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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:3197857a-85c2-47fc-a6ba-0f13c291b42b,g:65456397-6bac-4ba4-8da6-4b367465beea-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:mli="http://www.muellerindustries.com/20250927" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.muellerindustries.com/20250927">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mli-20250927_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mli-20250927_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mli-20250927_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="mli-20250927_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.muellerindustries.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEUnaudited" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEUnaudited">
        <link:definition>9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnaudited" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnaudited">
        <link:definition>9952152 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnauditedParenthetical" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUnauditedParenthetical">
        <link:definition>9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETS" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS">
        <link:definition>9952154 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952155 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS - (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited">
        <link:definition>9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUnaudited" roleURI="http://www.muellerindustries.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUnaudited">
        <link:definition>9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingStandards" roleURI="http://www.muellerindustries.com/role/RecentAccountingStandards">
        <link:definition>9952158 - Disclosure - Recent Accounting Standards</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsperCommonShare" roleURI="http://www.muellerindustries.com/role/EarningsperCommonShare">
        <link:definition>9952159 - Disclosure - Earnings per Common Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Acquisitions" roleURI="http://www.muellerindustries.com/role/Acquisitions">
        <link:definition>9952160 - Disclosure - Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://www.muellerindustries.com/role/SegmentInformation">
        <link:definition>9952161 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashCashEquivalentsandRestrictedCash" roleURI="http://www.muellerindustries.com/role/CashCashEquivalentsandRestrictedCash">
        <link:definition>9952162 - Disclosure - Cash, Cash Equivalents, and Restricted Cash</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.muellerindustries.com/role/Inventories">
        <link:definition>9952163 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstruments" roleURI="http://www.muellerindustries.com/role/FinancialInstruments">
        <link:definition>9952164 - Disclosure - Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedAffiliates" roleURI="http://www.muellerindustries.com/role/InvestmentsinUnconsolidatedAffiliates">
        <link:definition>9952165 - Disclosure - Investments in Unconsolidated Affiliates</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlans" roleURI="http://www.muellerindustries.com/role/BenefitPlans">
        <link:definition>9952166 - Disclosure - Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.muellerindustries.com/role/CommitmentsandContingencies">
        <link:definition>9952167 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.muellerindustries.com/role/IncomeTaxes">
        <link:definition>9952168 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLoss" roleURI="http://www.muellerindustries.com/role/AccumulatedOtherComprehensiveIncomeLoss">
        <link:definition>9952169 - Disclosure - Accumulated Other Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InsuranceClaim" roleURI="http://www.muellerindustries.com/role/InsuranceClaim">
        <link:definition>9952170 - Disclosure - Insurance Claim</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RecentAccountingStandardsPolicies" roleURI="http://www.muellerindustries.com/role/RecentAccountingStandardsPolicies">
        <link:definition>9955511 - Disclosure - Recent Accounting Standards (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsTables" roleURI="http://www.muellerindustries.com/role/AcquisitionsTables">
        <link:definition>9955512 - Disclosure - Acquisitions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://www.muellerindustries.com/role/SegmentInformationTables">
        <link:definition>9955513 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashCashEquivalentsandRestrictedCashTables" roleURI="http://www.muellerindustries.com/role/CashCashEquivalentsandRestrictedCashTables">
        <link:definition>9955514 - Disclosure - Cash, Cash Equivalents, and Restricted Cash (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.muellerindustries.com/role/InventoriesTables">
