_ab8b29ed-8c13-4a03-8660-8b13a8bffaf0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_2a17834a-4823-4806-abc7-868c415a3f0a" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_ab8b29ed-8c13-4a03-8660-8b13a8bffaf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialStandbyLetterOfCreditMember_d90bb501-63a7-4b05-9ef7-cce4abfd6178" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialStandbyLetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_ab8b29ed-8c13-4a03-8660-8b13a8bffaf0" xlink:to="loc_us-gaap_FinancialStandbyLetterOfCreditMember_d90bb501-63a7-4b05-9ef7-cce4abfd6178" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_86360f6a-da22-4a69-9309-6fd07cb35d43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_ab8b29ed-8c13-4a03-8660-8b13a8bffaf0" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_86360f6a-da22-4a69-9309-6fd07cb35d43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_d6129101-6a25-42ef-9b3d-23b3fb835eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_d6129101-6a25-42ef-9b3d-23b3fb835eb2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d6129101-6a25-42ef-9b3d-23b3fb835eb2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d6129101-6a25-42ef-9b3d-23b3fb835eb2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d6129101-6a25-42ef-9b3d-23b3fb835eb2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aed6339d-57f1-423b-a8dd-1e53d59d8058" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d6129101-6a25-42ef-9b3d-23b3fb835eb2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aed6339d-57f1-423b-a8dd-1e53d59d8058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PermittedAcquisitionMember_3fd9214e-a767-446b-9171-75bbb37f4aa9" xlink:href="mtz-20221231.xsd#mtz_PermittedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aed6339d-57f1-423b-a8dd-1e53d59d8058" xlink:to="loc_mtz_PermittedAcquisitionMember_3fd9214e-a767-446b-9171-75bbb37f4aa9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_41af1f92-49cd-458e-ae8c-f7e060b364f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_031e2348-264a-49b2-955f-05feb7d6a932" xlink:to="loc_us-gaap_DebtInstrumentAxis_41af1f92-49cd-458e-ae8c-f7e060b364f6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_41af1f92-49cd-458e-ae8c-f7e060b364f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_41af1f92-49cd-458e-ae8c-f7e060b364f6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_41af1f92-49cd-458e-ae8c-f7e060b364f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_41af1f92-49cd-458e-ae8c-f7e060b364f6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityFiveYearTrancheMember_e6ad54e8-7142-4507-aea7-dddc82306d15" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityFiveYearTrancheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:to="loc_mtz_NewTermLoanFacilityFiveYearTrancheMember_e6ad54e8-7142-4507-aea7-dddc82306d15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityMember_05c655d9-85ec-49bd-91ca-8a6274e61095" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:to="loc_mtz_NewTermLoanFacilityMember_05c655d9-85ec-49bd-91ca-8a6274e61095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityAcquisitionAdjustmentMember_8dc6b7f4-9ea2-48c3-b1a5-7db234527682" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityAcquisitionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:to="loc_mtz_NewTermLoanFacilityAcquisitionAdjustmentMember_8dc6b7f4-9ea2-48c3-b1a5-7db234527682" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_455c711e-896b-4f8b-b658-08130406671b" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_455c711e-896b-4f8b-b658-08130406671b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityThreeYearTrancheMember_14a4eada-b54c-4e48-b71a-ce5ec23a82d5" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityThreeYearTrancheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_220338ed-5854-4b6e-9093-f3364c234ca1" xlink:to="loc_mtz_NewTermLoanFacilityThreeYearTrancheMember_14a4eada-b54c-4e48-b71a-ce5ec23a82d5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/Debt450SeniorNotesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#Debt450SeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/Debt450SeniorNotesDetails" xlink:type="extended" id="i4086ace3b4bf4304aa9e9137199e2283_Debt450SeniorNotesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_970101e2-0976-493c-ac55-4d57a67c2c37" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_970101e2-0976-493c-ac55-4d57a67c2c37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_98c41923-dec6-410b-8e1b-80ae7a7ae8c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_98c41923-dec6-410b-8e1b-80ae7a7ae8c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_f06be935-1adc-42f9-bf55-98d7b3cac1a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_f06be935-1adc-42f9-bf55-98d7b3cac1a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_842c958a-f816-4d12-9d32-e9325d257853" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_842c958a-f816-4d12-9d32-e9325d257853" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentRedemptionPricePercentageWithEquityOfferings_67b25656-869c-4233-9746-20fbde7aa951" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentRedemptionPricePercentageWithEquityOfferings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_mtz_DebtInstrumentRedemptionPricePercentageWithEquityOfferings_67b25656-869c-4233-9746-20fbde7aa951" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentChangeOfControlRedemptionPricePercent_e20ff7af-24bc-4db2-8764-a078f7cdf58f" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentChangeOfControlRedemptionPricePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_mtz_DebtInstrumentChangeOfControlRedemptionPricePercent_e20ff7af-24bc-4db2-8764-a078f7cdf58f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentMinimumPercentageOfPrincipalRequiredToRedeemInTheEventOfDefault_34ea1690-b5f6-4299-a30f-f07b74560240" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentMinimumPercentageOfPrincipalRequiredToRedeemInTheEventOfDefault"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_mtz_DebtInstrumentMinimumPercentageOfPrincipalRequiredToRedeemInTheEventOfDefault_34ea1690-b5f6-4299-a30f-f07b74560240" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_50167956-6a94-4416-b227-676504db05e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_50167956-6a94-4416-b227-676504db05e3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_c41be5a3-12eb-494b-827e-d5b176cd07ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_c41be5a3-12eb-494b-827e-d5b176cd07ac" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_acd52151-4ab4-462a-9cf5-a5a5d35e61c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a3c95a0c-c257-4127-83bb-4bbda21236a6" xlink:to="loc_us-gaap_DebtInstrumentTable_acd52151-4ab4-462a-9cf5-a5a5d35e61c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_fed67bf1-0864-44d9-b857-5c6e307e78d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_acd52151-4ab4-462a-9cf5-a5a5d35e61c6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_fed67bf1-0864-44d9-b857-5c6e307e78d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fed67bf1-0864-44d9-b857-5c6e307e78d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fed67bf1-0864-44d9-b857-5c6e307e78d4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fed67bf1-0864-44d9-b857-5c6e307e78d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_77df13f2-831c-4772-a9eb-61020de06af2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fed67bf1-0864-44d9-b857-5c6e307e78d4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_77df13f2-831c-4772-a9eb-61020de06af2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_544b0ee1-ede3-43c8-9a4e-a203e1079d28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_77df13f2-831c-4772-a9eb-61020de06af2" xlink:to="loc_us-gaap_SeniorNotesMember_544b0ee1-ede3-43c8-9a4e-a203e1079d28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_c4a2f107-0d8a-47a0-9a2c-de4177120b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_acd52151-4ab4-462a-9cf5-a5a5d35e61c6" xlink:to="loc_us-gaap_DebtInstrumentAxis_c4a2f107-0d8a-47a0-9a2c-de4177120b3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c4a2f107-0d8a-47a0-9a2c-de4177120b3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_c4a2f107-0d8a-47a0-9a2c-de4177120b3d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c4a2f107-0d8a-47a0-9a2c-de4177120b3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b365c09a-f292-4646-84cf-9320ebf92126" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_c4a2f107-0d8a-47a0-9a2c-de4177120b3d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b365c09a-f292-4646-84cf-9320ebf92126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointFivePercentSeniorNotesMember_02a956d9-1c81-4700-b6e9-fef519f9ffc4" xlink:href="mtz-20221231.xsd#mtz_FourPointFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b365c09a-f292-4646-84cf-9320ebf92126" xlink:to="loc_mtz_FourPointFivePercentSeniorNotesMember_02a956d9-1c81-4700-b6e9-fef519f9ffc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_46abaaea-5e4c-4ae7-88b5-2f9da20b8c7e" xlink:href="mtz-20221231.xsd#mtz_FourPointEightSevenFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b365c09a-f292-4646-84cf-9320ebf92126" xlink:to="loc_mtz_FourPointEightSevenFivePercentSeniorNotesMember_46abaaea-5e4c-4ae7-88b5-2f9da20b8c7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_30a86030-0cd9-4e62-a2aa-a778eb7a3e30" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_acd52151-4ab4-462a-9cf5-a5a5d35e61c6" xlink:to="loc_srt_StatementScenarioAxis_30a86030-0cd9-4e62-a2aa-a778eb7a3e30" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_30a86030-0cd9-4e62-a2aa-a778eb7a3e30_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_30a86030-0cd9-4e62-a2aa-a778eb7a3e30" xlink:to="loc_srt_ScenarioUnspecifiedDomain_30a86030-0cd9-4e62-a2aa-a778eb7a3e30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5b0a4f59-8e57-4bdb-a3c7-031903dedd08" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_30a86030-0cd9-4e62-a2aa-a778eb7a3e30" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5b0a4f59-8e57-4bdb-a3c7-031903dedd08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_befc90a7-3c4f-4bf5-978d-2bb6b652b7eb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_5b0a4f59-8e57-4bdb-a3c7-031903dedd08" xlink:to="loc_srt_ScenarioForecastMember_befc90a7-3c4f-4bf5-978d-2bb6b652b7eb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/DebtOtherCreditFacilitiesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#DebtOtherCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/DebtOtherCreditFacilitiesDetails" xlink:type="extended" id="ifb2642ba08cd4943bc8e138bbebb5249_DebtOtherCreditFacilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_cb324f97-ae40-48d9-a808-9e336bfe6647" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_cb324f97-ae40-48d9-a808-9e336bfe6647" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ac416848-0331-4e5a-af62-a0aabdcbf730" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ac416848-0331-4e5a-af62-a0aabdcbf730" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_02463d28-dc25-4b6d-9e39-f0b3d26366e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_02463d28-dc25-4b6d-9e39-f0b3d26366e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_3a800060-52e2-4ddd-ba49-e35b78882bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_3a800060-52e2-4ddd-ba49-e35b78882bfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4fa09588-4655-4e46-bc30-1efda6d491a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c68a69ec-b22b-4398-818b-4869fc0117a3" xlink:to="loc_us-gaap_DebtInstrumentTable_4fa09588-4655-4e46-bc30-1efda6d491a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4a07bede-63ef-4284-beae-1a1b14f87491" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4fa09588-4655-4e46-bc30-1efda6d491a4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4a07bede-63ef-4284-beae-1a1b14f87491" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4a07bede-63ef-4284-beae-1a1b14f87491_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4a07bede-63ef-4284-beae-1a1b14f87491" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4a07bede-63ef-4284-beae-1a1b14f87491_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c4debb4d-1fc5-4517-831c-f86e8f99fca8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4a07bede-63ef-4284-beae-1a1b14f87491" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c4debb4d-1fc5-4517-831c-f86e8f99fca8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignLineOfCreditMember_f7180c9d-d78a-4902-b0c2-39e786c73084" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_c4debb4d-1fc5-4517-831c-f86e8f99fca8" xlink:to="loc_us-gaap_ForeignLineOfCreditMember_f7180c9d-d78a-4902-b0c2-39e786c73084" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_e9a44d32-b9ea-45a1-8ef4-93230eb48263" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_c4debb4d-1fc5-4517-831c-f86e8f99fca8" xlink:to="loc_us-gaap_LineOfCreditMember_e9a44d32-b9ea-45a1-8ef4-93230eb48263" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_81eb7d27-93fb-4c62-994e-77e6111876fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4fa09588-4655-4e46-bc30-1efda6d491a4" xlink:to="loc_us-gaap_CreditFacilityAxis_81eb7d27-93fb-4c62-994e-77e6111876fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_81eb7d27-93fb-4c62-994e-77e6111876fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_81eb7d27-93fb-4c62-994e-77e6111876fe" xlink:to="loc_us-gaap_CreditFacilityDomain_81eb7d27-93fb-4c62-994e-77e6111876fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_8b33cf8b-9e36-405b-b2a3-756b8aeda7db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_81eb7d27-93fb-4c62-994e-77e6111876fe" xlink:to="loc_us-gaap_CreditFacilityDomain_8b33cf8b-9e36-405b-b2a3-756b8aeda7db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_28494b5d-3a33-40ef-8b67-6c1a32a64f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8b33cf8b-9e36-405b-b2a3-756b8aeda7db" xlink:to="loc_us-gaap_LetterOfCreditMember_28494b5d-3a33-40ef-8b67-6c1a32a64f8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_f7b11165-77f9-4030-a596-3d81af714f09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4fa09588-4655-4e46-bc30-1efda6d491a4" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_f7b11165-77f9-4030-a596-3d81af714f09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_f7b11165-77f9-4030-a596-3d81af714f09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_f7b11165-77f9-4030-a596-3d81af714f09" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_f7b11165-77f9-4030-a596-3d81af714f09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_7a3216ea-b9a0-4d5b-b332-d9ccb43d5bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_f7b11165-77f9-4030-a596-3d81af714f09" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_7a3216ea-b9a0-4d5b-b332-d9ccb43d5bd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_86f9cdfa-7d58-48b9-96a1-2779f13d881c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_7a3216ea-b9a0-4d5b-b332-d9ccb43d5bd6" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_86f9cdfa-7d58-48b9-96a1-2779f13d881c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/DebtIEA6625NotesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#DebtIEA6625NotesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/DebtIEA6625NotesDetails" xlink:type="extended" id="i1afd037c66d444bda8a35635fef6cd82_DebtIEA6625NotesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_39987aac-4f3d-4669-9805-7f8176cfe73e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_39987aac-4f3d-4669-9805-7f8176cfe73e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_76c324a9-8d3d-4cfb-959f-6d8294eadd9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_LongTermDebtFairValue_76c324a9-8d3d-4cfb-959f-6d8294eadd9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_605ac3f8-e924-442c-a88f-d55973096ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_605ac3f8-e924-442c-a88f-d55973096ab3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_85905718-b20c-4513-bee4-e464160395cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_85905718-b20c-4513-bee4-e464160395cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_8e54f61c-d364-4879-916c-f4b184882f32" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_8e54f61c-d364-4879-916c-f4b184882f32" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_0b634c37-9759-4013-adae-95f4e1255cef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentTerm_0b634c37-9759-4013-adae-95f4e1255cef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentOwnershipPercentage_ba398f10-99a3-4b6f-b58b-ddc42efe7077" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_mtz_DebtInstrumentOwnershipPercentage_ba398f10-99a3-4b6f-b58b-ddc42efe7077" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_95859e83-8c49-437b-a2c2-5d39a7231eab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_95859e83-8c49-437b-a2c2-5d39a7231eab" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentConsentPaymentAmount_bb7c9a80-c29d-42ed-bbe1-a3c4824dd7aa" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentConsentPaymentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_mtz_DebtInstrumentConsentPaymentAmount_bb7c9a80-c29d-42ed-bbe1-a3c4824dd7aa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_111ef3a5-5ef6-4690-ae9a-7ba3fdfef6f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5107b6c9-fd1a-480f-9341-19fb18b415f3" xlink:to="loc_us-gaap_DebtInstrumentTable_111ef3a5-5ef6-4690-ae9a-7ba3fdfef6f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_c82989d1-5019-4329-9ca6-89c03f7260f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_111ef3a5-5ef6-4690-ae9a-7ba3fdfef6f7" xlink:to="loc_us-gaap_DebtInstrumentAxis_c82989d1-5019-4329-9ca6-89c03f7260f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c82989d1-5019-4329-9ca6-89c03f7260f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_c82989d1-5019-4329-9ca6-89c03f7260f4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c82989d1-5019-4329-9ca6-89c03f7260f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_423a263e-b73e-4987-85e2-d778e443cdc2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_c82989d1-5019-4329-9ca6-89c03f7260f4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_423a263e-b73e-4987-85e2-d778e443cdc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_4ec2641e-2038-4c2f-8f9e-dc565bdc4df2" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_423a263e-b73e-4987-85e2-d778e443cdc2" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesMember_4ec2641e-2038-4c2f-8f9e-dc565bdc4df2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SixPointSixTwoFivePercentSeniorNotesTwoMember_6a4cb060-cca4-44a2-849b-1590c0111516" xlink:href="mtz-20221231.xsd#mtz_SixPointSixTwoFivePercentSeniorNotesTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_423a263e-b73e-4987-85e2-d778e443cdc2" xlink:to="loc_mtz_SixPointSixTwoFivePercentSeniorNotesTwoMember_6a4cb060-cca4-44a2-849b-1590c0111516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3a22abf7-aa28-4c18-ba36-286cf842770f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_111ef3a5-5ef6-4690-ae9a-7ba3fdfef6f7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3a22abf7-aa28-4c18-ba36-286cf842770f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3a22abf7-aa28-4c18-ba36-286cf842770f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3a22abf7-aa28-4c18-ba36-286cf842770f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3a22abf7-aa28-4c18-ba36-286cf842770f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4cf09b08-6d9e-4568-b083-865af96c0020" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3a22abf7-aa28-4c18-ba36-286cf842770f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4cf09b08-6d9e-4568-b083-865af96c0020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_fcb652f5-d3c1-4db2-87cf-d27d1fe6dd43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4cf09b08-6d9e-4568-b083-865af96c0020" xlink:to="loc_us-gaap_SeniorNotesMember_fcb652f5-d3c1-4db2-87cf-d27d1fe6dd43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_27144375-a3c6-4f41-816a-f8e06600ee72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_111ef3a5-5ef6-4690-ae9a-7ba3fdfef6f7" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_27144375-a3c6-4f41-816a-f8e06600ee72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_27144375-a3c6-4f41-816a-f8e06600ee72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_27144375-a3c6-4f41-816a-f8e06600ee72" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_27144375-a3c6-4f41-816a-f8e06600ee72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_ec31e30f-29f5-450c-8c7d-a7448e64efe2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_27144375-a3c6-4f41-816a-f8e06600ee72" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_ec31e30f-29f5-450c-8c7d-a7448e64efe2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_0ae5a62a-4560-4316-8c2f-85f29724ec56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_ec31e30f-29f5-450c-8c7d-a7448e64efe2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_0ae5a62a-4560-4316-8c2f-85f29724ec56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_c44353f4-cd41-4ed6-bb78-6a349743fb21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_ec31e30f-29f5-450c-8c7d-a7448e64efe2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_c44353f4-cd41-4ed6-bb78-6a349743fb21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