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  <xs:element id="mtz_MultiemployerPlanQuarterlyExpectedFutureBenefitPayment" abstract="false" name="MultiemployerPlanQuarterlyExpectedFutureBenefitPayment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_ThirdQuarterSettlementMember" abstract="true" name="ThirdQuarterSettlementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_LesseeLeaseRenewalTerm" abstract="false" name="LesseeLeaseRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mtz_NumberOfCustomers" abstract="false" name="NumberOfCustomers" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mtz_CleanEnergyAndInfrastructureSegmentMember" abstract="true" name="CleanEnergyAndInfrastructureSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ContingentConsiderationCollectionOfAcquiredReceivablesMember" abstract="true" name="ContingentConsiderationCollectionOfAcquiredReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_EquityMethodInvestmentNegativeAmount" abstract="false" name="EquityMethodInvestmentNegativeAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesLongTermDebtIncludingLeaseObligations" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesLongTermDebtIncludingLeaseObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_ConfluenceMember" abstract="true" name="ConfluenceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_CommunityCondotteDeMoyaJVLLCMember" abstract="true" name="CommunityCondotteDeMoyaJVLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_EstimatedCostsToCompleteProjectsSecuredByBonds" abstract="false" name="EstimatedCostsToCompleteProjectsSecuredByBonds" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_LesseeLeaseTermOfContract" abstract="false" name="LesseeLeaseTermOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mtz_PowerDeliverySegmentMember" abstract="true" name="PowerDeliverySegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2021AcquisitionAcquisitionOneMember" abstract="true" name="A2021AcquisitionAcquisitionOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_FinanceLeaseAndOtherObligations" abstract="false" name="FinanceLeaseAndOtherObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_ScheduleOfIntangibleAssetsTable" abstract="true" name="ScheduleOfIntangibleAssetsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="mtz_OilAndGasSegmentMember" abstract="true" name="OilAndGasSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_MobilizationCostsMember" abstract="true" name="MobilizationCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_EquityInvestmentOwnershipPercentage" abstract="false" name="EquityInvestmentOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_NumberOfJointVentures" abstract="false" name="NumberOfJointVentures" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mtz_MandatorilyRedeemableStockMember" abstract="true" name="MandatorilyRedeemableStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_EnbridgeIncMember" abstract="true" name="EnbridgeIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2021AcquisitionsHenkelsMcCoyGroupIncMember" abstract="true" name="A2021AcquisitionsHenkelsMcCoyGroupIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2021AcquisitionsMember" abstract="true" name="A2021AcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_IntangibleAssetsLineItems" abstract="true" name="IntangibleAssetsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="mtz_TenLargestCustomersMember" abstract="true" name="TenLargestCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_AcquisitionsGoodwillAndIntangibleAssetsDisclosureTextBlock" abstract="false" name="AcquisitionsGoodwillAndIntangibleAssetsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="mtz_EquipmentSuppliesAndServicesMember" abstract="true" name="EquipmentSuppliesAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage" abstract="false" name="ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_A2021AcquisitionAcquisitionThreeMember" abstract="true" name="A2021AcquisitionAcquisitionThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_SubcontractingArrangementsMember" abstract="true" name="SubcontractingArrangementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2021AcquisitionsHenkelsMcCoyGroupIncAndINTRENMember" abstract="true" name="A2021AcquisitionsHenkelsMcCoyGroupIncAndINTRENMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_HenkelsMcCoyGroupIncMember" abstract="true" name="HenkelsMcCoyGroupIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ForeignDenominationMember" abstract="true" name="ForeignDenominationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ContractRetainage" abstract="false" name="ContractRetainage" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_RestrictedStockAndRestrictedStockUnitsMember" abstract="true" name="RestrictedStockAndRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_IntangibleAssetsExcludingGoodwillPurchaseAccountingAdjustments" abstract="false" name="IntangibleAssetsExcludingGoodwillPurchaseAccountingAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_AllAcquisitionsMember" abstract="true" name="AllAcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_CommunicationsSegmentMember" abstract="true" name="CommunicationsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval" abstract="false" name="UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mtz_ContractWithCustomerLiabilityDeferredRevenueCurrent" abstract="false" name="ContractWithCustomerLiabilityDeferredRevenueCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_A2021AcquisitionsAllOtherMember" abstract="true" name="A2021AcquisitionsAllOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2021AcquisitionsAcquisitionTwoMember" abstract="true" name="A2021AcquisitionsAcquisitionTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_CaptiveInsuranceCompanyMember" abstract="true" name="CaptiveInsuranceCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_BeneficialOwnershipInterestPercentage" abstract="false" name="BeneficialOwnershipInterestPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_AVCTMember" abstract="true" name="AVCTMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_CrossCountryInfrastructureMember" abstract="true" name="CrossCountryInfrastructureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ContingentConsiderationMember" abstract="true" name="ContingentConsiderationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_LesseeLeaseLeaseNotYetCommencedTermOfContract" abstract="false" name="LesseeLeaseLeaseNotYetCommencedTermOfContract" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mtz_BusinessCombinationIntegrationRelatedLiabilities" abstract="false" name="BusinessCombinationIntegrationRelatedLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_LongTermDebtAndFinanceLeaseObligationsIncludingCurrentMaturitiesGross" abstract="false" name="LongTermDebtAndFinanceLeaseObligationsIncludingCurrentMaturitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_WahaJVsMember" abstract="true" name="WahaJVsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2022AcquisitionsMember" abstract="true" name="A2022AcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage" abstract="false" name="ProportionatelyConsolidatedJointVentureOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_UtilitiesMember" abstract="true" name="UtilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_FourPointFivePercentSeniorNotesMember" abstract="true" name="FourPointFivePercentSeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_IntangibleAssetsAcquiredGrossExcludingGoodwill" abstract="false" name="IntangibleAssetsAcquiredGrossExcludingGoodwill" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_EmployeeLeasingAndAdvancedReceivableArrangementMember" abstract="true" name="EmployeeLeasingAndAdvancedReceivableArrangementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