        <link:definition>9955515 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsTables" roleURI="http://www.muellerindustries.com/role/FinancialInstrumentsTables">
        <link:definition>9955516 - Disclosure - Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansTables" roleURI="http://www.muellerindustries.com/role/BenefitPlansTables">
        <link:definition>9955517 - Disclosure - Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossTables" roleURI="http://www.muellerindustries.com/role/AccumulatedOtherComprehensiveIncomeLossTables">
        <link:definition>9955518 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsperCommonShareDetails" roleURI="http://www.muellerindustries.com/role/EarningsperCommonShareDetails">
        <link:definition>9955519 - Disclosure - Earnings per Common Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsNarrativeDetails" roleURI="http://www.muellerindustries.com/role/AcquisitionsNarrativeDetails">
        <link:definition>9955520 - Disclosure - Acquisitions - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsCondensedProFormaConsolidatedResultsofOperationsDetails" roleURI="http://www.muellerindustries.com/role/AcquisitionsCondensedProFormaConsolidatedResultsofOperationsDetails">
        <link:definition>9955521 - Disclosure - Acquisitions - Condensed Pro Forma Consolidated Results of Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationScheduleofDisaggregationofRevenueFromContractswithCustomersDetails" roleURI="http://www.muellerindustries.com/role/SegmentInformationScheduleofDisaggregationofRevenueFromContractswithCustomersDetails">
        <link:definition>9955522 - Disclosure - Segment Information - Schedule of Disaggregation of Revenue From Contracts with Customers (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationScheduleofSegmentInformationDetails" roleURI="http://www.muellerindustries.com/role/SegmentInformationScheduleofSegmentInformationDetails">
        <link:definition>9955523 - Disclosure - Segment Information - Schedule of Segment Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationOthersegmentdisclosuresDetails" roleURI="http://www.muellerindustries.com/role/SegmentInformationOthersegmentdisclosuresDetails">
        <link:definition>9955524 - Disclosure - Segment Information - Other segment disclosures (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashCashEquivalentsandRestrictedCashScheduleofCashandCashEquivalentsandRestrictionsonCashandCashEquivalentsDetails" roleURI="http://www.muellerindustries.com/role/CashCashEquivalentsandRestrictedCashScheduleofCashandCashEquivalentsandRestrictionsonCashandCashEquivalentsDetails">
        <link:definition>9955525 - Disclosure - Cash, Cash Equivalents, and Restricted Cash - Schedule of Cash and Cash Equivalents and Restrictions on Cash and Cash Equivalents (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesScheduleofInventoriesDetails" roleURI="http://www.muellerindustries.com/role/InventoriesScheduleofInventoriesDetails">
        <link:definition>9955526 - Disclosure - Inventories - Schedule of Inventories (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsNarrativeDetails" roleURI="http://www.muellerindustries.com/role/FinancialInstrumentsNarrativeDetails">
        <link:definition>9955527 - Disclosure - Financial Instruments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsScheduleofDerivativeInstrumentsDesignatedasCashFlowHedgesReflectedintheFinancialStatementsDetails" roleURI="http://www.muellerindustries.com/role/FinancialInstrumentsScheduleofDerivativeInstrumentsDesignatedasCashFlowHedgesReflectedintheFinancialStatementsDetails">
        <link:definition>9955528 - Disclosure - Financial Instruments - Schedule of Derivative Instruments Designated as Cash Flow Hedges Reflected in the Financial Statements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsScheduleofFairValueHedgesDetails" roleURI="http://www.muellerindustries.com/role/FinancialInstrumentsScheduleofFairValueHedgesDetails">
        <link:definition>9955529 - Disclosure - Financial Instruments - Schedule of Fair Value Hedges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsScheduleofActivitiesRelatedtoDerivativeInstrumentsClassifiedasCashFlowHedgesDetails" roleURI="http://www.muellerindustries.com/role/FinancialInstrumentsScheduleofActivitiesRelatedtoDerivativeInstrumentsClassifiedasCashFlowHedgesDetails">
        <link:definition>9955530 - Disclosure - Financial Instruments - Schedule of Activities Related to Derivative Instruments Classified as Cash Flow Hedges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedAffiliatesNarrativeDetails" roleURI="http://www.muellerindustries.com/role/InvestmentsinUnconsolidatedAffiliatesNarrativeDetails">
        <link:definition>9955531 - Disclosure - Investments in Unconsolidated Affiliates - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansScheduleofComponentsofNetPeriodicBenefitCostIncomeDetails" roleURI="http://www.muellerindustries.com/role/BenefitPlansScheduleofComponentsofNetPeriodicBenefitCostIncomeDetails">