_34da4713-05e7-421e-8901-0e0ece578fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_ec31e30f-29f5-450c-8c7d-a7448e64efe2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_34da4713-05e7-421e-8901-0e0ece578fa9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/DebtTermLoanFacilityDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#DebtTermLoanFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/DebtTermLoanFacilityDetails" xlink:type="extended" id="icb2fae54aa27449f8ab09d249e5103ba_DebtTermLoanFacilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_a6ab55a9-85bc-4859-9b34-38255137076f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_a6ab55a9-85bc-4859-9b34-38255137076f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_06889bab-ceb1-4e06-8e61-3ff8d677c2ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtInstrumentTerm_06889bab-ceb1-4e06-8e61-3ff8d677c2ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentQuarterlyInstallments_d32b2ef4-871f-4a16-a9fe-2ac274ae725e" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentQuarterlyInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_mtz_DebtInstrumentQuarterlyInstallments_d32b2ef4-871f-4a16-a9fe-2ac274ae725e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_d3a49996-5564-4805-8f56-2f4f0a300ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_d3a49996-5564-4805-8f56-2f4f0a300ac9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_74d0671f-886e-4422-ac93-f3fcfff5af26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_74d0671f-886e-4422-ac93-f3fcfff5af26" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_b7785441-f266-4d3d-815a-d38e31476ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_b7785441-f266-4d3d-815a-d38e31476ff0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum_e76f0414-4531-4c5e-b97b-2bdee84546cf" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_mtz_DebtInstrumentCovenantConsolidatedLeverageRatioMaximum_e76f0414-4531-4c5e-b97b-2bdee84546cf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum_5cd5fd3e-dcd9-40f0-b30f-599ab4bc4a63" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_mtz_DebtInstrumentConsolidatedInterestCoverageRatioMinimum_5cd5fd3e-dcd9-40f0-b30f-599ab4bc4a63" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_DebtInstrumentAcquisitionAdjustmentMaximum_0814567c-193d-4808-846e-55f1fe56932f" xlink:href="mtz-20221231.xsd#mtz_DebtInstrumentAcquisitionAdjustmentMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_mtz_DebtInstrumentAcquisitionAdjustmentMaximum_0814567c-193d-4808-846e-55f1fe56932f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_d97eef69-9d6e-4bbb-911c-24d1511f443b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_d97eef69-9d6e-4bbb-911c-24d1511f443b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8e624008-5728-4cbb-b98c-ee697e36bbe4" xlink:to="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_b19f52e7-c56c-4361-acde-a4054bd94a14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_us-gaap_CreditFacilityAxis_b19f52e7-c56c-4361-acde-a4054bd94a14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b19f52e7-c56c-4361-acde-a4054bd94a14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_b19f52e7-c56c-4361-acde-a4054bd94a14" xlink:to="loc_us-gaap_CreditFacilityDomain_b19f52e7-c56c-4361-acde-a4054bd94a14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6159827e-1494-4632-9403-ad1be268e8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_b19f52e7-c56c-4361-acde-a4054bd94a14" xlink:to="loc_us-gaap_CreditFacilityDomain_6159827e-1494-4632-9403-ad1be268e8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_d7e63cc5-6e8c-4975-ac97-bf7eec4c88da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6159827e-1494-4632-9403-ad1be268e8a7" xlink:to="loc_us-gaap_UnsecuredDebtMember_d7e63cc5-6e8c-4975-ac97-bf7eec4c88da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_BridgeFacilityAndTermLoanFacilityMember_f60ffe89-ef11-4df7-9520-361862f3748b" xlink:href="mtz-20221231.xsd#mtz_BridgeFacilityAndTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6159827e-1494-4632-9403-ad1be268e8a7" xlink:to="loc_mtz_BridgeFacilityAndTermLoanFacilityMember_f60ffe89-ef11-4df7-9520-361862f3748b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b173695e-4cd4-4f88-b0ff-427ab8ada52a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_us-gaap_DebtInstrumentAxis_b173695e-4cd4-4f88-b0ff-427ab8ada52a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b173695e-4cd4-4f88-b0ff-427ab8ada52a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b173695e-4cd4-4f88-b0ff-427ab8ada52a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b173695e-4cd4-4f88-b0ff-427ab8ada52a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b173695e-4cd4-4f88-b0ff-427ab8ada52a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityThreeYearTrancheMember_7ae4b0be-cf80-4ba0-b31f-2bd9ab4dbdc6" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityThreeYearTrancheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:to="loc_mtz_NewTermLoanFacilityThreeYearTrancheMember_7ae4b0be-cf80-4ba0-b31f-2bd9ab4dbdc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityFiveYearTrancheMember_1b203b87-9811-4c4e-98d0-39f829173fd0" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityFiveYearTrancheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:to="loc_mtz_NewTermLoanFacilityFiveYearTrancheMember_1b203b87-9811-4c4e-98d0-39f829173fd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityMember_cccb9042-d24f-4b01-96ee-70c4a0276760" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:to="loc_mtz_NewTermLoanFacilityMember_cccb9042-d24f-4b01-96ee-70c4a0276760" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NewTermLoanFacilityAcquisitionAdjustmentMember_c39454f2-2f37-4053-811c-68c7f99092d9" xlink:href="mtz-20221231.xsd#mtz_NewTermLoanFacilityAcquisitionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dd1eabbb-93f8-4d65-a6f5-fe9f5408c050" xlink:to="loc_mtz_NewTermLoanFacilityAcquisitionAdjustmentMember_c39454f2-2f37-4053-811c-68c7f99092d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_aaaecbad-a620-46bb-9f37-3fff9f3a6906" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_aaaecbad-a620-46bb-9f37-3fff9f3a6906" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_aaaecbad-a620-46bb-9f37-3fff9f3a6906_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aaaecbad-a620-46bb-9f37-3fff9f3a6906" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_aaaecbad-a620-46bb-9f37-3fff9f3a6906_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_79a8b30a-2635-4c9c-acce-d168db220f38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aaaecbad-a620-46bb-9f37-3fff9f3a6906" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_79a8b30a-2635-4c9c-acce-d168db220f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_d561730c-ef6d-4154-ac3f-32b357369e0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_79a8b30a-2635-4c9c-acce-d168db220f38" xlink:to="loc_us-gaap_LineOfCreditMember_d561730c-ef6d-4154-ac3f-32b357369e0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticLineOfCreditMember_b49d893a-166f-4e15-80e8-4b525d68fffa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_79a8b30a-2635-4c9c-acce-d168db220f38" xlink:to="loc_us-gaap_DomesticLineOfCreditMember_b49d893a-166f-4e15-80e8-4b525d68fffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_c6892437-89d5-4056-8546-3e5844e24fb3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_srt_StatementScenarioAxis_c6892437-89d5-4056-8546-3e5844e24fb3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_c6892437-89d5-4056-8546-3e5844e24fb3_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_c6892437-89d5-4056-8546-3e5844e24fb3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_c6892437-89d5-4056-8546-3e5844e24fb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5d85ce73-24ec-4e3a-86aa-c21181b96b3a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_c6892437-89d5-4056-8546-3e5844e24fb3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5d85ce73-24ec-4e3a-86aa-c21181b96b3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_4f520e87-78b6-44db-a4fa-3b2791c4edc2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_5d85ce73-24ec-4e3a-86aa-c21181b96b3a" xlink:to="loc_srt_ScenarioForecastMember_4f520e87-78b6-44db-a4fa-3b2791c4edc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_srt_RangeAxis_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4" xlink:to="loc_srt_RangeMember_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d68207b5-1002-4217-a4b6-d4e640d70f82" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d5a00ed3-1cef-4616-985e-fa67b3fdd1e4" xlink:to="loc_srt_RangeMember_d68207b5-1002-4217-a4b6-d4e640d70f82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_7be4ac80-1f3f-4b27-aaf5-061c296659c4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d68207b5-1002-4217-a4b6-d4e640d70f82" xlink:to="loc_srt_MinimumMember_7be4ac80-1f3f-4b27-aaf5-061c296659c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e7b20cbe-5f69-4687-a980-d1542ff40182" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d68207b5-1002-4217-a4b6-d4e640d70f82" xlink:to="loc_srt_MaximumMember_e7b20cbe-5f69-4687-a980-d1542ff40182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_f91d6d8d-49e9-467f-981d-2e3fe08cdb68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a7d1a108-064a-4891-8336-b21a698545e6" xlink:to="loc_us-gaap_VariableRateAxis_f91d6d8d-49e9-467f-981d-2e3fe08cdb68" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f91d6d8d-49e9-467f-981d-2e3fe08cdb68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_f91d6d8d-49e9-467f-981d-2e3fe08cdb68" xlink:to="loc_us-gaap_VariableRateDomain_f91d6d8d-49e9-467f-981d-2e3fe08cdb68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_ba299e4a-2978-46cc-ac3e-23d198f4bbd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_f91d6d8d-49e9-467f-981d-2e3fe08cdb68" xlink:to="loc_us-gaap_VariableRateDomain_ba299e4a-2978-46cc-ac3e-23d198f4bbd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SecuredOvernightFinancingRateSOFRMember_a2b3aff5-7dd7-4df4-801c-bcf175e2dbb2" xlink:href="mtz-20221231.xsd#mtz_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ba299e4a-2978-46cc-ac3e-23d198f4bbd6" xlink:to="loc_mtz_SecuredOvernightFinancingRateSOFRMember_a2b3aff5-7dd7-4df4-801c-bcf175e2dbb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_6d733006-7046-4f13-b70b-a48451663d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ba299e4a-2978-46cc-ac3e-23d198f4bbd6" xlink:to="loc_us-gaap_BaseRateMember_6d733006-7046-4f13-b70b-a48451663d4f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/LeaseObligationsOperatingLeasesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#LeaseObligationsOperatingLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/LeaseObligationsOperatingLeasesDetails" xlink:type="extended" id="ic8e14dd9ed2543638cd7508df111e791_LeaseObligationsOperatingLeasesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_62851396-7f61-486a-a5c7-d369425c9427" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_62851396-7f61-486a-a5c7-d369425c9427" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_23be8e8a-f798-48ad-aaff-128d77d44768" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:to="loc_us-gaap_OperatingLeaseExpense_23be8e8a-f798-48ad-aaff-128d77d44768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_8e86d632-ea1e-4de9-9fd2-0e6879a161ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:to="loc_us-gaap_VariableLeaseCost_8e86d632-ea1e-4de9-9fd2-0e6879a161ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_923ec60c-bfb6-4b73-86d3-c46ca01ecf35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:to="loc_us-gaap_ShortTermLeaseCost_923ec60c-bfb6-4b73-86d3-c46ca01ecf35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_e04dd843-b366-4b5a-a1b9-e3a2b6bb2030" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0c430af5-f00b-42e2-8feb-87b8b968d7fa" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_e04dd843-b366-4b5a-a1b9-e3a2b6bb2030" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_e04dd843-b366-4b5a-a1b9-e3a2b6bb2030" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3b92d567-d050-4991-b364-ddb2dd7b242e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbc5c6a1-508d-4cbf-9a19-0d9903f49ec1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3b92d567-d050-4991-b364-ddb2dd7b242e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsMember_48ca801f-50a0-4b16-8a98-e0771d30daf5" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3b92d567-d050-4991-b364-ddb2dd7b242e" xlink:to="loc_mtz_A2022AcquisitionsMember_48ca801f-50a0-4b16-8a98-e0771d30daf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_164c45a3-dc92-4740-8c90-61af115a0ddc" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3b92d567-d050-4991-b364-ddb2dd7b242e" xlink:to="loc_mtz_A2021AcquisitionsMember_164c45a3-dc92-4740-8c90-61af115a0ddc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansAdditionalInformationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#StockBasedCompensationandOtherEmployeeBenefitPlansAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansAdditionalInformationDetails" xlink:type="extended" id="i33716cf7c7774e929927c03f4dcf159a_StockBasedCompensationandOtherEmployeeBenefitPlansAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c758c133-a191-43cf-aa70-c64c2d78a6c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_c758c133-a191-43cf-aa70-c64c2d78a6c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_0d9e2feb-e576-4b5e-892e-40ed7b2ee18a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_0d9e2feb-e576-4b5e-892e-40ed7b2ee18a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_d52fec54-f44f-4006-998d-b61778038272" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_d52fec54-f44f-4006-998d-b61778038272" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_a00ddce0-2741-4c88-819a-6667cdd8b875" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_a00ddce0-2741-4c88-819a-6667cdd8b875" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EmployeeServiceShareBasedCompensationNetTaxBenefitDeficiencyFromVestingOfShareBasedPaymentAwards_b6a7e65f-5297-4221-a47a-00fbfd063f59" xlink:href="mtz-20221231.xsd#mtz_EmployeeServiceShareBasedCompensationNetTaxBenefitDeficiencyFromVestingOfShareBasedPaymentAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_mtz_EmployeeServiceShareBasedCompensationNetTaxBenefitDeficiencyFromVestingOfShareBasedPaymentAwards_b6a7e65f-5297-4221-a47a-00fbfd063f59" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bda468d6-7ce1-40df-8748-fb810f714ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d55877f4-d427-4a85-8c88-dd514aa91c17" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bda468d6-7ce1-40df-8748-fb810f714ccb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_33e05640-193c-4aa4-bbd0-6eb5fb9fae19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bda468d6-7ce1-40df-8748-fb810f714ccb" xlink:to="loc_us-gaap_PlanNameAxis_33e05640-193c-4aa4-bbd0-6eb5fb9fae19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_33e05640-193c-4aa4-bbd0-6eb5fb9fae19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_33e05640-193c-4aa4-bbd0-6eb5fb9fae19" xlink:to="loc_us-gaap_PlanNameDomain_33e05640-193c-4aa4-bbd0-6eb5fb9fae19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_879495fa-6555-4c41-9656-b3f1a7b874e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_33e05640-193c-4aa4-bbd0-6eb5fb9fae19" xlink:to="loc_us-gaap_PlanNameDomain_879495fa-6555-4c41-9656-b3f1a7b874e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2013IncentivePlanMember_f062a4f1-9153-4d73-8f1d-e2d38a0fbd02" xlink:href="mtz-20221231.xsd#mtz_A2013IncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_879495fa-6555-4c41-9656-b3f1a7b874e4" xlink:to="loc_mtz_A2013IncentivePlanMember_f062a4f1-9153-4d73-8f1d-e2d38a0fbd02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EmployeeStockPlansMember_c465ce78-9f07-4610-8e33-4f10a9ebb2ed" xlink:href="mtz-20221231.xsd#mtz_EmployeeStockPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_879495fa-6555-4c41-9656-b3f1a7b874e4" xlink:to="loc_mtz_EmployeeStockPlansMember_c465ce78-9f07-4610-8e33-4f10a9ebb2ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_6714d5c9-5b73-4783-9a54-a5988bacfdb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bda468d6-7ce1-40df-8748-fb810f714ccb" xlink:to="loc_us-gaap_AwardTypeAxis_6714d5c9-5b73-4783-9a54-a5988bacfdb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6714d5c9-5b73-4783-9a54-a5988bacfdb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6714d5c9-5b73-4783-9a54-a5988bacfdb7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6714d5c9-5b73-4783-9a54-a5988bacfdb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc54da07-f91c-4218-82a8-cb1ad371a34a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6714d5c9-5b73-4783-9a54-a5988bacfdb7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc54da07-f91c-4218-82a8-cb1ad371a34a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_e1d58fce-0155-4e6b-aad2-afffbf08f94a" xlink:href="mtz-20221231.xsd#mtz_RestrictedStockAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc54da07-f91c-4218-82a8-cb1ad371a34a" xlink:to="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_e1d58fce-0155-4e6b-aad2-afffbf08f94a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_3c03d164-f144-4afa-8540-7bff00fe8523" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc54da07-f91c-4218-82a8-cb1ad371a34a" xlink:to="loc_us-gaap_EmployeeStockMember_3c03d164-f144-4afa-8540-7bff00fe8523" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansRestrictedSharesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#StockBasedCompensationandOtherEmployeeBenefitPlansRestrictedSharesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansRestrictedSharesDetails" xlink:type="extended" id="ia3f83dd4867f481aa3de936359cba4b2_StockBasedCompensationandOtherEmployeeBenefitPlansRestrictedSharesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_24c7a444-9ad9-46ef-bc90-301a76386af7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_436b9232-afa5-4605-9b10-cc64be1409e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_24c7a444-9ad9-46ef-bc90-301a76386af7" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_436b9232-afa5-4605-9b10-cc64be1409e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e433aea1-4035-4a31-8a17-4af0dd4c9af0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_24c7a444-9ad9-46ef-bc90-301a76386af7" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e433aea1-4035-4a31-8a17-4af0dd4c9af0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_d01d9d4d-b890-4b8e-ab46-dc9df9a2c564" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_24c7a444-9ad9-46ef-bc90-301a76386af7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_d01d9d4d-b890-4b8e-ab46-dc9df9a2c564" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c86ae8d-69c0-4df0-8fb0-f3c13793b54e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_24c7a444-9ad9-46ef-bc90-301a76386af7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c86ae8d-69c0-4df0-8fb0-f3c13793b54e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_72e78504-f845-433b-8feb-3d3d1318536f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c86ae8d-69c0-4df0-8fb0-f3c13793b54e" xlink:to="loc_us-gaap_AwardTypeAxis_72e78504-f845-433b-8feb-3d3d1318536f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72e78504-f845-433b-8feb-3d3d1318536f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_72e78504-f845-433b-8feb-3d3d1318536f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72e78504-f845-433b-8feb-3d3d1318536f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f1927e50-b60b-426c-8e3e-67ef3664f614" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_72e78504-f845-433b-8feb-3d3d1318536f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f1927e50-b60b-426c-8e3e-67ef3664f614" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_8e3fc143-3687-4508-9d33-5417b7574ded" xlink:href="mtz-20221231.xsd#mtz_RestrictedStockAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f1927e50-b60b-426c-8e3e-67ef3664f614" xlink:to="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_8e3fc143-3687-4508-9d33-5417b7574ded" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansScheduleofActivityRestrictedSharesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#StockBasedCompensationandOtherEmployeeBenefitPlansScheduleofActivityRestrictedSharesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansScheduleofActivityRestrictedSharesDetails" xlink:type="extended" id="i30a31fbda6c44a2c81f13e1ef0df2b2b_StockBasedCompensationandOtherEmployeeBenefitPlansScheduleofActivityRestrictedSharesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4f16ebb-353f-4902-b508-b813dff8ab8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4f16ebb-353f-4902-b508-b813dff8ab8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_fc0d3cc3-94c7-4e10-b7ec-79aaaef13b08" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_fc0d3cc3-94c7-4e10-b7ec-79aaaef13b08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_57ef2a71-819a-45a2-a688-c6f3ca92681a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_57ef2a71-819a-45a2-a688-c6f3ca92681a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_415f5882-d0bc-483b-9706-21b9d870a994" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_415f5882-d0bc-483b-9706-21b9d870a994" