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  <xs:element id="mtz_CleanEnergyAndInfrastructureMember" abstract="true" name="CleanEnergyAndInfrastructureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_NumberOfManagementMembers" abstract="false" name="NumberOfManagementMembers" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <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_FinanceLeaseAndOtherObligations" abstract="false" name="FinanceLeaseAndOtherObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval" abstract="false" name="UnapprovedChangeOrdersAndOrClaimsExpectedTermForApproval" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_LongtermDebtandFinanceLeaseObligationsIncludingCurrentMaturitiesGross" abstract="false" name="LongtermDebtandFinanceLeaseObligationsIncludingCurrentMaturitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_EquipmentLeasesMember" abstract="true" name="EquipmentLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_TenLargestCustomers1Member" abstract="true" name="TenLargestCustomers1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ScheduleOfIntangibleAssetsTable" abstract="true" name="ScheduleOfIntangibleAssetsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="mtz_CustomerBMember" abstract="true" name="CustomerBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_CustomerRelationshipsAndTradeNamesMember" abstract="true" name="CustomerRelationshipsAndTradeNamesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_ATT1Member" abstract="true" name="ATT1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_NumberOfJointVentures" abstract="false" name="NumberOfJointVentures" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mtz_EquityInvestmentWithoutReadilyDeterminableFairValueOwnershipPercentage" abstract="false" name="EquityInvestmentWithoutReadilyDeterminableFairValueOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <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_BeneficialOwnershipInterestPercentage" abstract="false" name="BeneficialOwnershipInterestPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_LesseeOperatingLeaseLiabilityTobePaidafterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityTobePaidafterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_ConstructionManagementFirmSpecializingInSteelBuildingSystemsMember" abstract="true" name="ConstructionManagementFirmSpecializingInSteelBuildingSystemsMember" 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_AllAcquisitionsMember" abstract="true" name="AllAcquisitionsMember" 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_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_EBITDA" abstract="false" name="EBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_FacilityLeasesMember" abstract="true" name="FacilityLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_UnusualOrInfrequentItemsOrBothPolicyTextBlock" abstract="false" name="UnusualOrInfrequentItemsOrBothPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <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_IntangibleAssetsAcquiredGrossExcludingGoodwill" abstract="false" name="IntangibleAssetsAcquiredGrossExcludingGoodwill" nillable="true" xbrli:periodType="duration" 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_NumberOfCustomers1" abstract="false" name="NumberOfCustomers1" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mtz_NoncontrollingInterestPercentageOfVotingInterestsAcquired" abstract="false" name="NoncontrollingInterestPercentageOfVotingInterestsAcquired" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_JointVentureCivilConstructionProjectMemberDomain" abstract="true" name="JointVentureCivilConstructionProjectMemberDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments" abstract="false" name="IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_FourPointEightSevenFivePercentSeniorNotesMember" abstract="true" name="FourPointEightSevenFivePercentSeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_FinanceLeaseLiabilityTobePaidafterYearFour" abstract="false" name="FinanceLeaseLiabilityTobePaidafterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_TelecommunicationsEquityMethodInvesteesMember" abstract="true" name="TelecommunicationsEquityMethodInvesteesMember" 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_GovermmentTransactionsMember" abstract="true" name="GovermmentTransactionsMember" 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_CleanEnergyAndInfrastructureAndCommunicationsMember" abstract="true" name="CleanEnergyAndInfrastructureAndCommunicationsMember" 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_IntangibleAssetsLineItems" abstract="true" name="IntangibleAssetsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="mtz_RetainagePercentOfContractBillings" abstract="false" name="RetainagePercentOfContractBillings" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <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_CommunicationsAndEnergyInfrastructureMember" abstract="true" name="CommunicationsAndEnergyInfrastructureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_InstallToHomeMember" abstract="true" name="InstallToHomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