        <link:definition>9955532 - Disclosure - Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansNarrativeDetails" roleURI="http://www.muellerindustries.com/role/BenefitPlansNarrativeDetails">
        <link:definition>9955533 - Disclosure - Benefit Plans - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails" roleURI="http://www.muellerindustries.com/role/CommitmentsandContingenciesDetails">
        <link:definition>9955534 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesDetails" roleURI="http://www.muellerindustries.com/role/IncomeTaxesDetails">
        <link:definition>9955535 - Disclosure - Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossScheduleofChangesinAOCIbyComponentNetofTaxesandNoncontrollingInterestDetails" roleURI="http://www.muellerindustries.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofChangesinAOCIbyComponentNetofTaxesandNoncontrollingInterestDetails">
        <link:definition>9955536 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in AOCI by Component, Net of Taxes and Noncontrolling Interest (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationAdjustmentsOutofAOCIDetails" roleURI="http://www.muellerindustries.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationAdjustmentsOutofAOCIDetails">
        <link:definition>9955537 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassification Adjustments Out of AOCI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InsuranceClaimDetails" roleURI="http://www.muellerindustries.com/role/InsuranceClaimDetails">
        <link:definition>9955538 - Disclosure - Insurance Claim (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="mli_DefinedBenefitPlansTerminationExpenses" abstract="false" name="DefinedBenefitPlansTerminationExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" abstract="false" name="OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax" abstract="false" name="OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_InvestmentReceivedFromNoncontrollingInterests" abstract="false" name="InvestmentReceivedFromNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures" abstract="false" name="ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_PaymentsForSettlementOfStockBasedAwards" abstract="false" name="PaymentsForSettlementOfStockBasedAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_InvestmentInJointVenture" abstract="false" name="InvestmentInJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_ElkhartProductsCorporationMember" abstract="true" name="ElkhartProductsCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NehringElectricalWorksCompanyMember" abstract="true" name="NehringElectricalWorksCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NumberOfManufacturingLocations" abstract="false" name="NumberOfManufacturingLocations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_TubeAndFittingsMember" abstract="true" name="TubeAndFittingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_BrassRodAndForgingsMember" abstract="true" name="BrassRodAndForgingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OEMComponentsTubeAndAssembliesMember" abstract="true" name="OEMComponentsTubeAndAssembliesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ValvesAndPlumbingSpecialtiesMember" abstract="true" name="ValvesAndPlumbingSpecialtiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_FlexDuctAndOtherHVACComponentsMember" abstract="true" name="FlexDuctAndOtherHVACComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OtherProductsMember" abstract="true" name="OtherProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_PipingSystemsMember" abstract="true" name="PipingSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_IndustrialMetalsMember" abstract="true" name="IndustrialMetalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ClimateMember" abstract="true" name="ClimateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OperatingIncomeLossExcludingCorporate" abstract="false" name="OperatingIncomeLossExcludingCorporate" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_TimePeriodForOpenCopperFutureContract" abstract="false" name="TimePeriodForOpenCopperFutureContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_GainLossOnFairValueOfFutureContracts" abstract="false" name="GainLossOnFairValueOfFutureContracts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromDerivativeInstrumentsEffectNetOfTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromDerivativeInstrumentsEffectNetOfTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_OpenOptionContractsPutAtFairValue" abstract="false" name="OpenOptionContractsPutAtFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_TimePeriodForOpenCopperFutureContractSales" abstract="false" name="TimePeriodForOpenCopperFutureContractSales" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_TecumsehProductsHoldingsLLCMember" abstract="true" name="TecumsehProductsHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_RetailDistributionBusinessMember" abstract="true" name="RetailDistributionBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_CapitalContributionMember" abstract="true" name="CapitalContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