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8449ad73-0cb6-45a1-9420-68c47e59f0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6ad2398-29e5-411c-aa1b-277b0f39e154" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8449ad73-0cb6-45a1-9420-68c47e59f0f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_55c63069-b8f8-4ec2-8ae4-1fca8f1449ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4f16ebb-353f-4902-b508-b813dff8ab8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a1e9928e-7e20-40d1-a86e-8102da5e8f03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a1e9928e-7e20-40d1-a86e-8102da5e8f03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_aa02545b-97c8-44a9-b438-18911651f5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_aa02545b-97c8-44a9-b438-18911651f5a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_332c592b-976d-4dd7-b52c-0611aa749519" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_332c592b-976d-4dd7-b52c-0611aa749519" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b3679975-58f2-4c38-b096-bc49022f9ea5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2abb68e2-39ac-4841-95cd-2057f93ec8bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b3679975-58f2-4c38-b096-bc49022f9ea5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b3fce1bd-60ab-4d6a-813b-c8e0081d4337" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_576c3bba-d6b4-428e-89ce-adeed79bba5c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4f16ebb-353f-4902-b508-b813dff8ab8f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_576c3bba-d6b4-428e-89ce-adeed79bba5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c4550f90-79e5-41d5-b38f-16ea2e61ea56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_576c3bba-d6b4-428e-89ce-adeed79bba5c" xlink:to="loc_us-gaap_AwardTypeAxis_c4550f90-79e5-41d5-b38f-16ea2e61ea56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4550f90-79e5-41d5-b38f-16ea2e61ea56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c4550f90-79e5-41d5-b38f-16ea2e61ea56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4550f90-79e5-41d5-b38f-16ea2e61ea56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6d785687-baf2-444d-8b4a-018cc6f461c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c4550f90-79e5-41d5-b38f-16ea2e61ea56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6d785687-baf2-444d-8b4a-018cc6f461c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_7494e063-ccd6-4d19-a01c-5fd8a4fb367d" xlink:href="mtz-20221231.xsd#mtz_RestrictedStockAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6d785687-baf2-444d-8b4a-018cc6f461c5" xlink:to="loc_mtz_RestrictedStockAndRestrictedStockUnitsMember_7494e063-ccd6-4d19-a01c-5fd8a4fb367d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_dbab0b3e-c6d7-454a-a543-4fe5862b5b45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6d785687-baf2-444d-8b4a-018cc6f461c5" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_dbab0b3e-c6d7-454a-a543-4fe5862b5b45" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansEmployeeStockPurchasePlansDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#StockBasedCompensationandOtherEmployeeBenefitPlansEmployeeStockPurchasePlansDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/StockBasedCompensationandOtherEmployeeBenefitPlansEmployeeStockPurchasePlansDetails" xlink:type="extended" id="i93e0e5b185534ec8a8564d9ce58f3e83_StockBasedCompensationandOtherEmployeeBenefitPlansEmployeeStockPurchasePlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e7c7950e-c135-4a09-9ed3-d479255fe5fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_50fb0750-bdcd-4b95-a479-b9358a6f54f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e7c7950e-c135-4a09-9ed3-d479255fe5fd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_50fb0750-bdcd-4b95-a479-b9358a6f54f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_1b3569e1-040b-4316-9d1a-026553edb707" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e7c7950e-c135-4a09-9ed3-d479255fe5fd" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_1b3569e1-040b-4316-9d1a-026553edb707" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_9aba28b5-b0d6-4579-8301-00d82661c270" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e7c7950e-c135-4a09-9ed3-d479255fe5fd" xlink:to="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_9aba28b5-b0d6-4579-8301-00d82661c270" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6705d951-0bb0-433d-ad21-4119beb8fa9c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e7c7950e-c135-4a09-9ed3-d479255fe5fd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6705d951-0bb0-433d-ad21-4119beb8fa9c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fb15d03d-62cf-46ec-98bb-783b1b622e46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6705d951-0bb0-433d-ad21-4119beb8fa9c" xlink:to="loc_us-gaap_AwardTypeAxis_fb15d03d-62cf-46ec-98bb-783b1b622e46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb15d03d-62cf-46ec-98bb-783b1b622e46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fb15d03d-62cf-46ec-98bb-783b1b622e46" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fb15d03d-62cf-46ec-98bb-783b1b622e46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4b90620f-b8d8-4c16-bb78-6c31ace55f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fb15d03d-62cf-46ec-98bb-783b1b622e46" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4b90620f-b8d8-4c16-bb78-6c31ace55f3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_522571ca-ee51-45bd-a4e6-1de0eba93dea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4b90620f-b8d8-4c16-bb78-6c31ace55f3d" xlink:to="loc_us-gaap_EmployeeStockMember_522571ca-ee51-45bd-a4e6-1de0eba93dea" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/OtherRetirementPlansNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#OtherRetirementPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/OtherRetirementPlansNarrativeDetails" xlink:type="extended" id="ia2d05a8d2ad34f82bdcd2c9bd7b6707f_OtherRetirementPlansNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansLineItems_f6f2a134-853b-4a61-a4c0-124f5e7c22fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionUnderCollectiveBargainingArrangementToAllParticipatingEmployerContributionsPercentage_c181560e-99bd-4522-9989-98dc07ec8556" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerContributionUnderCollectiveBargainingArrangementToAllParticipatingEmployerContributionsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_f6f2a134-853b-4a61-a4c0-124f5e7c22fb" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionUnderCollectiveBargainingArrangementToAllParticipatingEmployerContributionsPercentage_c181560e-99bd-4522-9989-98dc07ec8556" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMultiemployerPlansTable_160fc16f-1b05-49c0-9f14-7e07af207316" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfMultiemployerPlansTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_f6f2a134-853b-4a61-a4c0-124f5e7c22fb" xlink:to="loc_us-gaap_ScheduleOfMultiemployerPlansTable_160fc16f-1b05-49c0-9f14-7e07af207316" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlanPeriodAxis_a1072343-cd2c-46a6-910f-c1dbf3413313" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlanPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_160fc16f-1b05-49c0-9f14-7e07af207316" xlink:to="loc_mtz_MultiemployerPlanPeriodAxis_a1072343-cd2c-46a6-910f-c1dbf3413313" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlanPeriodDomain_a1072343-cd2c-46a6-910f-c1dbf3413313_default" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlanPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mtz_MultiemployerPlanPeriodAxis_a1072343-cd2c-46a6-910f-c1dbf3413313" xlink:to="loc_mtz_MultiemployerPlanPeriodDomain_a1072343-cd2c-46a6-910f-c1dbf3413313_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlanPeriodDomain_8d3e9d04-f0e3-483f-b0f2-f8b2d24918d5" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlanPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mtz_MultiemployerPlanPeriodAxis_a1072343-cd2c-46a6-910f-c1dbf3413313" xlink:to="loc_mtz_MultiemployerPlanPeriodDomain_8d3e9d04-f0e3-483f-b0f2-f8b2d24918d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlanPeriodOneMember_a9922615-6aa0-457a-916a-45b2996f1d25" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlanPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_MultiemployerPlanPeriodDomain_8d3e9d04-f0e3-483f-b0f2-f8b2d24918d5" xlink:to="loc_mtz_MultiemployerPlanPeriodOneMember_a9922615-6aa0-457a-916a-45b2996f1d25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlanPeriodTwoMember_30723aae-ad63-41bd-86ef-8b8f95750820" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlanPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_MultiemployerPlanPeriodDomain_8d3e9d04-f0e3-483f-b0f2-f8b2d24918d5" xlink:to="loc_mtz_MultiemployerPlanPeriodTwoMember_30723aae-ad63-41bd-86ef-8b8f95750820" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/OtherRetirementPlansScheduleofMultiemployerPensionPlansDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#OtherRetirementPlansScheduleofMultiemployerPensionPlansDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/OtherRetirementPlansScheduleofMultiemployerPensionPlansDetails" xlink:type="extended" id="ic77b5e4437154356ae14895df79f830b_OtherRetirementPlansScheduleofMultiemployerPensionPlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerIdentificationNumber_900cd437-3d5e-4da3-b4a9-8198609cfa70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerIdentificationNumber_900cd437-3d5e-4da3-b4a9-8198609cfa70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantPlanNumber_7a7b9a30-7448-446b-9ee9-a2741550f118" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantPlanNumber_7a7b9a30-7448-446b-9ee9-a2741550f118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_69ad27fd-9ddd-433e-96eb-44b0a1c53b39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_69ad27fd-9ddd-433e-96eb-44b0a1c53b39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate_abb10880-982b-4e9c-b682-ba460910c1ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate_abb10880-982b-4e9c-b682-ba460910c1ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusFixedList_fb197d28-6827-4136-a8dc-a050cd742014" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusFixedList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusFixedList_fb197d28-6827-4136-a8dc-a050cd742014" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusDate_083dcf99-c34a-4e40-8ffc-4a07a4640690" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusDate_083dcf99-c34a-4e40-8ffc-4a07a4640690" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList_9f812d17-045b-4db0-90d1-ef4b84a34c34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList_9f812d17-045b-4db0-90d1-ef4b84a34c34" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList_087af383-0c55-4ac2-91ea-dd71d369e2d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList_087af383-0c55-4ac2-91ea-dd71d369e2d2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost_603966e9-9283-4326-a641-9a066cacb687" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost_603966e9-9283-4326-a641-9a066cacb687" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanEmployerContributionCost_e5329b47-cda4-4bce-8b22-a824f9476e26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanEmployerContributionCost_e5329b47-cda4-4bce-8b22-a824f9476e26" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionExceedsFivePercent_8e550ef6-1ff8-4dd4-b21c-ecc0fda07657" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerContributionExceedsFivePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionExceedsFivePercent_8e550ef6-1ff8-4dd4-b21c-ecc0fda07657" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusExtendedAmortizationProvision_32240a08-11f9-4da0-aaba-9d766e708825" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusExtendedAmortizationProvision"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantCertifiedZoneStatusExtendedAmortizationProvision_32240a08-11f9-4da0-aaba-9d766e708825" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMultiemployerPlansTable_180a4374-8abc-4d34-9b74-5951769d4ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfMultiemployerPlansTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_126c3309-7c21-440a-b8d4-387b66bf7538" xlink:to="loc_us-gaap_ScheduleOfMultiemployerPlansTable_180a4374-8abc-4d34-9b74-5951769d4ee3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_e132752f-8a1c-422c-a827-fcb9a8e21c63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_180a4374-8abc-4d34-9b74-5951769d4ee3" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_e132752f-8a1c-422c-a827-fcb9a8e21c63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e132752f-8a1c-422c-a827-fcb9a8e21c63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e132752f-8a1c-422c-a827-fcb9a8e21c63" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e132752f-8a1c-422c-a827-fcb9a8e21c63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_dc7430b8-9332-4ee3-9c1b-8f2ac4c18aea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e132752f-8a1c-422c-a827-fcb9a8e21c63" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_dc7430b8-9332-4ee3-9c1b-8f2ac4c18aea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_7dacb329-940e-4ca6-80ab-5fc43f8ef6b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_dc7430b8-9332-4ee3-9c1b-8f2ac4c18aea" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_7dacb329-940e-4ca6-80ab-5fc43f8ef6b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_5bd4d987-210e-498f-8530-66fc079da75e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_180a4374-8abc-4d34-9b74-5951769d4ee3" xlink:to="loc_us-gaap_RetirementPlanNameAxis_5bd4d987-210e-498f-8530-66fc079da75e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_5bd4d987-210e-498f-8530-66fc079da75e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_5bd4d987-210e-498f-8530-66fc079da75e" xlink:to="loc_us-gaap_RetirementPlanNameDomain_5bd4d987-210e-498f-8530-66fc079da75e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_5bd4d987-210e-498f-8530-66fc079da75e" xlink:to="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NationalElectricBenefitFundMember_8621ecf6-f134-4a65-95a7-e593fbec8b93" xlink:href="mtz-20221231.xsd#mtz_NationalElectricBenefitFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_NationalElectricBenefitFundMember_8621ecf6-f134-4a65-95a7-e593fbec8b93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LocalUnionNo9IBEWAndOutsideContractorsPensionFundMember_8faffa76-66dd-4967-82f6-3ee6bd05c9fb" xlink:href="mtz-20221231.xsd#mtz_LocalUnionNo9IBEWAndOutsideContractorsPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_LocalUnionNo9IBEWAndOutsideContractorsPensionFundMember_8faffa76-66dd-4967-82f6-3ee6bd05c9fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CentralPensionFundOfTheIUOEParticipatingEmployersMember_5f4d85e3-896b-4425-a804-c0a31fe074fc" xlink:href="mtz-20221231.xsd#mtz_CentralPensionFundOfTheIUOEParticipatingEmployersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_CentralPensionFundOfTheIUOEParticipatingEmployersMember_5f4d85e3-896b-4425-a804-c0a31fe074fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_HeavyGeneralLaborersLocalUnions472And172OfNewJerseyPensionFundMember_5ae6fa4e-f15a-4c82-850f-be20eb1a5d30" xlink:href="mtz-20221231.xsd#mtz_HeavyGeneralLaborersLocalUnions472And172OfNewJerseyPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_HeavyGeneralLaborersLocalUnions472And172OfNewJerseyPensionFundMember_5ae6fa4e-f15a-4c82-850f-be20eb1a5d30" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ConstructionLaborersPensionTrustFundForSouthernCaliforniaMember_333b6d97-7771-4b10-9f19-bf09fc756d85" xlink:href="mtz-20221231.xsd#mtz_ConstructionLaborersPensionTrustFundForSouthernCaliforniaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_ConstructionLaborersPensionTrustFundForSouthernCaliforniaMember_333b6d97-7771-4b10-9f19-bf09fc756d85" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IBEWLocal1249PensionPlanMember_bd30a19a-de8f-4a90-ab82-8b2ad61be30f" xlink:href="mtz-20221231.xsd#mtz_IBEWLocal1249PensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_IBEWLocal1249PensionPlanMember_bd30a19a-de8f-4a90-ab82-8b2ad61be30f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IBEWLocal456PensionPlanMember_16c6551d-a02a-42dc-bd30-d023a9a5c2a2" xlink:href="mtz-20221231.xsd#mtz_IBEWLocal456PensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_IBEWLocal456PensionPlanMember_16c6551d-a02a-42dc-bd30-d023a9a5c2a2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ChicagoVicinityLaborersDistrictCouncilPensionPlanMember_dea2987a-dccb-4e6c-8058-c554e697bf01" xlink:href="mtz-20221231.xsd#mtz_ChicagoVicinityLaborersDistrictCouncilPensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_ChicagoVicinityLaborersDistrictCouncilPensionPlanMember_dea2987a-dccb-4e6c-8058-c554e697bf01" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PipelineIndustryPensionFundMember_f82ceea7-e52e-4841-ab69-a22f7893c22d" xlink:href="mtz-20221231.xsd#mtz_PipelineIndustryPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_PipelineIndustryPensionFundMember_f82ceea7-e52e-4841-ab69-a22f7893c22d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MidwestOperatingEngineersPensionTrustFundMember_bce8de5d-899f-4fc9-ac79-2bcab660b960" xlink:href="mtz-20221231.xsd#mtz_MidwestOperatingEngineersPensionTrustFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_MidwestOperatingEngineersPensionTrustFundMember_bce8de5d-899f-4fc9-ac79-2bcab660b960" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_TeamstersNationalPipeLinePensionPlanMember_80491d2b-a634-47e8-87f9-83bcb749b656" xlink:href="mtz-20221231.xsd#mtz_TeamstersNationalPipeLinePensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_TeamstersNationalPipeLinePensionPlanMember_80491d2b-a634-47e8-87f9-83bcb749b656" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SanDiegoCountyConstructionLaborersPensionTrustFundMember_861aed34-58d2-411d-91b3-8a907efce5f5" xlink:href="mtz-20221231.xsd#mtz_SanDiegoCountyConstructionLaborersPensionTrustFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_SanDiegoCountyConstructionLaborersPensionTrustFundMember_861aed34-58d2-411d-91b3-8a907efce5f5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LaborersLocalUnionNo158PensionPlanMember_28b8a86c-c375-47cf-9e1a-7d4aae6920a7" xlink:href="mtz-20221231.xsd#mtz_LaborersLocalUnionNo158PensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_LaborersLocalUnionNo158PensionPlanMember_28b8a86c-c375-47cf-9e1a-7d4aae6920a7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SouthernCaliforniaPipeTradesRetirementFundMember_d871b3fa-e3fe-48ea-9e4c-b6542f2c1ec3" xlink:href="mtz-20221231.xsd#mtz_SouthernCaliforniaPipeTradesRetirementFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_SouthernCaliforniaPipeTradesRetirementFundMember_d871b3fa-e3fe-48ea-9e4c-b6542f2c1ec3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CentralLaborersPensionFundMember_891b3ed6-0eaa-4692-87be-084cccb0e817" xlink:href="mtz-20221231.xsd#mtz_CentralLaborersPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_CentralLaborersPensionFundMember_891b3ed6-0eaa-4692-87be-084cccb0e817" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_WestVirginiaLaborersPensionTrustFundMember_b5992507-1482-46be-bb77-f8961288bb00" xlink:href="mtz-20221231.xsd#mtz_WestVirginiaLaborersPensionTrustFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_WestVirginiaLaborersPensionTrustFundMember_b5992507-1482-46be-bb77-f8961288bb00" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MinnesotaLaborersPensionFundMember_72be3b01-781d-4b49-91cb-027d17bdf3a5" xlink:href="mtz-20221231.xsd#mtz_MinnesotaLaborersPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_MinnesotaLaborersPensionFundMember_72be3b01-781d-4b49-91cb-027d17bdf3a5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LaborersNationalPensionFundMember_fe2eb7de-3f46-412c-aea9-bef08d5447ff" xlink:href="mtz-20221231.xsd#mtz_LaborersNationalPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_LaborersNationalPensionFundMember_fe2eb7de-3f46-412c-aea9-bef08d5447ff" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EmployerTeamstersLocalNo175And505PensionTrustFundMember_e3716788-c6f5-4ae7-8166-d7c25f887cdb" xlink:href="mtz-20221231.xsd#mtz_EmployerTeamstersLocalNo175And505PensionTrustFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_EmployerTeamstersLocalNo175And505PensionTrustFundMember_e3716788-c6f5-4ae7-8166-d7c25f887cdb" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_LaborersDistrictCouncilofWPAPensionFundMember_03bc6901-69d3-48f8-a2d9-94b4527dd266" xlink:href="mtz-20221231.xsd#mtz_LaborersDistrictCouncilofWPAPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_5a57eb70-548b-4b85-89aa-797b1bd3253b" xlink:to="loc_mtz_LaborersDistrictCouncilofWPAPensionFundMember_03bc6901-69d3-48f8-a2d9-94b4527dd266" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/OtherRetirementPlansScheduleofCoveredEmployeesandContributionsMultiemployerPlansDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#OtherRetirementPlansScheduleofCoveredEmployeesandContributionsMultiemployerPlansDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/OtherRetirementPlansScheduleofCoveredEmployeesandContributionsMultiemployerPlansDetails" xlink:type="extended" id="i4dbd4cefe4c64074b0a54934255c003b_OtherRetirementPlansScheduleofCoveredEmployeesandContributionsMultiemployerPlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansLineItems_b1c32afd-f775-4df6-af4c-7a83896f3fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanNumberOfEmployeesCovered_719f0f61-54ed-42f6-b5e0-55b4a76e987d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanNumberOfEmployeesCovered"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_b1c32afd-f775-4df6-af4c-7a83896f3fd0" xlink:to="loc_us-gaap_MultiemployerPlanNumberOfEmployeesCovered_719f0f61-54ed-42f6-b5e0-55b4a76e987d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanEmployerContributionCost_9fabeea6-cb2a-4769-a9d8-7fd7f51be9c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_b1c32afd-f775-4df6-af4c-7a83896f3fd0" xlink:to="loc_us-gaap_MultiemployerPlanEmployerContributionCost_9fabeea6-cb2a-4769-a9d8-7fd7f51be9c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMultiemployerPlansTable_3b4388c8-5577-4789-a289-7115e31fb8ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfMultiemployerPlansTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_b1c32afd-f775-4df6-af4c-7a83896f3fd0" xlink:to="loc_us-gaap_ScheduleOfMultiemployerPlansTable_3b4388c8-5577-4789-a289-7115e31fb8ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_1af03939-7087-4082-846a-849fbc1d9c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_3b4388c8-5577-4789-a289-7115e31fb8ee" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_1af03939-7087-4082-846a-849fbc1d9c4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1af03939-7087-4082-846a-849fbc1d9c4b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_1af03939-7087-4082-846a-849fbc1d9c4b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1af03939-7087-4082-846a-849fbc1d9c4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_49217144-7beb-47d1-890b-7ec71f5160f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_1af03939-7087-4082-846a-849fbc1d9c4b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_49217144-7beb-47d1-890b-7ec71f5160f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_963fa624-3389-4b60-b716-f7f10665a255" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_49217144-7beb-47d1-890b-7ec71f5160f6" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_963fa624-3389-4b60-b716-f7f10665a255" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_9272d4c7-8680-40d8-9dba-d613fda57d10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_49217144-7beb-47d1-890b-7ec71f5160f6" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_9272d4c7-8680-40d8-9dba-d613fda57d10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0edc56e8-ce9e-41f4-90d4-efdc673529bb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_3b4388c8-5577-4789-a289-7115e31fb8ee" xlink:to="loc_srt_RangeAxis_0edc56e8-ce9e-41f4-90d4-efdc673529bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0edc56e8-ce9e-41f4-90d4-efdc673529bb_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0edc56e8-ce9e-41f4-90d4-efdc673529bb" xlink:to="loc_srt_RangeMember_0edc56e8-ce9e-41f4-90d4-efdc673529bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e4993362-d168-4deb-9e5e-b801170ab3d3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0edc56e8-ce9e-41f4-90d4-efdc673529bb" xlink:to="loc_srt_RangeMember_e4993362-d168-4deb-9e5e-b801170ab3d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fdfc13c3-e027-4489-8463-d8969485e85b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e4993362-d168-4deb-9e5e-b801170ab3d3" xlink:to="loc_srt_MinimumMember_fdfc13c3-e027-4489-8463-d8969485e85b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b8e8c039-1cb4-419d-a3ba-ebdbc53d3bf4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e4993362-d168-4deb-9e5e-b801170ab3d3" xlink:to="loc_srt_MaximumMember_b8e8c039-1cb4-419d-a3ba-ebdbc53d3bf4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/EquityShareActivityDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#EquityShareActivityDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/EquityShareActivityDetails" xlink:type="extended" id="i9f63f685b1b44f1b942831cf96ff491a_EquityShareActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_7827ba09-2fcb-4c6d-a1dc-4d6731dfd98d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_7827ba09-2fcb-4c6d-a1dc-4d6731dfd98d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_b5e3aa1b-ef04-4c57-b9b7-14f82b67b1c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_b5e3aa1b-ef04-4c57-b9b7-14f82b67b1c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_92ab6695-bd46-4ddb-a8c2-4f86fc37b7c7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_92ab6695-bd46-4ddb-a8c2-4f86fc37b7c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_774a50f6-5076-439e-9efa-5be8ad4c7d1f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_774a50f6-5076-439e-9efa-5be8ad4c7d1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_f616863c-87ed-4043-bcf9-b775ed97901c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_f616863c-87ed-4043-bcf9-b775ed97901c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_a68bf80e-f5db-43ae-90ed-ec1e9117e4a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_a68bf80e-f5db-43ae-90ed-ec1e9117e4a6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_36d7cf02-9869-4678-856f-7abc5cd19aa2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_4b6c5784-5460-4a54-9c4a-ca1d98e4aa65" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_36d7cf02-9869-4678-856f-7abc5cd19aa2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_96971a19-ba4d-46a0-8d08-85ee477b6d07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_36d7cf02-9869-4678-856f-7abc5cd19aa2" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_96971a19-ba4d-46a0-8d08-85ee477b6d07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_96971a19-ba4d-46a0-8d08-85ee477b6d07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_96971a19-ba4d-46a0-8d08-85ee477b6d07" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_96971a19-ba4d-46a0-8d08-85ee477b6d07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_12d9dbe3-6efb-433f-abc4-a6a839864dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_96971a19-ba4d-46a0-8d08-85ee477b6d07" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_12d9dbe3-6efb-433f-abc4-a6a839864dc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_December2018ShareRepurchaseProgramMember_2bc3beb4-0a06-47a5-9315-033f70db4bb3" xlink:href="mtz-20221231.xsd#mtz_December2018ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_12d9dbe3-6efb-433f-abc4-a6a839864dc0" xlink:to="loc_mtz_December2018ShareRepurchaseProgramMember_2bc3beb4-0a06-47a5-9315-033f70db4bb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_September2018ShareRepurchaseProgramMember_b65d20a8-a38b-4542-8ce4-a3ae286505c5" xlink:href="mtz-20221231.xsd#mtz_September2018ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_12d9dbe3-6efb-433f-abc4-a6a839864dc0" xlink:to="loc_mtz_September2018ShareRepurchaseProgramMember_b65d20a8-a38b-4542-8ce4-a3ae286505c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_March2020ShareRepurchaseProgramMember_23928647-6f53-4e15-b057-8cca7b8d9bc4" xlink:href="mtz-20221231.xsd#mtz_March2020ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_12d9dbe3-6efb-433f-abc4-a6a839864dc0" xlink:to="loc_mtz_March2020ShareRepurchaseProgramMember_23928647-6f53-4e15-b057-8cca7b8d9bc4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/EquityRollforwardofAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#EquityRollforwardofAccumulatedOtherComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/EquityRollforwardofAccumulatedOtherComprehensiveLossDetails" xlink:type="extended" id="i83023afce49d475ab2fbc52866e57955_EquityRollforwardofAccumulatedOtherComprehensiveLossDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_bff91594-060d-447e-ac10-2a823cc1e461" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5f2fc4ee-839c-458b-9875-e7b6422eba10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_bff91594-060d-447e-ac10-2a823cc1e461" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5f2fc4ee-839c-458b-9875-e7b6422eba10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_0a491343-2c84-41fb-92ae-7715264c348a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_bff91594-060d-447e-ac10-2a823cc1e461" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_0a491343-2c84-41fb-92ae-7715264c348a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_27a2d2ac-cc51-43e1-928f-2091b6c49109" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bdf34e8-c64a-4a02-aee9-6973e3179dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_bff91594-060d-447e-ac10-2a823cc1e461" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bdf34e8-c64a-4a02-aee9-6973e3179dd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f41d9400-1576-4a51-98c1-80e4ff0482e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bdf34e8-c64a-4a02-aee9-6973e3179dd0" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f41d9400-1576-4a51-98c1-80e4ff0482e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f41d9400-1576-4a51-98c1-80e4ff0482e0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f41d9400-1576-4a51-98c1-80e4ff0482e0" xlink:to="loc_us-gaap_EquityComponentDomain_f41d9400-1576-4a51-98c1-80e4ff0482e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_59219467-7bc3-479d-9c58-387a48eae6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f41d9400-1576-4a51-98c1-80e4ff0482e0" xlink:to="loc_us-gaap_EquityComponentDomain_59219467-7bc3-479d-9c58-387a48eae6f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_d74be107-3016-4951-89d5-b30df1904bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_59219467-7bc3-479d-9c58-387a48eae6f8" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_d74be107-3016-4951-89d5-b30df1904bb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_412cb72b-64d5-410e-9c95-78afef575a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_59219467-7bc3-479d-9c58-387a48eae6f8" xlink:to="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_412cb72b-64d5-410e-9c95-78afef575a3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_4013680c-333d-4694-9a10-b69722ff5142" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_59219467-7bc3-479d-9c58-387a48eae6f8" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_4013680c-333d-4694-9a10-b69722ff5142" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="i2497b31141ee4c46bf1197b10db29d4b_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_mtz_IncomeTaxesLineItems_875939cc-d7ae-41a0-b9a3-25b2a48ec833" xlink:href="mtz-20221231.xsd#mtz_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_a52fc25a-12fb-4887-ab66-f61fd0d14588" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IncomeTaxesLineItems_875939cc-d7ae-41a0-b9a3-25b2a48ec833" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_a52fc25a-12fb-4887-ab66-f61fd0d14588" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_32b3a1ac-4e2a-4e05-a097-f71252b4f09a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IncomeTaxesLineItems_875939cc-d7ae-41a0-b9a3-25b2a48ec833" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_32b3a1ac-4e2a-4e05-a097-f71252b4f09a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_d69457a8-9280-4304-a76c-f488db0da175" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtz_IncomeTaxesLineItems_875939cc-d7ae-41a0-b9a3-25b2a48ec833" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_d69457a8-9280-4304-a76c-f488db0da175" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_72115fd3-67b7-40c2-b7b6-6962564dc6c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mtz_IncomeTaxesLineItems_875939cc-d7ae-41a0-b9a3-25b2a48ec833" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_72115fd3-67b7-40c2-b7b6-6962564dc6c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_4d717a60-663b-47cb-b736-53053f656adf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_72115fd3-67b7-40c2-b7b6-6962564dc6c1" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_4d717a60-663b-47cb-b736-53053f656adf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_4d717a60-663b-47cb-b736-53053f656adf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_4d717a60-663b-47cb-b736-53053f656adf" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_4d717a60-663b-47cb-b736-53053f656adf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_adc2526f-affa-468b-9b7f-b3ca73280bd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_4d717a60-663b-47cb-b736-53053f656adf" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_adc2526f-affa-468b-9b7f-b3ca73280bd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_a41a8dc7-7b5f-47d0-b698-5d123ddd43f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_adc2526f-affa-468b-9b7f-b3ca73280bd1" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_a41a8dc7-7b5f-47d0-b698-5d123ddd43f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_1a944c0a-289e-400d-944d-f62ec792359a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_adc2526f-affa-468b-9b7f-b3ca73280bd1" xlink:to="loc_us-gaap_ForeignCountryMember_1a944c0a-289e-400d-944d-f62ec792359a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_bf48776e-8897-42a4-b72e-2df518eb5ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_adc2526f-affa-468b-9b7f-b3ca73280bd1" xlink:to="loc_us-gaap_DomesticCountryMember_bf48776e-8897-42a4-b72e-2df518eb5ec7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationNarrativeDetails" xlink:type="extended" id="ia99f4b6347e54571abbe9f9b22ca6881_SegmentsandRelatedInformationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_893d02e4-3c94-4d21-872a-3421ceed7aca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_c1187351-0e5c-44fc-857c-472bb015b5ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_893d02e4-3c94-4d21-872a-3421ceed7aca" xlink:to="loc_us-gaap_NumberOfOperatingSegments_c1187351-0e5c-44fc-857c-472bb015b5ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_b31401c3-0d92-455b-b42c-20b89ba29b91" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_893d02e4-3c94-4d21-872a-3421ceed7aca" xlink:to="loc_us-gaap_NumberOfReportableSegments_b31401c3-0d92-455b-b42c-20b89ba29b91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_261125d9-1da7-4d2d-aac5-f2cc1d7ab1a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_893d02e4-3c94-4d21-872a-3421ceed7aca" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_261125d9-1da7-4d2d-aac5-f2cc1d7ab1a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fa79c274-4b8b-4c9b-85e7-f1ef3ddce668" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_893d02e4-3c94-4d21-872a-3421ceed7aca" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fa79c274-4b8b-4c9b-85e7-f1ef3ddce668" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_231b7f2f-7b33-4bf2-90be-5504b62839b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fa79c274-4b8b-4c9b-85e7-f1ef3ddce668" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_231b7f2f-7b33-4bf2-90be-5504b62839b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231b7f2f-7b33-4bf2-90be-5504b62839b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_231b7f2f-7b33-4bf2-90be-5504b62839b9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231b7f2f-7b33-4bf2-90be-5504b62839b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3e99549f-2116-490d-a4a8-d6ed042ffa6d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_231b7f2f-7b33-4bf2-90be-5504b62839b9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3e99549f-2116-490d-a4a8-d6ed042ffa6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_902be5e2-166d-47ef-8dfa-f2323936ad5d" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3e99549f-2116-490d-a4a8-d6ed042ffa6d" xlink:to="loc_mtz_A2021AcquisitionsMember_902be5e2-166d-47ef-8dfa-f2323936ad5d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentRevenueDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentRevenueDetails" xlink:type="extended" id="i13260b425ab54c8793077421db0953ae_SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_9732bddd-bf0d-44bd-9a19-1e17c8096e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationRevenueAbstract_461d2dc2-49db-4986-8b3e-56fa5a55da23" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9732bddd-bf0d-44bd-9a19-1e17c8096e0d" xlink:to="loc_us-gaap_SegmentReportingInformationRevenueAbstract_461d2dc2-49db-4986-8b3e-56fa5a55da23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_8c805bf4-a0c3-4aff-a924-b0cf99af8d54" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_461d2dc2-49db-4986-8b3e-56fa5a55da23" xlink:to="loc_us-gaap_Revenues_8c805bf4-a0c3-4aff-a924-b0cf99af8d54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_57af1291-9533-43c7-b316-fd443ca9fdf8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_461d2dc2-49db-4986-8b3e-56fa5a55da23" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_57af1291-9533-43c7-b316-fd443ca9fdf8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9732bddd-bf0d-44bd-9a19-1e17c8096e0d" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ad53b933-37ed-4de3-9e3d-d955f67e9b23" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:to="loc_srt_ConsolidationItemsAxis_ad53b933-37ed-4de3-9e3d-d955f67e9b23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ad53b933-37ed-4de3-9e3d-d955f67e9b23_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ad53b933-37ed-4de3-9e3d-d955f67e9b23" xlink:to="loc_srt_ConsolidationItemsDomain_ad53b933-37ed-4de3-9e3d-d955f67e9b23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_1455d335-431c-42b0-883b-d1dc2bfa63b3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ad53b933-37ed-4de3-9e3d-d955f67e9b23" xlink:to="loc_srt_ConsolidationItemsDomain_1455d335-431c-42b0-883b-d1dc2bfa63b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_9f18e937-235a-4e49-8c67-a7afbcffc800" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_1455d335-431c-42b0-883b-d1dc2bfa63b3" xlink:to="loc_us-gaap_OperatingSegmentsMember_9f18e937-235a-4e49-8c67-a7afbcffc800" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_e6b01e09-b8e7-4099-b1d3-c8b21a6b9360" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_1455d335-431c-42b0-883b-d1dc2bfa63b3" xlink:to="loc_us-gaap_IntersegmentEliminationMember_e6b01e09-b8e7-4099-b1d3-c8b21a6b9360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5" xlink:to="loc_us-gaap_SegmentDomain_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_36b5e98d-fc8e-45ba-8ccc-bd1dde8177f5" xlink:to="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_76fe9e23-654c-4990-bb6e-3aa77d4ad16e" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:to="loc_mtz_CommunicationsMember_76fe9e23-654c-4990-bb6e-3aa77d4ad16e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_dda27995-ab8e-4f67-8430-cbc5129e9a45" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_dda27995-ab8e-4f67-8430-cbc5129e9a45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_ef3825ca-b722-4995-a54c-f9ba4501bd9d" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:to="loc_mtz_OilAndGasSegmentMember_ef3825ca-b722-4995-a54c-f9ba4501bd9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_452b9fba-5c0e-425d-9c27-37f51aacc429" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:to="loc_mtz_PowerDeliveryMember_452b9fba-5c0e-425d-9c27-37f51aacc429" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_23492f1c-dab8-4f65-b05e-360192a0f137" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_73e17f3f-a50e-496e-9304-39461c7a2b7c" xlink:to="loc_us-gaap_AllOtherSegmentsMember_23492f1c-dab8-4f65-b05e-360192a0f137" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_787c6bde-fbcc-484a-9af9-fe7152409579" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_787c6bde-fbcc-484a-9af9-fe7152409579" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_787c6bde-fbcc-484a-9af9-fe7152409579_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_787c6bde-fbcc-484a-9af9-fe7152409579" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_787c6bde-fbcc-484a-9af9-fe7152409579_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_8057d7af-838f-436f-ac92-01fd2d3df680" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_787c6bde-fbcc-484a-9af9-fe7152409579" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_8057d7af-838f-436f-ac92-01fd2d3df680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_1374f3df-ddb9-440b-a410-f699890d3d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_8057d7af-838f-436f-ac92-01fd2d3df680" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_1374f3df-ddb9-440b-a410-f699890d3d8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_804f4176-88b1-4a5c-9497-0790ffff7e46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_804f4176-88b1-4a5c-9497-0790ffff7e46" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_804f4176-88b1-4a5c-9497-0790ffff7e46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_804f4176-88b1-4a5c-9497-0790ffff7e46" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_804f4176-88b1-4a5c-9497-0790ffff7e46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d378d049-0315-4421-8873-45b49fc618aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_804f4176-88b1-4a5c-9497-0790ffff7e46" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d378d049-0315-4421-8873-45b49fc618aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_09c71a39-80ce-43f5-bcb2-f14a509d670b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d378d049-0315-4421-8873-45b49fc618aa" xlink:to="loc_us-gaap_SalesRevenueNetMember_09c71a39-80ce-43f5-bcb2-f14a509d670b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_e5