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  <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_ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectFromMarginIncreasesDecreases" abstract="false" name="ChangesInContractEstimatesCostToCostMeasureOfProgressFinancialEffectFromMarginIncreasesDecreases" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_FormerOwnerOfAcquiredBusinessMember" abstract="true" name="FormerOwnerOfAcquiredBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_A2023AcquisitionsMember" abstract="true" name="A2023AcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_SixPointSixTwoFivePercentSeniorNotesMember" abstract="true" name="SixPointSixTwoFivePercentSeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_GoodwillImpairmentTestingMeasurementInput" abstract="false" name="GoodwillImpairmentTestingMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="mtz_ConfluenceMember" abstract="true" name="ConfluenceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_EmployeeLeasingExpenseArrangementMember" abstract="true" name="EmployeeLeasingExpenseArrangementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_A2022TermLoansMember" abstract="true" name="A2022TermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_UtilitiesMember" abstract="true" name="UtilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_RetainagePercentOfContractBillings" abstract="false" name="RetainagePercentOfContractBillings" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="mtz_NewTermLoanFacilityThreeYearTrancheMember" abstract="true" name="NewTermLoanFacilityThreeYearTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_DebtInstrumentQuarterlyInstallments" abstract="false" name="DebtInstrumentQuarterlyInstallments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_DisposalGroupIncludingDiscontinuedOperationsPercentageOfOwnershipInterestSold" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsPercentageOfOwnershipInterestSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_EmployeeLeasingAndAdvancedReceivableArrangementMember" abstract="true" name="EmployeeLeasingAndAdvancedReceivableArrangementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_PerformanceObligationTimingOfRecognitionAxis" abstract="true" name="PerformanceObligationTimingOfRecognitionAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="mtz_SubcontractingArrangementTwoMember" abstract="true" name="SubcontractingArrangementTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_FinancingReceivableInterestRate" abstract="false" name="FinancingReceivableInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mtz_EarnoutArrangementsMember" abstract="true" name="EarnoutArrangementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" abstract="false" name="FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="mtz_NewTermLoanFacilityMember" abstract="true" name="NewTermLoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_JointVenturesThatProvideElectricalTransmissionInfrastructureServicesMember" abstract="true" name="JointVenturesThatProvideElectricalTransmissionInfrastructureServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_PerformanceObligationTimingOfRecognitionDomain" abstract="true" name="PerformanceObligationTimingOfRecognitionDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_OilAndGasSegmentMember" abstract="true" name="OilAndGasSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_BusinessCombinationsContingentConsiderationUnrealizedGainLoss" abstract="false" name="BusinessCombinationsContingentConsiderationUnrealizedGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_RightOfUseAssetObtainedInExchangeForFinanceLeaseAndOtherFinancingArrangementsLiability" abstract="false" name="RightOfUseAssetObtainedInExchangeForFinanceLeaseAndOtherFinancingArrangementsLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_RelatedCustomerMember" abstract="true" name="RelatedCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_InfrastructureEnergyAlternativesInc.Member" abstract="true" name="InfrastructureEnergyAlternativesInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_ContingentConsiderationCollectionsFromAcquiredReceivablesMember" abstract="true" name="ContingentConsiderationCollectionsFromAcquiredReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_AllAcquisitionsMember" abstract="true" name="AllAcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_CaptiveInsuranceCompanyMember" abstract="true" name="CaptiveInsuranceCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_CommunicationsMember" abstract="true" name="CommunicationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis" abstract="true" name="FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="mtz_CustomersRepresenting10OrMoreOfCompanyMember" abstract="true" name="CustomersRepresenting10OrMoreOfCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_NumberOfYearsOfDiscountedCashFlowsMember" abstract="true" name="NumberOfYearsOfDiscountedCashFlowsMember" 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-types1:domainItemType"/>
  <xs:element id="mtz_ReportingUnitNotSubstantiallyExceedingCarryingAmountNumber" abstract="false" name="ReportingUnitNotSubstantiallyExceedingCarryingAmountNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mtz_EquipmentCompanyAcquisitionTwoMember" abstract="true" name="EquipmentCompanyAcquisitionTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_AccountsPayableAfterAllowanceForCreditLoss" abstract="false" name="AccountsPayableAfterAllowanceForCreditLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mtz_LesseeLeaseRenewalTerm" abstract="false" name="LesseeLeaseRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mtz_PerformanceObligationConcentrationRiskMember" abstract="true" name="PerformanceObligationConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mtz_NewTermLoanFacilityFiveYearTrancheMember" abstract="true" name="NewTermLoanFacilityFiveYearTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain" abstract="true" name="FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_NoncontrollingInterestPercentageOfVotingInterestsAcquired" abstract="false" name="NoncontrollingInterestPercentageOfVotingInterestsAcquired" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="mtz_EquipmentSuppliesAndServicesMember" abstract="true" name="EquipmentSuppliesAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_RestrictedStockAndRestrictedStockUnitsMember" abstract="true" name="RestrictedStockAndRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_JointVentureCivilConstructionProjectMember" abstract="true" name="JointVentureCivilConstructionProjectMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_ForeignDenominationMember" abstract="true" name="ForeignDenominationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_AdvancedReceivableArrangementMember" abstract="true" name="AdvancedReceivableArrangementMember" 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_ContractRetainage" abstract="false" name="ContractRetainage" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" 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-types1:domainItemType"/>
  <xs:element id="mtz_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsShares" abstract="false" name="NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="mtz_ConstructionServicesMember" abstract="true" name="ConstructionServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="mtz_ProportionatelyConsolidatedJointVentureOwnershipPercentage" abstract="false" name="ProportionatelyConsolidatedJointVentureOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
</xs:schema>