_MultiemployerPlansWithdrawalObligationRecognized" abstract="false" name="MultiemployerPlansWithdrawalObligationRecognized" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SoutheastKansasSitesMember" abstract="true" name="SoutheastKansasSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_SoutheastKansasSitesLanyonMember" abstract="true" name="SoutheastKansasSitesLanyonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ShastaAreaMineSitesMember" abstract="true" name="ShastaAreaMineSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_LeadRefinerySiteMember" abstract="true" name="LeadRefinerySiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_LeadRefineryNPLSiteMember" abstract="true" name="LeadRefineryNPLSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_BonitaPeakMiningDistrictMember" abstract="true" name="BonitaPeakMiningDistrictMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_MuellerCopperTubeProductsIncMember" abstract="true" name="MuellerCopperTubeProductsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NonOperatingPropertiesMember" abstract="true" name="NonOperatingPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OperatingPropertiesMember" abstract="true" name="OperatingPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NumberOfFormerSmelterSites" abstract="false" name="NumberOfFormerSmelterSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_GeographicBoundaryOfSites" abstract="false" name="GeographicBoundaryOfSites" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfPartiesInvolvedInSettlementNegotiations" abstract="false" name="NumberOfPartiesInvolvedInSettlementNegotiations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfPropertiesInRemediation" abstract="false" name="NumberOfPropertiesInRemediation" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfSurroundingProperties" abstract="false" name="NumberOfSurroundingProperties" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_PeriodOfPermitImplementationOfBestManagementPractices" abstract="false" name="PeriodOfPermitImplementationOfBestManagementPractices" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_SiteContingencyEstimatedTimeFrameToResolveContingency1" abstract="false" name="SiteContingencyEstimatedTimeFrameToResolveContingency1" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_SiteContingencyPropertiesLossExposureNotAccruedBestEstimate" abstract="false" name="SiteContingencyPropertiesLossExposureNotAccruedBestEstimate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyEnvironmentalRemedialandFeasibilityStudyFinancialGuarantee" abstract="false" name="SiteContingencyEnvironmentalRemedialandFeasibilityStudyFinancialGuarantee" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyNumberOfUnilateralAdministrativeOrders" abstract="false" name="SiteContingencyNumberOfUnilateralAdministrativeOrders" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_SiteContingencyNumberOfPotentiallyResponsibleParties" abstract="false" name="SiteContingencyNumberOfPotentiallyResponsibleParties" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_SiteContingencyTotalCostForAllPartiesBestEstimate" abstract="false" name="SiteContingencyTotalCostForAllPartiesBestEstimate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyReimbursementCostsToThirdPartiesForPastCosts" abstract="false" name="SiteContingencyReimbursementCostsToThirdPartiesForPastCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyAdditionalReimbursementCostsToThirdPartiesForPastCosts" abstract="false" name="SiteContingencyAdditionalReimbursementCostsToThirdPartiesForPastCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_NumberOfMiningSites" abstract="false" name="NumberOfMiningSites" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries" abstract="false" name="AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mli_PaymentForInterestAndDuties" abstract="false" name="PaymentForInterestAndDuties" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_NumberOfImportEntries" abstract="false" name="NumberOfImportEntries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_TermOfGuarantees" abstract="false" name="TermOfGuarantees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_EffectiveIncomeTaxRateReconciliationOtherAdjustmentAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationOtherAdjustmentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_EffectiveIncomeTaxRateReconciliationOtherItemsAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationOtherItemsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_AccumulatedOtherComprehensiveIncomeAttributabletoUnconsolidatedAffiliatesMember" abstract="true" name="AccumulatedOtherComprehensiveIncomeAttributabletoUnconsolidatedAffiliatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_InsuredEventGainLossPretax" abstract="false" name="InsuredEventGainLossPretax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_InsuredEventGainLossAfterTaxImpactPerDilutedShare" abstract="false" name="InsuredEventGainLossAfterTaxImpactPerDilutedShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
</xs:schema>