f81cf5-2af1-4b6e-923e-ce9cb865277a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a2c07a3e-d4de-475d-92ae-3fc7d80f7340" xlink:to="loc_srt_MajorCustomersAxis_e5f81cf5-2af1-4b6e-923e-ce9cb865277a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_e5f81cf5-2af1-4b6e-923e-ce9cb865277a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_e5f81cf5-2af1-4b6e-923e-ce9cb865277a" xlink:to="loc_srt_NameOfMajorCustomerDomain_e5f81cf5-2af1-4b6e-923e-ce9cb865277a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_579fa07d-c0ba-4b72-af2f-8d15eb8cfb95" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_e5f81cf5-2af1-4b6e-923e-ce9cb865277a" xlink:to="loc_srt_NameOfMajorCustomerDomain_579fa07d-c0ba-4b72-af2f-8d15eb8cfb95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_UtilitiesMember_3a83fb0d-575e-4554-8650-4f1eaee16130" xlink:href="mtz-20221231.xsd#mtz_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_579fa07d-c0ba-4b72-af2f-8d15eb8cfb95" xlink:to="loc_mtz_UtilitiesMember_3a83fb0d-575e-4554-8650-4f1eaee16130" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentEBITDADetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentEBITDADetails" xlink:type="extended" id="i07d7023385a5466ebfc8acf8cbfe411c_SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentEBITDADetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract_7fa433f1-5151-4c15-8de9-d1a1576f37de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract_7fa433f1-5151-4c15-8de9-d1a1576f37de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EBITDA_cde90ed3-ea7c-4b06-9b3b-0d9dbf50c2c6" xlink:href="mtz-20221231.xsd#mtz_EBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxesAbstract_7fa433f1-5151-4c15-8de9-d1a1576f37de" xlink:to="loc_mtz_EBITDA_cde90ed3-ea7c-4b06-9b3b-0d9dbf50c2c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_16f76de7-8f26-4f8d-823f-0aade726272b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_16f76de7-8f26-4f8d-823f-0aade726272b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_cccb9199-c5db-4d53-85c3-4a49aefe1fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_GainLossOnInvestments_cccb9199-c5db-4d53-85c3-4a49aefe1fa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_4b033bff-4385-415b-9b6c-472da5fdfc21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_4b033bff-4385-415b-9b6c-472da5fdfc21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f3b3e225-d552-4b87-8ee6-7a4dd6596e62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f3b3e225-d552-4b87-8ee6-7a4dd6596e62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_1dac05c3-9cd2-4d92-a7dc-ee0b8c0f8175" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7db1ad82-7103-42b6-ad72-03e21828dd8a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_1dac05c3-9cd2-4d92-a7dc-ee0b8c0f8175" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_a97bbee8-b1ee-4d8b-b638-3973321b611c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_1dac05c3-9cd2-4d92-a7dc-ee0b8c0f8175" xlink:to="loc_srt_ConsolidationItemsAxis_a97bbee8-b1ee-4d8b-b638-3973321b611c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a97bbee8-b1ee-4d8b-b638-3973321b611c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_a97bbee8-b1ee-4d8b-b638-3973321b611c" xlink:to="loc_srt_ConsolidationItemsDomain_a97bbee8-b1ee-4d8b-b638-3973321b611c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_25e00acb-5e2a-4672-905d-c9cf8159fc53" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_a97bbee8-b1ee-4d8b-b638-3973321b611c" xlink:to="loc_srt_ConsolidationItemsDomain_25e00acb-5e2a-4672-905d-c9cf8159fc53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_48db2854-0e83-42e8-b124-0aa2d8300ca9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_25e00acb-5e2a-4672-905d-c9cf8159fc53" xlink:to="loc_us-gaap_OperatingSegmentsMember_48db2854-0e83-42e8-b124-0aa2d8300ca9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_4ac83712-9fea-4e32-88fb-a943496ce426" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_25e00acb-5e2a-4672-905d-c9cf8159fc53" xlink:to="loc_us-gaap_CorporateNonSegmentMember_4ac83712-9fea-4e32-88fb-a943496ce426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_95d87e95-0662-403d-bf03-53fd907ab8c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_1dac05c3-9cd2-4d92-a7dc-ee0b8c0f8175" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_95d87e95-0662-403d-bf03-53fd907ab8c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_95d87e95-0662-403d-bf03-53fd907ab8c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_95d87e95-0662-403d-bf03-53fd907ab8c2" xlink:to="loc_us-gaap_SegmentDomain_95d87e95-0662-403d-bf03-53fd907ab8c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_95d87e95-0662-403d-bf03-53fd907ab8c2" xlink:to="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_3d2bb9c8-3692-4343-8271-9c799a683b5b" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_mtz_CommunicationsMember_3d2bb9c8-3692-4343-8271-9c799a683b5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_e123adae-a7f3-45b5-ac1d-ee410e195417" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_e123adae-a7f3-45b5-ac1d-ee410e195417" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_13d7316d-45cd-441f-8913-547f61a55ebc" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_mtz_OilAndGasSegmentMember_13d7316d-45cd-441f-8913-547f61a55ebc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_26ce000e-17de-4c80-8348-9d1b55b8bc9a" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_mtz_PowerDeliveryMember_26ce000e-17de-4c80-8348-9d1b55b8bc9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_a8c07599-3fcc-485e-b2a3-cf50e5377363" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_us-gaap_AllOtherSegmentsMember_a8c07599-3fcc-485e-b2a3-cf50e5377363" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsSegmentMember_55b4c9ec-8b39-4a9c-a45d-54be70705689" xlink:href="mtz-20221231.xsd#mtz_CommunicationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7a35c12b-e481-42e9-a3a6-aa14af6644ee" xlink:to="loc_mtz_CommunicationsSegmentMember_55b4c9ec-8b39-4a9c-a45d-54be70705689" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_41332038-26f6-43f4-ac62-78dbdf5cccf3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_1dac05c3-9cd2-4d92-a7dc-ee0b8c0f8175" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_41332038-26f6-43f4-ac62-78dbdf5cccf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41332038-26f6-43f4-ac62-78dbdf5cccf3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_41332038-26f6-43f4-ac62-78dbdf5cccf3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41332038-26f6-43f4-ac62-78dbdf5cccf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_edbb769a-3b93-4055-ab6d-a6e2f128663b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_41332038-26f6-43f4-ac62-78dbdf5cccf3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_edbb769a-3b93-4055-ab6d-a6e2f128663b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_d10b131d-5968-4c73-98a0-8de294c8222f" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_edbb769a-3b93-4055-ab6d-a6e2f128663b" xlink:to="loc_mtz_A2021AcquisitionsMember_d10b131d-5968-4c73-98a0-8de294c8222f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentDepreciationandAmortizationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentDepreciationandAmortizationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentDepreciationandAmortizationDetails" xlink:type="extended" id="iae73a9e79caa4a6db012ce631949bfc6_SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentDepreciationandAmortizationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_36e8ab46-ec15-4bfc-ae1c-11ec1848daa5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortizationAbstract_54a3ed43-0e0c-470b-ab6d-6b73e5a0b644" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationAndAmortizationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_36e8ab46-ec15-4bfc-ae1c-11ec1848daa5" xlink:to="loc_us-gaap_DepreciationAndAmortizationAbstract_54a3ed43-0e0c-470b-ab6d-6b73e5a0b644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_c09fd3c4-3c96-4951-baac-b6365e2ee207" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DepreciationAndAmortizationAbstract_54a3ed43-0e0c-470b-ab6d-6b73e5a0b644" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_c09fd3c4-3c96-4951-baac-b6365e2ee207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a77de702-872f-4365-92f0-3d7405460471" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_36e8ab46-ec15-4bfc-ae1c-11ec1848daa5" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a77de702-872f-4365-92f0-3d7405460471" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_05e09d29-31bf-45bd-99f9-31a219f6b5f1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a77de702-872f-4365-92f0-3d7405460471" xlink:to="loc_srt_ConsolidationItemsAxis_05e09d29-31bf-45bd-99f9-31a219f6b5f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_05e09d29-31bf-45bd-99f9-31a219f6b5f1_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_05e09d29-31bf-45bd-99f9-31a219f6b5f1" xlink:to="loc_srt_ConsolidationItemsDomain_05e09d29-31bf-45bd-99f9-31a219f6b5f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3c8a2101-1d7e-47c6-94cd-c4e92021a692" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_05e09d29-31bf-45bd-99f9-31a219f6b5f1" xlink:to="loc_srt_ConsolidationItemsDomain_3c8a2101-1d7e-47c6-94cd-c4e92021a692" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_0610ac72-7304-4e5d-8cc8-f6b0a4584b03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3c8a2101-1d7e-47c6-94cd-c4e92021a692" xlink:to="loc_us-gaap_OperatingSegmentsMember_0610ac72-7304-4e5d-8cc8-f6b0a4584b03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_1951fdb4-dee0-40d3-990a-6e69438f79ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3c8a2101-1d7e-47c6-94cd-c4e92021a692" xlink:to="loc_us-gaap_CorporateNonSegmentMember_1951fdb4-dee0-40d3-990a-6e69438f79ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0d34f980-cb15-423f-a17f-8dd9420ee75c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a77de702-872f-4365-92f0-3d7405460471" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0d34f980-cb15-423f-a17f-8dd9420ee75c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0d34f980-cb15-423f-a17f-8dd9420ee75c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0d34f980-cb15-423f-a17f-8dd9420ee75c" xlink:to="loc_us-gaap_SegmentDomain_0d34f980-cb15-423f-a17f-8dd9420ee75c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0d34f980-cb15-423f-a17f-8dd9420ee75c" xlink:to="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_bed11853-5e4b-4a2b-beec-9bee4510f377" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:to="loc_mtz_CommunicationsMember_bed11853-5e4b-4a2b-beec-9bee4510f377" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_25808345-4bdb-42ac-9f6a-a3f0a0d3cce8" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_25808345-4bdb-42ac-9f6a-a3f0a0d3cce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_416e2f35-9723-462e-a957-b4fd072b2237" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:to="loc_mtz_OilAndGasSegmentMember_416e2f35-9723-462e-a957-b4fd072b2237" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_d30ff2ea-9b42-4734-9155-fe6482cf9ead" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:to="loc_mtz_PowerDeliveryMember_d30ff2ea-9b42-4734-9155-fe6482cf9ead" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_1d8f9a20-e86e-42a9-bd56-e84a36ba42c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b28d5059-0f5f-434e-b00b-0e7b644a3b21" xlink:to="loc_us-gaap_AllOtherSegmentsMember_1d8f9a20-e86e-42a9-bd56-e84a36ba42c9" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentAssetsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentAssetsDetails" xlink:type="extended" id="i2ba0c37f473d495d8c64dfd0e7694c93_SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_6662e1e2-251f-480f-8c97-6425f13f0012" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_47799343-eae3-4c8a-ab5c-64214777e04c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationAdditionalInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_6662e1e2-251f-480f-8c97-6425f13f0012" xlink:to="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_47799343-eae3-4c8a-ab5c-64214777e04c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b16ca1fa-0c83-4958-88e0-0af46bb66dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_47799343-eae3-4c8a-ab5c-64214777e04c" xlink:to="loc_us-gaap_Assets_b16ca1fa-0c83-4958-88e0-0af46bb66dbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_84b7042e-b272-4101-b22f-1ec60b86b844" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_6662e1e2-251f-480f-8c97-6425f13f0012" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_84b7042e-b272-4101-b22f-1ec60b86b844" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_f2f15785-758b-437d-b86f-80d44ec68055" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_84b7042e-b272-4101-b22f-1ec60b86b844" xlink:to="loc_srt_ConsolidationItemsAxis_f2f15785-758b-437d-b86f-80d44ec68055" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_f2f15785-758b-437d-b86f-80d44ec68055_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_f2f15785-758b-437d-b86f-80d44ec68055" xlink:to="loc_srt_ConsolidationItemsDomain_f2f15785-758b-437d-b86f-80d44ec68055_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_e6c00890-c6b1-4488-ab4e-4a6cd46d80b5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_f2f15785-758b-437d-b86f-80d44ec68055" xlink:to="loc_srt_ConsolidationItemsDomain_e6c00890-c6b1-4488-ab4e-4a6cd46d80b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_c008876a-6773-4a26-96e5-a75a6c2c0e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e6c00890-c6b1-4488-ab4e-4a6cd46d80b5" xlink:to="loc_us-gaap_OperatingSegmentsMember_c008876a-6773-4a26-96e5-a75a6c2c0e0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_93763aaa-fad1-4d2e-8440-a5390d77799b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e6c00890-c6b1-4488-ab4e-4a6cd46d80b5" xlink:to="loc_us-gaap_CorporateNonSegmentMember_93763aaa-fad1-4d2e-8440-a5390d77799b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_02abc303-fdb9-4796-8f3b-61b54d98e75d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_84b7042e-b272-4101-b22f-1ec60b86b844" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_02abc303-fdb9-4796-8f3b-61b54d98e75d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_02abc303-fdb9-4796-8f3b-61b54d98e75d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_02abc303-fdb9-4796-8f3b-61b54d98e75d" xlink:to="loc_us-gaap_SegmentDomain_02abc303-fdb9-4796-8f3b-61b54d98e75d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_02abc303-fdb9-4796-8f3b-61b54d98e75d" xlink:to="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_382c671e-8aed-44b4-8eed-6f86afee4b91" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_mtz_CommunicationsMember_382c671e-8aed-44b4-8eed-6f86afee4b91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_2dd43955-238e-457c-8496-ffcb8d77e72c" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_2dd43955-238e-457c-8496-ffcb8d77e72c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_148e4c4d-9818-4ba7-add3-81300223700f" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_mtz_OilAndGasSegmentMember_148e4c4d-9818-4ba7-add3-81300223700f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_33368acb-effe-4356-964b-04bbeb9ba096" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_mtz_PowerDeliveryMember_33368acb-effe-4356-964b-04bbeb9ba096" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_795e7719-5f7a-4e41-955b-e3f7435fd9bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_us-gaap_AllOtherSegmentsMember_795e7719-5f7a-4e41-955b-e3f7435fd9bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsSegmentMember_cd30227e-b9c7-4083-95c1-d5efeaab2f0a" xlink:href="mtz-20221231.xsd#mtz_CommunicationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf11ae68-166c-453d-8884-c56d5c26a7fe" xlink:to="loc_mtz_CommunicationsSegmentMember_cd30227e-b9c7-4083-95c1-d5efeaab2f0a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_f08abce3-1ab4-4daa-b607-768f345e7218" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_84b7042e-b272-4101-b22f-1ec60b86b844" xlink:to="loc_srt_RestatementAxis_f08abce3-1ab4-4daa-b607-768f345e7218" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f08abce3-1ab4-4daa-b607-768f345e7218_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_f08abce3-1ab4-4daa-b607-768f345e7218" xlink:to="loc_srt_RestatementDomain_f08abce3-1ab4-4daa-b607-768f345e7218_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_9decc0c2-ec4f-471c-a551-e6719d1441c4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_f08abce3-1ab4-4daa-b607-768f345e7218" xlink:to="loc_srt_RestatementDomain_9decc0c2-ec4f-471c-a551-e6719d1441c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_b1cd3538-14ba-4d4d-8477-b4d6f1afabe4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_9decc0c2-ec4f-471c-a551-e6719d1441c4" xlink:to="loc_srt_RestatementAdjustmentMember_b1cd3538-14ba-4d4d-8477-b4d6f1afabe4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentCapitalExpendituresDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentCapitalExpendituresDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentCapitalExpendituresDetails" xlink:type="extended" id="i6d59fff2e2204429a9b606c4bcd1b0a5_SegmentsandRelatedInformationScheduleofFinancialInformationbyReportableSegmentCapitalExpendituresDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_6f8c9ceb-dae8-4364-9278-26115b2d49cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_03bf2931-e9e8-418e-9aeb-d6ea7472fc89" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationAdditionalInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_6f8c9ceb-dae8-4364-9278-26115b2d49cd" xlink:to="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_03bf2931-e9e8-418e-9aeb-d6ea7472fc89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_2c8b4f9c-7fb3-41e4-b5bc-2b786f809816" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_03bf2931-e9e8-418e-9aeb-d6ea7472fc89" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_2c8b4f9c-7fb3-41e4-b5bc-2b786f809816" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_055f4e0a-826f-4105-93aa-418ebd62044d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_6f8c9ceb-dae8-4364-9278-26115b2d49cd" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_055f4e0a-826f-4105-93aa-418ebd62044d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_055f4e0a-826f-4105-93aa-418ebd62044d" xlink:to="loc_srt_ConsolidationItemsAxis_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c" xlink:to="loc_srt_ConsolidationItemsDomain_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_bab2d555-8996-489a-9abf-da7097d641f5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_f0f9ca50-6cb7-4ce0-a31d-71f59c230c6c" xlink:to="loc_srt_ConsolidationItemsDomain_bab2d555-8996-489a-9abf-da7097d641f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_8a5f4109-47f6-477c-b5f6-db41bbb5280b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_bab2d555-8996-489a-9abf-da7097d641f5" xlink:to="loc_us-gaap_OperatingSegmentsMember_8a5f4109-47f6-477c-b5f6-db41bbb5280b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_1f467ae0-2962-4108-9de1-505a1b7617c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_bab2d555-8996-489a-9abf-da7097d641f5" xlink:to="loc_us-gaap_CorporateNonSegmentMember_1f467ae0-2962-4108-9de1-505a1b7617c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_055f4e0a-826f-4105-93aa-418ebd62044d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971" xlink:to="loc_us-gaap_SegmentDomain_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_bdc33ed3-c9e6-490c-a93f-d0c2f6aa3971" xlink:to="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CommunicationsMember_52610262-a0e0-4f7b-b9e6-4d19b232fb06" xlink:href="mtz-20221231.xsd#mtz_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:to="loc_mtz_CommunicationsMember_52610262-a0e0-4f7b-b9e6-4d19b232fb06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CleanEnergyAndInfrastructureMember_125c65ac-c101-47bb-8a71-ad98e926fc66" xlink:href="mtz-20221231.xsd#mtz_CleanEnergyAndInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:to="loc_mtz_CleanEnergyAndInfrastructureMember_125c65ac-c101-47bb-8a71-ad98e926fc66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_97b53f1e-4b9b-4f4f-8c25-9f8be2970415" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:to="loc_mtz_OilAndGasSegmentMember_97b53f1e-4b9b-4f4f-8c25-9f8be2970415" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_PowerDeliveryMember_bdaa9be8-9d06-4e73-beff-6c2bd25437f3" xlink:href="mtz-20221231.xsd#mtz_PowerDeliveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:to="loc_mtz_PowerDeliveryMember_bdaa9be8-9d06-4e73-beff-6c2bd25437f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_4413b61b-acfa-4e92-8153-04a4aa9985ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8d284a6a-9f3a-4907-91b3-42b000325f7d" xlink:to="loc_us-gaap_AllOtherSegmentsMember_4413b61b-acfa-4e92-8153-04a4aa9985ad" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationForeignOperationsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationForeignOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationForeignOperationsDetails" xlink:type="extended" id="ie7c6a0c39eef498a87de1764020db660_SegmentsandRelatedInformationForeignOperationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_5904746b-52a5-4dde-a415-601db997ebed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:to="loc_us-gaap_Revenues_5904746b-52a5-4dde-a415-601db997ebed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_d66b07d5-e7fd-4ed1-a379-475e272ccffd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_d66b07d5-e7fd-4ed1-a379-475e272ccffd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_73da5e54-6e0c-4eb5-b699-56d719b66287" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_73da5e54-6e0c-4eb5-b699-56d719b66287" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_7e15a319-6048-473a-9c09-52eb15fab739" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_7e15a319-6048-473a-9c09-52eb15fab739" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_89cf475a-64d1-4d89-88eb-d19af11ee139" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_68374f87-4740-421c-a206-011d17af42b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_68374f87-4740-421c-a206-011d17af42b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68374f87-4740-421c-a206-011d17af42b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_68374f87-4740-421c-a206-011d17af42b0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_68374f87-4740-421c-a206-011d17af42b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aafefbbe-3877-4f8f-9fd5-8a9e5a2ec883" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_68374f87-4740-421c-a206-011d17af42b0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aafefbbe-3877-4f8f-9fd5-8a9e5a2ec883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_e47b7d4f-e912-4a01-952a-ae24abbf26bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aafefbbe-3877-4f8f-9fd5-8a9e5a2ec883" xlink:to="loc_us-gaap_AccountsReceivableMember_e47b7d4f-e912-4a01-952a-ae24abbf26bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_0558dbe6-5245-47bd-b63f-6b74b3386a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aafefbbe-3877-4f8f-9fd5-8a9e5a2ec883" xlink:to="loc_us-gaap_SalesRevenueNetMember_0558dbe6-5245-47bd-b63f-6b74b3386a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b4c90635-b66b-4985-b396-3df32f386823" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b4c90635-b66b-4985-b396-3df32f386823" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b4c90635-b66b-4985-b396-3df32f386823_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b4c90635-b66b-4985-b396-3df32f386823" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b4c90635-b66b-4985-b396-3df32f386823_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_c2f86f44-315a-4147-b89a-85b82cb90e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b4c90635-b66b-4985-b396-3df32f386823" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_c2f86f44-315a-4147-b89a-85b82cb90e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_9f5fd606-94b0-4ada-89c6-6f9cba14be11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_c2f86f44-315a-4147-b89a-85b82cb90e9d" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_9f5fd606-94b0-4ada-89c6-6f9cba14be11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_26c7bde5-fc21-4a67-8aa9-a4e2721bf876" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_c2f86f44-315a-4147-b89a-85b82cb90e9d" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_26c7bde5-fc21-4a67-8aa9-a4e2721bf876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_91e81cbe-b244-484a-9c35-05f35b1fdba7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:to="loc_srt_StatementGeographicalAxis_91e81cbe-b244-484a-9c35-05f35b1fdba7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_91e81cbe-b244-484a-9c35-05f35b1fdba7_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_91e81cbe-b244-484a-9c35-05f35b1fdba7" xlink:to="loc_srt_SegmentGeographicalDomain_91e81cbe-b244-484a-9c35-05f35b1fdba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_43eb9eea-9257-4742-aa6f-1a347e8a1197" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_91e81cbe-b244-484a-9c35-05f35b1fdba7" xlink:to="loc_srt_SegmentGeographicalDomain_43eb9eea-9257-4742-aa6f-1a347e8a1197" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_abdc6770-541e-4513-b1f1-6fcd922c68ef" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_43eb9eea-9257-4742-aa6f-1a347e8a1197" xlink:to="loc_country_US_abdc6770-541e-4513-b1f1-6fcd922c68ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_fa0bccc2-a09f-4175-817f-f7bbd0189184" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_43eb9eea-9257-4742-aa6f-1a347e8a1197" xlink:to="loc_us-gaap_NonUsMember_fa0bccc2-a09f-4175-817f-f7bbd0189184" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_b236a676-f40b-4748-99fe-1f9d9eed9918" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_331fcd82-90ab-4f02-b521-b38db70c259d" xlink:to="loc_srt_MajorCustomersAxis_b236a676-f40b-4748-99fe-1f9d9eed9918" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_b236a676-f40b-4748-99fe-1f9d9eed9918_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_b236a676-f40b-4748-99fe-1f9d9eed9918" xlink:to="loc_srt_NameOfMajorCustomerDomain_b236a676-f40b-4748-99fe-1f9d9eed9918_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_bcc0150e-4ff8-497b-8f80-3d2c8880c255" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_b236a676-f40b-4748-99fe-1f9d9eed9918" xlink:to="loc_srt_NameOfMajorCustomerDomain_bcc0150e-4ff8-497b-8f80-3d2c8880c255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_GovernmentTransactionsMember_ad091565-2104-4af5-a2fa-b19cef2ed827" xlink:href="mtz-20221231.xsd#mtz_GovernmentTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_bcc0150e-4ff8-497b-8f80-3d2c8880c255" xlink:to="loc_mtz_GovernmentTransactionsMember_ad091565-2104-4af5-a2fa-b19cef2ed827" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofSignificantCustomersRevenueConcentrationInformationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#SegmentsandRelatedInformationScheduleofSignificantCustomersRevenueConcentrationInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/SegmentsandRelatedInformationScheduleofSignificantCustomersRevenueConcentrationInformationDetails" xlink:type="extended" id="ia79ed8da95d84c529b77ae2813fe4538_SegmentsandRelatedInformationScheduleofSignificantCustomersRevenueConcentrationInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_af50ce20-0db5-4f71-9d42-37c9c18e40f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_01f8c385-5c97-4161-8c92-a365183b20c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_af50ce20-0db5-4f71-9d42-37c9c18e40f2" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_01f8c385-5c97-4161-8c92-a365183b20c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_648920a6-ae23-4078-b809-ef57718c3dec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_af50ce20-0db5-4f71-9d42-37c9c18e40f2" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_648920a6-ae23-4078-b809-ef57718c3dec" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_648920a6-ae23-4078-b809-ef57718c3dec" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_1de18077-8059-4b17-ba4d-041b37b49be3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_cb7070c5-72a3-4d1e-a3a0-bbd1cd43f314" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_1de18077-8059-4b17-ba4d-041b37b49be3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_164ba346-40ad-4512-8541-1f3a1605dc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1de18077-8059-4b17-ba4d-041b37b49be3" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_164ba346-40ad-4512-8541-1f3a1605dc7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7eb63436-8f76-4801-923d-d0f85cbaa88c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_648920a6-ae23-4078-b809-ef57718c3dec" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7eb63436-8f76-4801-923d-d0f85cbaa88c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7eb63436-8f76-4801-923d-d0f85cbaa88c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7eb63436-8f76-4801-923d-d0f85cbaa88c" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_7eb63436-8f76-4801-923d-d0f85cbaa88c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2350481a-047a-49aa-a2e2-1df0ac3c631e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_7eb63436-8f76-4801-923d-d0f85cbaa88c" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2350481a-047a-49aa-a2e2-1df0ac3c631e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_5ed9dd2c-8a78-4b33-84f7-025a43f02308" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2350481a-047a-49aa-a2e2-1df0ac3c631e" xlink:to="loc_us-gaap_SalesRevenueNetMember_5ed9dd2c-8a78-4b33-84f7-025a43f02308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_ef763ac7-9a8d-4711-88e4-64b16e663fc4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_648920a6-ae23-4078-b809-ef57718c3dec" xlink:to="loc_srt_MajorCustomersAxis_ef763ac7-9a8d-4711-88e4-64b16e663fc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_ef763ac7-9a8d-4711-88e4-64b16e663fc4_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_ef763ac7-9a8d-4711-88e4-64b16e663fc4" xlink:to="loc_srt_NameOfMajorCustomerDomain_ef763ac7-9a8d-4711-88e4-64b16e663fc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_422518e4-dba8-4a53-885b-3b7ac4b2acee" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_ef763ac7-9a8d-4711-88e4-64b16e663fc4" xlink:to="loc_srt_NameOfMajorCustomerDomain_422518e4-dba8-4a53-885b-3b7ac4b2acee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EnbridgeIncMember_cfd704fb-b450-42b0-b106-ed011ef10b51" xlink:href="mtz-20221231.xsd#mtz_EnbridgeIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_422518e4-dba8-4a53-885b-3b7ac4b2acee" xlink:to="loc_mtz_EnbridgeIncMember_cfd704fb-b450-42b0-b106-ed011ef10b51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ATTMember_bce97423-660d-4654-8f6c-07ba22a95d0e" xlink:href="mtz-20221231.xsd#mtz_ATTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_422518e4-dba8-4a53-885b-3b7ac4b2acee" xlink:to="loc_mtz_ATTMember_bce97423-660d-4654-8f6c-07ba22a95d0e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CommitmentsandContingenciesAdditionalInformationDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#CommitmentsandContingenciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CommitmentsandContingenciesAdditionalInformationDetails" xlink:type="extended" id="i75f306b90cfc4fb68dfc1fb4ceffb856_CommitmentsandContingenciesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_e67aa0d8-2bfc-44b0-933d-fb2b7568123f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationSettlementAmountAwardedFromOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_e67aa0d8-2bfc-44b0-933d-fb2b7568123f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_a50ff510-dc02-412d-8c4a-6eddf7252c1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_OtherAssetsCurrent_a50ff510-dc02-412d-8c4a-6eddf7252c1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_c1156ee9-6ce2-4c31-b6b0-b7f48ab003cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_c1156ee9-6ce2-4c31-b6b0-b7f48ab003cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_afb8b4b2-6fe4-4d8e-b765-3e7dbef64c98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SelfInsuranceReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_SelfInsuranceReserve_afb8b4b2-6fe4-4d8e-b765-3e7dbef64c98" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlansPaymentsForWithdrawalObligation_aeb3a885-8ac9-4cd1-adcf-9a5f7b5e03a2" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlansPaymentsForWithdrawalObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_mtz_MultiemployerPlansPaymentsForWithdrawalObligation_aeb3a885-8ac9-4cd1-adcf-9a5f7b5e03a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlansGainLossFromAcquisitions_53eaad51-ef67-45da-bdaa-a9b90b764d99" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlansGainLossFromAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_mtz_MultiemployerPlansGainLossFromAcquisitions_53eaad51-ef67-45da-bdaa-a9b90b764d99" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansWithdrawalObligation_7ad62eb2-80f6-4d80-bf73-24b30606ef66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansWithdrawalObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_MultiemployerPlansWithdrawalObligation_7ad62eb2-80f6-4d80-bf73-24b30606ef66" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_MultiemployerPlansWithdrawalObligationMonthlyPaymentAmount_a972b8ea-78c8-4363-8e1e-d48746324559" xlink:href="mtz-20221231.xsd#mtz_MultiemployerPlansWithdrawalObligationMonthlyPaymentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_mtz_MultiemployerPlansWithdrawalObligationMonthlyPaymentAmount_a972b8ea-78c8-4363-8e1e-d48746324559" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_5040ef57-1a58-47d0-bc3f-6b4f50f117e7" xlink:to="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_498983d4-a46c-44ac-8a9a-1ac37a263e35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_us-gaap_LitigationStatusAxis_498983d4-a46c-44ac-8a9a-1ac37a263e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_498983d4-a46c-44ac-8a9a-1ac37a263e35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_498983d4-a46c-44ac-8a9a-1ac37a263e35" xlink:to="loc_us-gaap_LitigationStatusDomain_498983d4-a46c-44ac-8a9a-1ac37a263e35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_810a2b86-930f-401c-a3eb-cd7a13ba1c18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_498983d4-a46c-44ac-8a9a-1ac37a263e35" xlink:to="loc_us-gaap_LitigationStatusDomain_810a2b86-930f-401c-a3eb-cd7a13ba1c18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SettledLitigationMember_955d8ec2-b21b-4bc0-88ff-4f96e1f99bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SettledLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_810a2b86-930f-401c-a3eb-cd7a13ba1c18" xlink:to="loc_us-gaap_SettledLitigationMember_955d8ec2-b21b-4bc0-88ff-4f96e1f99bd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9c834652-9fdd-471b-9428-2cf18d78001e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_srt_RangeAxis_9c834652-9fdd-471b-9428-2cf18d78001e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9c834652-9fdd-471b-9428-2cf18d78001e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9c834652-9fdd-471b-9428-2cf18d78001e" xlink:to="loc_srt_RangeMember_9c834652-9fdd-471b-9428-2cf18d78001e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1837898b-a743-4988-8a95-14ce64e128ca" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9c834652-9fdd-471b-9428-2cf18d78001e" xlink:to="loc_srt_RangeMember_1837898b-a743-4988-8a95-14ce64e128ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64ff38b0-9c88-4931-8ee9-aa4229d6e599" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1837898b-a743-4988-8a95-14ce64e128ca" xlink:to="loc_srt_MinimumMember_64ff38b0-9c88-4931-8ee9-aa4229d6e599" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0bb3b0cf-f402-4165-ba0c-67133af7cc4a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1837898b-a743-4988-8a95-14ce64e128ca" xlink:to="loc_srt_MaximumMember_0bb3b0cf-f402-4165-ba0c-67133af7cc4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_35c658ab-8d1a-42cc-ac33-433d4aaed94b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_srt_ProductOrServiceAxis_35c658ab-8d1a-42cc-ac33-433d4aaed94b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_35c658ab-8d1a-42cc-ac33-433d4aaed94b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_35c658ab-8d1a-42cc-ac33-433d4aaed94b" xlink:to="loc_srt_ProductsAndServicesDomain_35c658ab-8d1a-42cc-ac33-433d4aaed94b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_65de3dd7-d8cd-4f7d-90d3-3bc373b35c88" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_35c658ab-8d1a-42cc-ac33-433d4aaed94b" xlink:to="loc_srt_ProductsAndServicesDomain_65de3dd7-d8cd-4f7d-90d3-3bc373b35c88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroupPoliciesMember_ca3480a4-0aa1-4793-b3f0-fdf6a8fd2de4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GroupPoliciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_65de3dd7-d8cd-4f7d-90d3-3bc373b35c88" xlink:to="loc_us-gaap_GroupPoliciesMember_ca3480a4-0aa1-4793-b3f0-fdf6a8fd2de4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_11291d4d-c268-4d06-800b-28ae108e07ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_11291d4d-c268-4d06-800b-28ae108e07ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_11291d4d-c268-4d06-800b-28ae108e07ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_11291d4d-c268-4d06-800b-28ae108e07ad" xlink:to="loc_us-gaap_LossContingencyNatureDomain_11291d4d-c268-4d06-800b-28ae108e07ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_0fd9d5a0-dab3-4ccb-b5d5-94f61ae1b070" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_11291d4d-c268-4d06-800b-28ae108e07ad" xlink:to="loc_us-gaap_LossContingencyNatureDomain_0fd9d5a0-dab3-4ccb-b5d5-94f61ae1b070" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UninsuredRiskMember_3f8939ba-c6f1-4196-a5af-28ee07e011c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UninsuredRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_0fd9d5a0-dab3-4ccb-b5d5-94f61ae1b070" xlink:to="loc_us-gaap_UninsuredRiskMember_3f8939ba-c6f1-4196-a5af-28ee07e011c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_ddfa604f-c141-4508-b556-77189951a73a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_ddfa604f-c141-4508-b556-77189951a73a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ddfa604f-c141-4508-b556-77189951a73a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_ddfa604f-c141-4508-b556-77189951a73a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ddfa604f-c141-4508-b556-77189951a73a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_706f51fe-4821-4d61-b4b8-4d0f4c82cf81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_ddfa604f-c141-4508-b556-77189951a73a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_706f51fe-4821-4d61-b4b8-4d0f4c82cf81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_9e1f432e-10d3-4c17-a23a-b234621a60e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_706f51fe-4821-4d61-b4b8-4d0f4c82cf81" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_9e1f432e-10d3-4c17-a23a-b234621a60e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01d223d1-4727-433e-a78e-ceed6cb139e6" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_dei_LegalEntityAxis_01d223d1-4727-433e-a78e-ceed6cb139e6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01d223d1-4727-433e-a78e-ceed6cb139e6_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_01d223d1-4727-433e-a78e-ceed6cb139e6" xlink:to="loc_dei_EntityDomain_01d223d1-4727-433e-a78e-ceed6cb139e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6f033bf0-bb06-402a-9dda-14c9b22391a4" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_01d223d1-4727-433e-a78e-ceed6cb139e6" xlink:to="loc_dei_EntityDomain_6f033bf0-bb06-402a-9dda-14c9b22391a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_InfrastructureEnergyAlternativesIncMember_51356264-f2ca-4828-a0c6-a84c3415e295" xlink:href="mtz-20221231.xsd#mtz_InfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6f033bf0-bb06-402a-9dda-14c9b22391a4" xlink:to="loc_mtz_InfrastructureEnergyAlternativesIncMember_51356264-f2ca-4828-a0c6-a84c3415e295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9b7055e9-48a5-4752-a1f2-068b1fc3d855" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_1fe3586e-fa50-410d-8384-6142d0a4c7ba" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9b7055e9-48a5-4752-a1f2-068b1fc3d855" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9b7055e9-48a5-4752-a1f2-068b1fc3d855_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9b7055e9-48a5-4752-a1f2-068b1fc3d855" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9b7055e9-48a5-4752-a1f2-068b1fc3d855_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5bb420ae-e954-45e8-8005-f7c9e4d3fefc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9b7055e9-48a5-4752-a1f2-068b1fc3d855" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5bb420ae-e954-45e8-8005-f7c9e4d3fefc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_c894af1e-3425-4bd6-a674-4f26d3c188df" xlink:href="mtz-20221231.xsd#mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5bb420ae-e954-45e8-8005-f7c9e4d3fefc" xlink:to="loc_mtz_A2022AcquisitionsInfrastructureEnergyAlternativesIncMember_c894af1e-3425-4bd6-a674-4f26d3c188df" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CommitmentsandContingenciesLegalLettersofCreditBondsSelfInsuranceIndemnitiesDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#CommitmentsandContingenciesLegalLettersofCreditBondsSelfInsuranceIndemnitiesDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CommitmentsandContingenciesLegalLettersofCreditBondsSelfInsuranceIndemnitiesDetails" xlink:type="extended" id="i6b2f2da8831b4ac8b5d21d0bdee7a7e8_CommitmentsandContingenciesLegalLettersofCreditBondsSelfInsuranceIndemnitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_7b4bad5d-168a-4b24-938a-f8c305f0281e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_7b4bad5d-168a-4b24-938a-f8c305f0281e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_188fa6e8-c54c-4f57-a4eb-8887c588ffe5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_188fa6e8-c54c-4f57-a4eb-8887c588ffe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EstimatedCostsToCompleteProjectsSecuredByBonds_5449fcd9-0c07-4242-a730-5771e2569374" xlink:href="mtz-20221231.xsd#mtz_EstimatedCostsToCompleteProjectsSecuredByBonds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_mtz_EstimatedCostsToCompleteProjectsSecuredByBonds_5449fcd9-0c07-4242-a730-5771e2569374" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4588733e-fedc-4c8e-b3e1-f97f7eeebddb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4588733e-fedc-4c8e-b3e1-f97f7eeebddb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_67f70b09-1077-49d6-b704-4e861fbba4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SelfInsuranceReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_SelfInsuranceReserve_67f70b09-1077-49d6-b704-4e861fbba4b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserveNoncurrent_86dda65f-5a9b-4338-a6f4-3697fcf54f31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SelfInsuranceReserveNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_SelfInsuranceReserveNoncurrent_86dda65f-5a9b-4338-a6f4-3697fcf54f31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_54d01b52-3775-4b27-b466-3e1b0220d53e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_54d01b52-3775-4b27-b466-3e1b0220d53e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_5b672313-b883-42df-92f6-4e39afb8e1f9" xlink:to="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_e494c3f6-f22f-4d76-b913-c7ab3640d6bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_e494c3f6-f22f-4d76-b913-c7ab3640d6bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_e494c3f6-f22f-4d76-b913-c7ab3640d6bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_e494c3f6-f22f-4d76-b913-c7ab3640d6bb" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_e494c3f6-f22f-4d76-b913-c7ab3640d6bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_1a0b2f05-2027-4c8f-b9e4-c0db31dbb325" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_e494c3f6-f22f-4d76-b913-c7ab3640d6bb" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_1a0b2f05-2027-4c8f-b9e4-c0db31dbb325" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_71e0b55d-dbf6-46b9-a668-614e4052d6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_1a0b2f05-2027-4c8f-b9e4-c0db31dbb325" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_71e0b55d-dbf6-46b9-a668-614e4052d6b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialStandbyLetterOfCreditMember_41de8b47-9c1c-4446-b07a-068dbe677b41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialStandbyLetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_1a0b2f05-2027-4c8f-b9e4-c0db31dbb325" xlink:to="loc_us-gaap_FinancialStandbyLetterOfCreditMember_41de8b47-9c1c-4446-b07a-068dbe677b41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuretyBondMember_0f0f5ccc-b7ca-48e2-b8ff-e88a222c8e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SuretyBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_1a0b2f05-2027-4c8f-b9e4-c0db31dbb325" xlink:to="loc_us-gaap_SuretyBondMember_0f0f5ccc-b7ca-48e2-b8ff-e88a222c8e2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_b1b00127-42f8-4dbd-a377-8965108601af" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_b1b00127-42f8-4dbd-a377-8965108601af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_b1b00127-42f8-4dbd-a377-8965108601af_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_b1b00127-42f8-4dbd-a377-8965108601af" xlink:to="loc_srt_ConsolidatedEntitiesDomain_b1b00127-42f8-4dbd-a377-8965108601af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_f84a80de-ff9f-4b40-942e-8295c5938a9f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_b1b00127-42f8-4dbd-a377-8965108601af" xlink:to="loc_srt_ConsolidatedEntitiesDomain_f84a80de-ff9f-4b40-942e-8295c5938a9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_9119a62b-09d6-4464-8954-559984ebd9a5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f84a80de-ff9f-4b40-942e-8295c5938a9f" xlink:to="loc_srt_SubsidiariesMember_9119a62b-09d6-4464-8954-559984ebd9a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_c78f35ca-3f24-47be-916e-e55d0bd16917" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_c78f35ca-3f24-47be-916e-e55d0bd16917" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_c78f35ca-3f24-47be-916e-e55d0bd16917_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_c78f35ca-3f24-47be-916e-e55d0bd16917" xlink:to="loc_us-gaap_LossContingencyNatureDomain_c78f35ca-3f24-47be-916e-e55d0bd16917_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_1f1beee2-bc20-45c6-8328-52e19dbeea1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_c78f35ca-3f24-47be-916e-e55d0bd16917" xlink:to="loc_us-gaap_LossContingencyNatureDomain_1f1beee2-bc20-45c6-8328-52e19dbeea1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UninsuredRiskMember_eaea46db-658d-4fa4-b714-3d5c64042e90" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UninsuredRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_1f1beee2-bc20-45c6-8328-52e19dbeea1b" xlink:to="loc_us-gaap_UninsuredRiskMember_eaea46db-658d-4fa4-b714-3d5c64042e90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_dbce674a-3326-4c79-bb34-db76afb30ced" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_srt_ProductOrServiceAxis_dbce674a-3326-4c79-bb34-db76afb30ced" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_dbce674a-3326-4c79-bb34-db76afb30ced_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_dbce674a-3326-4c79-bb34-db76afb30ced" xlink:to="loc_srt_ProductsAndServicesDomain_dbce674a-3326-4c79-bb34-db76afb30ced_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0c30cef3-ac5d-4338-9865-3832559ceba7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_dbce674a-3326-4c79-bb34-db76afb30ced" xlink:to="loc_srt_ProductsAndServicesDomain_0c30cef3-ac5d-4338-9865-3832559ceba7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_56b86b75-8656-46f0-bfad-6572c92d449e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0c30cef3-ac5d-4338-9865-3832559ceba7" xlink:to="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_56b86b75-8656-46f0-bfad-6572c92d449e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroupPoliciesMember_920cc05f-6c9e-44fd-96d5-f094e795d47a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GroupPoliciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0c30cef3-ac5d-4338-9865-3832559ceba7" xlink:to="loc_us-gaap_GroupPoliciesMember_920cc05f-6c9e-44fd-96d5-f094e795d47a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_a725a014-80e3-4047-a9d5-2e37cc683b17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccidentAndHealthInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0c30cef3-ac5d-4338-9865-3832559ceba7" xlink:to="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_a725a014-80e3-4047-a9d5-2e37cc683b17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_2f64e58c-e78a-4807-a6d9-1a275cb3ec51" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_2f64e58c-e78a-4807-a6d9-1a275cb3ec51" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_2f64e58c-e78a-4807-a6d9-1a275cb3ec51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_2f64e58c-e78a-4807-a6d9-1a275cb3ec51" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_2f64e58c-e78a-4807-a6d9-1a275cb3ec51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_bdb0a386-60bb-48a5-9262-f26e4b8ce235" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_2f64e58c-e78a-4807-a6d9-1a275cb3ec51" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_bdb0a386-60bb-48a5-9262-f26e4b8ce235" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_df130e09-d923-4893-b95e-7bfea7a42a8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_bdb0a386-60bb-48a5-9262-f26e4b8ce235" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_df130e09-d923-4893-b95e-7bfea7a42a8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9cf0af9c-2e09-4fe0-9187-2418e415fb68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_b22b27dc-4b5a-4d8b-8e24-943ae8d75ea2" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9cf0af9c-2e09-4fe0-9187-2418e415fb68" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9cf0af9c-2e09-4fe0-9187-2418e415fb68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9cf0af9c-2e09-4fe0-9187-2418e415fb68" xlink:to="loc_us-gaap_RelatedPartyDomain_9cf0af9c-2e09-4fe0-9187-2418e415fb68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e47f74c0-a79e-45cf-a19e-be2a4e4ed7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9cf0af9c-2e09-4fe0-9187-2418e415fb68" xlink:to="loc_us-gaap_RelatedPartyDomain_e47f74c0-a79e-45cf-a19e-be2a4e4ed7f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_0feda3bb-b33b-4397-8702-9e42df9671ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_e47f74c0-a79e-45cf-a19e-be2a4e4ed7f8" xlink:to="loc_us-gaap_CorporateJointVentureMember_0feda3bb-b33b-4397-8702-9e42df9671ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CaptiveInsuranceCompanyMember_673e7d7e-dc17-48d1-8c0f-0447c623eb67" xlink:href="mtz-20221231.xsd#mtz_CaptiveInsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_e47f74c0-a79e-45cf-a19e-be2a4e4ed7f8" xlink:to="loc_mtz_CaptiveInsuranceCompanyMember_673e7d7e-dc17-48d1-8c0f-0447c623eb67" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CommitmentsandContingenciesInvestmentArrangementsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#CommitmentsandContingenciesInvestmentArrangementsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CommitmentsandContingenciesInvestmentArrangementsDetails" xlink:type="extended" id="ic75f8ab9105d42ecb4fbe87d78087902_CommitmentsandContingenciesInvestmentArrangementsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_3c975b08-a971-46a4-a97a-0d79bdab821b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage_d7e9eaf0-0779-44bf-8360-cd6c509226a1" xlink:href="mtz-20221231.xsd#mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3c975b08-a971-46a4-a97a-0d79bdab821b" xlink:to="loc_mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage_d7e9eaf0-0779-44bf-8360-cd6c509226a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfJointVentures_badec644-c7d4-403f-aa90-761c7a45db9a" xlink:href="mtz-20221231.xsd#mtz_NumberOfJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3c975b08-a971-46a4-a97a-0d79bdab821b" xlink:to="loc_mtz_NumberOfJointVentures_badec644-c7d4-403f-aa90-761c7a45db9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForAdvanceToAffiliate_1f30add7-8774-4992-b061-2a02068b4edb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForAdvanceToAffiliate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3c975b08-a971-46a4-a97a-0d79bdab821b" xlink:to="loc_us-gaap_PaymentsForAdvanceToAffiliate_1f30add7-8774-4992-b061-2a02068b4edb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_81d44ee8-c618-4f39-9d5e-45ad78368c63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_3c975b08-a971-46a4-a97a-0d79bdab821b" xlink:to="loc_us-gaap_OtherCommitmentsTable_81d44ee8-c618-4f39-9d5e-45ad78368c63" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ea4dcd2-97e5-4b25-82e4-09f936642592" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_81d44ee8-c618-4f39-9d5e-45ad78368c63" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ea4dcd2-97e5-4b25-82e4-09f936642592" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_2ea4dcd2-97e5-4b25-82e4-09f936642592_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ea4dcd2-97e5-4b25-82e4-09f936642592" xlink:to="loc_us-gaap_RelatedPartyDomain_2ea4dcd2-97e5-4b25-82e4-09f936642592_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_828da0dc-e280-45bd-9dbd-a95ffb8ef108" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ea4dcd2-97e5-4b25-82e4-09f936642592" xlink:to="loc_us-gaap_RelatedPartyDomain_828da0dc-e280-45bd-9dbd-a95ffb8ef108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_1413d8f3-ee53-4812-aa02-183b1559fff8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_828da0dc-e280-45bd-9dbd-a95ffb8ef108" xlink:to="loc_us-gaap_CorporateJointVentureMember_1413d8f3-ee53-4812-aa02-183b1559fff8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_e94757e8-15f2-4d77-8731-370593af4ccd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_81d44ee8-c618-4f39-9d5e-45ad78368c63" xlink:to="loc_srt_OwnershipAxis_e94757e8-15f2-4d77-8731-370593af4ccd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_e94757e8-15f2-4d77-8731-370593af4ccd_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_e94757e8-15f2-4d77-8731-370593af4ccd" xlink:to="loc_srt_OwnershipDomain_e94757e8-15f2-4d77-8731-370593af4ccd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_62dded89-11c8-40d1-8ad5-e01556bdefce" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_e94757e8-15f2-4d77-8731-370593af4ccd" xlink:to="loc_srt_OwnershipDomain_62dded89-11c8-40d1-8ad5-e01556bdefce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_JointVenturesThatProvideElectricalTransmissionInfrastructureServicesMember_c1b3258e-8456-4f41-8e3c-aa22f521dff2" xlink:href="mtz-20221231.xsd#mtz_JointVenturesThatProvideElectricalTransmissionInfrastructureServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_62dded89-11c8-40d1-8ad5-e01556bdefce" xlink:to="loc_mtz_JointVenturesThatProvideElectricalTransmissionInfrastructureServicesMember_c1b3258e-8456-4f41-8e3c-aa22f521dff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_JointVentureCivilConstructionProjectMember_bfe19bfe-4160-41c0-9ffa-3549b9ffe638" xlink:href="mtz-20221231.xsd#mtz_JointVentureCivilConstructionProjectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_62dded89-11c8-40d1-8ad5-e01556bdefce" xlink:to="loc_mtz_JointVentureCivilConstructionProjectMember_bfe19bfe-4160-41c0-9ffa-3549b9ffe638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_10c9ff9f-e13c-4107-be89-23cf992db91d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_81d44ee8-c618-4f39-9d5e-45ad78368c63" xlink:to="loc_srt_RangeAxis_10c9ff9f-e13c-4107-be89-23cf992db91d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_10c9ff9f-e13c-4107-be89-23cf992db91d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_10c9ff9f-e13c-4107-be89-23cf992db91d" xlink:to="loc_srt_RangeMember_10c9ff9f-e13c-4107-be89-23cf992db91d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e397e47f-421d-4d01-99ee-d13b23b32a06" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_10c9ff9f-e13c-4107-be89-23cf992db91d" xlink:to="loc_srt_RangeMember_e397e47f-421d-4d01-99ee-d13b23b32a06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2e635a6d-6563-4c66-8563-84b9afd4e9c9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e397e47f-421d-4d01-99ee-d13b23b32a06" xlink:to="loc_srt_MinimumMember_2e635a6d-6563-4c66-8563-84b9afd4e9c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2cfcff43-8e91-437a-812c-f4ee889e1c98" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e397e47f-421d-4d01-99ee-d13b23b32a06" xlink:to="loc_srt_MaximumMember_2cfcff43-8e91-437a-812c-f4ee889e1c98" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/CommitmentsandContingenciesConcentrationsofRiskDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#CommitmentsandContingenciesConcentrationsofRiskDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/CommitmentsandContingenciesConcentrationsofRiskDetails" xlink:type="extended" id="id26d09249c53415fbe3865f386db4651_CommitmentsandContingenciesConcentrationsofRiskDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_77004c42-01bd-4c7b-9e0f-95276722b68e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfCustomers_bb6e2cb6-8ce4-4a7f-a5cc-9a6b0059549b" xlink:href="mtz-20221231.xsd#mtz_NumberOfCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_77004c42-01bd-4c7b-9e0f-95276722b68e" xlink:to="loc_mtz_NumberOfCustomers_bb6e2cb6-8ce4-4a7f-a5cc-9a6b0059549b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_132f2266-ed5c-4d0c-853e-25260cdb52d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_77004c42-01bd-4c7b-9e0f-95276722b68e" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_132f2266-ed5c-4d0c-853e-25260cdb52d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_dcb13bdf-51a5-409f-823e-2a6e6eb5d6c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_77004c42-01bd-4c7b-9e0f-95276722b68e" xlink:to="loc_us-gaap_ConcentrationRiskTable_dcb13bdf-51a5-409f-823e-2a6e6eb5d6c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_55620718-ec63-4cc0-b94f-da1479b78570" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_dcb13bdf-51a5-409f-823e-2a6e6eb5d6c9" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_55620718-ec63-4cc0-b94f-da1479b78570" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_55620718-ec63-4cc0-b94f-da1479b78570_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_55620718-ec63-4cc0-b94f-da1479b78570" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_55620718-ec63-4cc0-b94f-da1479b78570_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_a129c141-b044-42e7-b046-eb0b6836aa71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_55620718-ec63-4cc0-b94f-da1479b78570" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_a129c141-b044-42e7-b046-eb0b6836aa71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_c7e4ad69-66bc-466a-aa73-b0877b26ef8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_a129c141-b044-42e7-b046-eb0b6836aa71" xlink:to="loc_us-gaap_SalesRevenueNetMember_c7e4ad69-66bc-466a-aa73-b0877b26ef8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_dcb13bdf-51a5-409f-823e-2a6e6eb5d6c9" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_72cb5eeb-4a04-4d20-8853-7b185a920c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_e2a0320a-3f2d-4f00-a3f0-fdb168d6c5ab" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_72cb5eeb-4a04-4d20-8853-7b185a920c8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_d418fd0f-1d4d-4683-9896-970e733ef498" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_72cb5eeb-4a04-4d20-8853-7b185a920c8b" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_d418fd0f-1d4d-4683-9896-970e733ef498" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_dcb13bdf-51a5-409f-823e-2a6e6eb5d6c9" xlink:to="loc_srt_MajorCustomersAxis_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9" xlink:to="loc_srt_NameOfMajorCustomerDomain_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_242c0210-b0d7-49d3-846f-3bed948fcc20" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_66f95e51-0c7d-431c-bfe3-82f9a20cc3c9" xlink:to="loc_srt_NameOfMajorCustomerDomain_242c0210-b0d7-49d3-846f-3bed948fcc20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_TenLargestCustomersMember_91d4f9d8-140f-47da-8634-0af805910902" xlink:href="mtz-20221231.xsd#mtz_TenLargestCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_242c0210-b0d7-49d3-846f-3bed948fcc20" xlink:to="loc_mtz_TenLargestCustomersMember_91d4f9d8-140f-47da-8634-0af805910902" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#RelatedPartyTransactionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="extended" id="id5fe3e4254db4c4980a77c42b1b76a76_RelatedPartyTransactionsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_389c3357-1906-42e4-bc61-bcd82c422b03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_389c3357-1906-42e4-bc61-bcd82c422b03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_9b51434f-0c2e-4f56-ae67-47388a209ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_9b51434f-0c2e-4f56-ae67-47388a209ca4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromRelatedParties_74f97bc0-0161-4fb2-ad7c-78404d303249" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_RevenueFromRelatedParties_74f97bc0-0161-4fb2-ad7c-78404d303249" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableRelatedParties_9e05207a-d599-4245-bf08-b36789fbafa7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_AccountsReceivableRelatedParties_9e05207a-d599-4245-bf08-b36789fbafa7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_8c1993f6-71e5-44f6-959a-62941f5d2496" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_8c1993f6-71e5-44f6-959a-62941f5d2496" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NumberOfManagementMembers_7ab59f43-4015-4109-a721-16fe4f794a8e" xlink:href="mtz-20221231.xsd#mtz_NumberOfManagementMembers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_mtz_NumberOfManagementMembers_7ab59f43-4015-4109-a721-16fe4f794a8e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_308ab864-eb88-4b42-975e-815de58bc1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_308ab864-eb88-4b42-975e-815de58bc1fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_13bfe1be-b2ed-4a79-8021-1d848725b236" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_13bfe1be-b2ed-4a79-8021-1d848725b236" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquityMethodInvestmentRelatedPartyOwnershipPercentage_0488a563-b009-4832-9e3b-f4d5de57bd44" xlink:href="mtz-20221231.xsd#mtz_EquityMethodInvestmentRelatedPartyOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_mtz_EquityMethodInvestmentRelatedPartyOwnershipPercentage_0488a563-b009-4832-9e3b-f4d5de57bd44" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_feddf35c-4b6c-497a-b7f3-39d82fd07df8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_feddf35c-4b6c-497a-b7f3-39d82fd07df8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquityMethodInvestmentNegativeAmount_67d659f7-2488-44fa-9a83-69313598646e" xlink:href="mtz-20221231.xsd#mtz_EquityMethodInvestmentNegativeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_mtz_EquityMethodInvestmentNegativeAmount_67d659f7-2488-44fa-9a83-69313598646e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_c63decc0-960c-484c-9c9b-bd2e56dbe152" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_c63decc0-960c-484c-9c9b-bd2e56dbe152" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForAdvanceToAffiliate_93ae2cc7-5668-41e7-983d-fd680c9e7dc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForAdvanceToAffiliate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_PaymentsForAdvanceToAffiliate_93ae2cc7-5668-41e7-983d-fd680c9e7dc7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage_6f203cc1-6f64-45dc-a00f-d968447490b8" xlink:href="mtz-20221231.xsd#mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage_6f203cc1-6f64-45dc-a00f-d968447490b8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_aba8b800-0d4f-4254-a49d-82a9f37e0f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_aba8b800-0d4f-4254-a49d-82a9f37e0f2a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_NoncontrollingInterestPercentageOfVotingInterestsAcquired_1be1d238-c8b1-4f73-95ec-c13cf6dc28a5" xlink:href="mtz-20221231.xsd#mtz_NoncontrollingInterestPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_mtz_NoncontrollingInterestPercentageOfVotingInterestsAcquired_1be1d238-c8b1-4f73-95ec-c13cf6dc28a5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_88f18d1a-7943-42cd-b0b2-a1dba3e99342" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromPaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_88f18d1a-7943-42cd-b0b2-a1dba3e99342" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f490d2c8-d02f-4aee-a079-53e2a7e337a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f490d2c8-d02f-4aee-a079-53e2a7e337a6" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_5b30d84d-909f-421a-ac69-17965e711c11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_5b30d84d-909f-421a-ac69-17965e711c11" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_6da48f94-2c28-497a-8a52-02239f85d2cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_6da48f94-2c28-497a-8a52-02239f85d2cb" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_aea12d5e-a2ce-4618-9ac8-30124769f0c3" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_aa2da250-4bfc-40bf-8ed3-0da15ef76687" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_aa2da250-4bfc-40bf-8ed3-0da15ef76687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_aa2da250-4bfc-40bf-8ed3-0da15ef76687_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_aa2da250-4bfc-40bf-8ed3-0da15ef76687" xlink:to="loc_us-gaap_RelatedPartyDomain_aa2da250-4bfc-40bf-8ed3-0da15ef76687_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_aa2da250-4bfc-40bf-8ed3-0da15ef76687" xlink:to="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ManagementMember_c4618a24-e8f7-4ed2-a605-a5f69720a496" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:to="loc_srt_ManagementMember_c4618a24-e8f7-4ed2-a605-a5f69720a496" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember_77cba119-a020-490e-91e6-248d0cb1138c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:to="loc_us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember_77cba119-a020-490e-91e6-248d0cb1138c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_BoardOfDirectorsChairmanMember_09f5695b-1866-4ca0-9326-41d995f4496f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_BoardOfDirectorsChairmanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:to="loc_srt_BoardOfDirectorsChairmanMember_09f5695b-1866-4ca0-9326-41d995f4496f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_f6cf8fa1-b0cf-4754-bf02-a2a6fff81030" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:to="loc_srt_ExecutiveOfficerMember_f6cf8fa1-b0cf-4754-bf02-a2a6fff81030" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_debf5f02-5fc9-446c-82aa-304c48a034a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_33a9e9b3-ed1d-46e7-8bff-769967682ef9" xlink:to="loc_us-gaap_CorporateJointVentureMember_debf5f02-5fc9-446c-82aa-304c48a034a9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_f7e8e89a-e9bd-431b-95bc-30840445e8c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_f7e8e89a-e9bd-431b-95bc-30840445e8c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_f7e8e89a-e9bd-431b-95bc-30840445e8c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_f7e8e89a-e9bd-431b-95bc-30840445e8c0" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_f7e8e89a-e9bd-431b-95bc-30840445e8c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_f7e8e89a-e9bd-431b-95bc-30840445e8c0" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_EquipmentSuppliesAndServicesMember_26d464d4-e964-43a2-82fc-c72fcdc2ad1b" xlink:href="mtz-20221231.xsd#mtz_EquipmentSuppliesAndServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:to="loc_mtz_EquipmentSuppliesAndServicesMember_26d464d4-e964-43a2-82fc-c72fcdc2ad1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_782ea92d-7207-4203-a9d2-f2912fde34c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:to="loc_us-gaap_EquipmentMember_782ea92d-7207-4203-a9d2-f2912fde34c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_SubcontractingArrangementsMember_f644bba0-b038-4958-bd2a-06702628e939" xlink:href="mtz-20221231.xsd#mtz_SubcontractingArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:to="loc_mtz_SubcontractingArrangementsMember_f644bba0-b038-4958-bd2a-06702628e939" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAgreementsMember_47c27ee2-523f-4334-95ce-806b7049c945" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:to="loc_us-gaap_LeaseAgreementsMember_47c27ee2-523f-4334-95ce-806b7049c945" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_ConstructionServicesMember_26be31e3-a238-4b9b-8da7-1680bf1a5037" xlink:href="mtz-20221231.xsd#mtz_ConstructionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_a425dbdd-4b0a-48b1-a115-c62026316603" xlink:to="loc_mtz_ConstructionServicesMember_26be31e3-a238-4b9b-8da7-1680bf1a5037" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_53e625ec-6d26-4460-912f-38491e4699e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_806e7c8b-e7c1-4332-a5e3-fff018e9a5bb" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_53e625ec-6d26-4460-912f-38491e4699e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_4299b7ff-1431-45aa-9cbb-065401303383" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_53e625ec-6d26-4460-912f-38491e4699e8" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_4299b7ff-1431-45aa-9cbb-065401303383" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_dd3b6b40-cf27-4556-8105-d99909054109" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_dd3b6b40-cf27-4556-8105-d99909054109" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dd3b6b40-cf27-4556-8105-d99909054109_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dd3b6b40-cf27-4556-8105-d99909054109" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dd3b6b40-cf27-4556-8105-d99909054109_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be8133b0-a18a-4441-adef-02083bc98eef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dd3b6b40-cf27-4556-8105-d99909054109" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be8133b0-a18a-4441-adef-02083bc98eef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2021AcquisitionsMember_5dcec65a-b975-4cb6-932b-91801082abd2" xlink:href="mtz-20221231.xsd#mtz_A2021AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be8133b0-a18a-4441-adef-02083bc98eef" xlink:to="loc_mtz_A2021AcquisitionsMember_5dcec65a-b975-4cb6-932b-91801082abd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_A2023AcquisitionsMember_51104110-86c9-4191-be67-71e6a9b732e2" xlink:href="mtz-20221231.xsd#mtz_A2023AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_be8133b0-a18a-4441-adef-02083bc98eef" xlink:to="loc_mtz_A2023AcquisitionsMember_51104110-86c9-4191-be67-71e6a9b732e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_998df81c-bdf1-4db9-be24-8b41689019c3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_srt_MajorCustomersAxis_998df81c-bdf1-4db9-be24-8b41689019c3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_998df81c-bdf1-4db9-be24-8b41689019c3_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_998df81c-bdf1-4db9-be24-8b41689019c3" xlink:to="loc_srt_NameOfMajorCustomerDomain_998df81c-bdf1-4db9-be24-8b41689019c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_952166ae-cff8-435f-b19f-224c782c7c19" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_998df81c-bdf1-4db9-be24-8b41689019c3" xlink:to="loc_srt_NameOfMajorCustomerDomain_952166ae-cff8-435f-b19f-224c782c7c19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_RelatedCustomerMember_61004d4b-7d8f-416c-9d27-6d7f21bb5839" xlink:href="mtz-20221231.xsd#mtz_RelatedCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_952166ae-cff8-435f-b19f-224c782c7c19" xlink:to="loc_mtz_RelatedCustomerMember_61004d4b-7d8f-416c-9d27-6d7f21bb5839" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_FormerOwnerMember_b5c2542d-9411-4a1d-8d93-abaff9dd46a9" xlink:href="mtz-20221231.xsd#mtz_FormerOwnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_952166ae-cff8-435f-b19f-224c782c7c19" xlink:to="loc_mtz_FormerOwnerMember_b5c2542d-9411-4a1d-8d93-abaff9dd46a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_78f63478-bd00-43b3-8282-3d79fc82d728" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_78f63478-bd00-43b3-8282-3d79fc82d728" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_78f63478-bd00-43b3-8282-3d79fc82d728_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_78f63478-bd00-43b3-8282-3d79fc82d728" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_78f63478-bd00-43b3-8282-3d79fc82d728_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_2e51a8b6-5b0e-442b-bbab-2dbac83bc130" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_78f63478-bd00-43b3-8282-3d79fc82d728" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_2e51a8b6-5b0e-442b-bbab-2dbac83bc130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CrossCountryInfrastructureMember_54a89257-3c7f-4354-969f-e2bdee983a2b" xlink:href="mtz-20221231.xsd#mtz_CrossCountryInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_2e51a8b6-5b0e-442b-bbab-2dbac83bc130" xlink:to="loc_mtz_CrossCountryInfrastructureMember_54a89257-3c7f-4354-969f-e2bdee983a2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6d6c601a-a507-4644-a1a7-8a5973378866" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9a8b6ce5-fb69-44ea-a1bf-1b467ce28786" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6d6c601a-a507-4644-a1a7-8a5973378866" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_1ef172d0-8801-4a06-9cb3-99dcdb235d15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6d6c601a-a507-4644-a1a7-8a5973378866" xlink:to="loc_us-gaap_LineOfCreditMember_1ef172d0-8801-4a06-9cb3-99dcdb235d15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_a9f85b02-9c0e-4a9b-9074-ed276907b214" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_srt_OwnershipAxis_a9f85b02-9c0e-4a9b-9074-ed276907b214" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_a9f85b02-9c0e-4a9b-9074-ed276907b214_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_a9f85b02-9c0e-4a9b-9074-ed276907b214" xlink:to="loc_srt_OwnershipDomain_a9f85b02-9c0e-4a9b-9074-ed276907b214_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_d5f1b20c-4384-4bb7-9dd4-9bc46d31f329" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_a9f85b02-9c0e-4a9b-9074-ed276907b214" xlink:to="loc_srt_OwnershipDomain_d5f1b20c-4384-4bb7-9dd4-9bc46d31f329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_CanadianJointVentureMember_530e06b2-1bb7-4df0-9c66-564d7d9901ee" xlink:href="mtz-20221231.xsd#mtz_CanadianJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_d5f1b20c-4384-4bb7-9dd4-9bc46d31f329" xlink:to="loc_mtz_CanadianJointVentureMember_530e06b2-1bb7-4df0-9c66-564d7d9901ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1c611bdf-2464-4e21-99b6-dbdfae988a15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1c611bdf-2464-4e21-99b6-dbdfae988a15" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1c611bdf-2464-4e21-99b6-dbdfae988a15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1c611bdf-2464-4e21-99b6-dbdfae988a15" xlink:to="loc_us-gaap_SegmentDomain_1c611bdf-2464-4e21-99b6-dbdfae988a15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_604460c4-f934-4bf6-a8fc-8cab102fff4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1c611bdf-2464-4e21-99b6-dbdfae988a15" xlink:to="loc_us-gaap_SegmentDomain_604460c4-f934-4bf6-a8fc-8cab102fff4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_OilAndGasSegmentMember_9925dd3e-e5be-4d9b-ae3f-71c5e45740cc" xlink:href="mtz-20221231.xsd#mtz_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_604460c4-f934-4bf6-a8fc-8cab102fff4a" xlink:to="loc_mtz_OilAndGasSegmentMember_9925dd3e-e5be-4d9b-ae3f-71c5e45740cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_142baa16-c36e-49c6-baf2-813eeb346bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_dbde861f-e65a-4ad7-a68c-f728da3cb37c" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_142baa16-c36e-49c6-baf2-813eeb346bb7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_142baa16-c36e-49c6-baf2-813eeb346bb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_142baa16-c36e-49c6-baf2-813eeb346bb7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_142baa16-c36e-49c6-baf2-813eeb346bb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_2d6b9ad0-e68b-4d94-b4a4-6db1696033aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_142baa16-c36e-49c6-baf2-813eeb346bb7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_2d6b9ad0-e68b-4d94-b4a4-6db1696033aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_76a06af8-a16d-4731-a143-9d3cb5af2fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_2d6b9ad0-e68b-4d94-b4a4-6db1696033aa" xlink:to="loc_us-gaap_SubsequentEventMember_76a06af8-a16d-4731-a143-9d3cb5af2fc4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/RelatedPartyTransactionsSplitDollarAgreementsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#RelatedPartyTransactionsSplitDollarAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/RelatedPartyTransactionsSplitDollarAgreementsDetails" xlink:type="extended" id="i295e2890ad5843299854a1475a28bc9f_RelatedPartyTransactionsSplitDollarAgreementsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_09911dd5-d082-43ff-af09-bf8cc380dbb0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_a6e6a460-1981-4980-ac22-72b7e13a4064" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LifeInsuranceCorporateOrBankOwnedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_09911dd5-d082-43ff-af09-bf8cc380dbb0" xlink:to="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_a6e6a460-1981-4980-ac22-72b7e13a4064" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireLifeInsurancePolicies_5a3cbf43-fa6e-4527-89cb-ecc2423a4fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireLifeInsurancePolicies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_09911dd5-d082-43ff-af09-bf8cc380dbb0" xlink:to="loc_us-gaap_PaymentsToAcquireLifeInsurancePolicies_5a3cbf43-fa6e-4527-89cb-ecc2423a4fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueOfLifeInsurance_0db0feda-1885-4efc-8a97-ee6d35d28819" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashSurrenderValueOfLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_09911dd5-d082-43ff-af09-bf8cc380dbb0" xlink:to="loc_us-gaap_CashSurrenderValueOfLifeInsurance_0db0feda-1885-4efc-8a97-ee6d35d28819" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_635625a5-4d2f-4491-b777-8f1c1877bfc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_09911dd5-d082-43ff-af09-bf8cc380dbb0" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_635625a5-4d2f-4491-b777-8f1c1877bfc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_635625a5-4d2f-4491-b777-8f1c1877bfc6" xlink:to="loc_srt_RangeAxis_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9" xlink:to="loc_srt_RangeMember_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f15e7eb5-98c8-4969-94c1-de87bcbe24a1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1adaa8c6-52c0-4142-9f4c-dd6ff21d22b9" xlink:to="loc_srt_RangeMember_f15e7eb5-98c8-4969-94c1-de87bcbe24a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b1dc6227-9ee9-4dd3-b1c2-c8c0144b9f15" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f15e7eb5-98c8-4969-94c1-de87bcbe24a1" xlink:to="loc_srt_MaximumMember_b1dc6227-9ee9-4dd3-b1c2-c8c0144b9f15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_bf9586e0-9d36-4b52-abfb-c76a3ad22017" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_635625a5-4d2f-4491-b777-8f1c1877bfc6" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_bf9586e0-9d36-4b52-abfb-c76a3ad22017" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_bf9586e0-9d36-4b52-abfb-c76a3ad22017_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_bf9586e0-9d36-4b52-abfb-c76a3ad22017" xlink:to="loc_us-gaap_RelatedPartyDomain_bf9586e0-9d36-4b52-abfb-c76a3ad22017_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_4f8e1d5c-a9b6-4a19-ab0a-31ceb082a388" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_bf9586e0-9d36-4b52-abfb-c76a3ad22017" xlink:to="loc_us-gaap_RelatedPartyDomain_4f8e1d5c-a9b6-4a19-ab0a-31ceb082a388" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_BoardOfDirectorsChairmanMember_2df8b7fe-8967-461c-9a73-2caf2da78bb5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_BoardOfDirectorsChairmanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_4f8e1d5c-a9b6-4a19-ab0a-31ceb082a388" xlink:to="loc_srt_BoardOfDirectorsChairmanMember_2df8b7fe-8967-461c-9a73-2caf2da78bb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_241fd46a-a5a6-4b4c-a2ec-c9fe76136b9e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_4f8e1d5c-a9b6-4a19-ab0a-31ceb082a388" xlink:to="loc_srt_ChiefExecutiveOfficerMember_241fd46a-a5a6-4b4c-a2ec-c9fe76136b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_7e6ceb3c-42af-40d8-aefe-3fc499c3264b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_4f8e1d5c-a9b6-4a19-ab0a-31ceb082a388" xlink:to="loc_srt_ExecutiveOfficerMember_7e6ceb3c-42af-40d8-aefe-3fc499c3264b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mastec.com/role/ScheduleIIValuationandQualifyingAccountsDetails" xlink:type="simple" xlink:href="mtz-20221231.xsd#ScheduleIIValuationandQualifyingAccountsDetails"/>
  <link:definitionLink xlink:role="http://www.mastec.com/role/ScheduleIIValuationandQualifyingAccountsDetails" xlink:type="extended" id="i86d1d8f2d0ee4b25a6a86db07368da8d_ScheduleIIValuationandQualifyingAccountsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_9e016c77-d4d8-4345-b961-6c0fda359197" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_9e016c77-d4d8-4345-b961-6c0fda359197" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_6f19acd5-d31b-4015-9aa7-32f460e9708d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_6f19acd5-d31b-4015-9aa7-32f460e9708d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_7bf912c5-4c07-4bbf-a943-9a20e9c531ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_7bf912c5-4c07-4bbf-a943-9a20e9c531ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_3f147e61-56af-4c82-b480-f82ea3cd31e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_3f147e61-56af-4c82-b480-f82ea3cd31e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_7034eae6-5dad-4617-9f50-4fc2495f9fdc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_b87302fb-6637-4756-a578-481ad05c5c1d" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_7034eae6-5dad-4617-9f50-4fc2495f9fdc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_d42bc796-8925-4e6c-a407-4a0272d5f219" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a100d73a-939f-457a-91d7-d63794ddbe55" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_9e016c77-d4d8-4345-b961-6c0fda359197" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a100d73a-939f-457a-91d7-d63794ddbe55" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_58c48364-89b0-41bb-b573-a60f3c8e9285" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a100d73a-939f-457a-91d7-d63794ddbe55" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_58c48364-89b0-41bb-b573-a60f3c8e9285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_58c48364-89b0-41bb-b573-a60f3c8e9285_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_58c48364-89b0-41bb-b573-a60f3c8e9285" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_58c48364-89b0-41bb-b573-a60f3c8e9285_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_58c48364-89b0-41bb-b573-a60f3c8e9285" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_970d1a73-defb-4ebd-9b96-9957c3340e31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForCreditLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_970d1a73-defb-4ebd-9b96-9957c3340e31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtz_AllowanceForUnbilledReceivablesAndProjectCloseOutLiabilitiesMember_5f99ce8e-2575-4a98-bec4-55acaa489f8b" xlink:href="mtz-20221231.xsd#mtz_AllowanceForUnbilledReceivablesAndProjectCloseOutLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:to="loc_mtz_AllowanceForUnbilledReceivablesAndProjectCloseOutLiabilitiesMember_5f99ce8e-2575-4a98-bec4-55acaa489f8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryValuationReserveMember_ea6897ed-7ed2-4ea9-adc5-f1c7a7a6ebd8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryValuationReserveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:to="loc_us-gaap_InventoryValuationReserveMember_ea6897ed-7ed2-4ea9-adc5-f1c7a7a6ebd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_6d5410e4-af76-4a9d-a288-a7a6d579429a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_45832e38-7bc2-4822-9eff-6ba5a1801b10" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_6d5410e4-af76-4a9d-a288-a7a6d579429a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
