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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_BFC4102325A1B947F566798E2FE28F2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_BFC4102325A1B947F566798E2FE28F2F" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_BFC4102325A1B947F566798E2FE28F2F" xlink:type="arc" />
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    <link:label id="lab_mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_E4D14E0F3829F9DD9335798E2FE37390_terseLabel_en-US" xlink:label="lab_mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_E4D14E0F3829F9DD9335798E2FE37390" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Attributable to unconsolidated affiliates, net of tax of $2,005, $415, $2,086, and $614</link:label>
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    <link:loc xlink:href="mli-20180929.xsd#mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_E4D14E0F3829F9DD9335798E2FE37390" xlink:type="locator" />
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    <link:label id="lab_mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C68F3B42B1010C89FDF0798E2FE3D048_label_en-US" xlink:label="lab_mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C68F3B42B1010C89FDF0798E2FE3D048" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income, Other, Net of Tax, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:label id="lab_mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C68F3B42B1010C89FDF0798E2FE3D048_documentation_en-US" xlink:label="lab_mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C68F3B42B1010C89FDF0798E2FE3D048" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other Including Portion Attributable to Noncontrolling Interest.</link:label>
    <link:loc xlink:href="mli-20180929.xsd#mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_mli_OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C68F3B42B1010C89FDF0798E2FE3D048" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Consolidated comprehensive income</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_AF0F4F6FD38F693069DA798E2FE3ABAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income attributable to noncontrolling interests</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_9CFAD3305F45747B7E30798E2FE35318" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income attributable to Mueller Industries, Inc.</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTax_5AD4562289D802A1B5A6798E2FE3F0C8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_EDDA90B6176DA2AD0103A10784037C0F_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_EDDA90B6176DA2AD0103A10784037C0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Table]</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_EDDA90B6176DA2AD0103A10784037C0F_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_EDDA90B6176DA2AD0103A10784037C0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_EDDA90B6176DA2AD0103A10784037C0F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_932B5515E26EFA8173D9A1078404D6C0_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_932B5515E26EFA8173D9A1078404D6C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized losses (gains) on derivatives [Member]</link:label>
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    <link:label id="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_6FDECA77F1CD844FDB18A107840522AF_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_6FDECA77F1CD844FDB18A107840522AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of available-for-sale securities [Member]</link:label>
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    <link:loc xlink:href="mli-20180929.xsd#mli_PipingSystemsMember" xlink:label="loc_mli_PipingSystemsMember_1B88AC46EB3D53FBAF85EA6CEB161F0E" xlink:type="locator" />
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    <link:label id="lab_mli_IndustrialMetalsMember_6B47BA37E9EFA3801C2913371063F4F5_documentation_en-US" xlink:label="lab_mli_IndustrialMetalsMember_F28DCF97A5695CDF9A38D5960FB6C40E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.</link:label>
    <link:loc xlink:href="mli-20180929.xsd#mli_IndustrialMetalsMember" xlink:label="loc_mli_IndustrialMetalsMember_F28DCF97A5695CDF9A38D5960FB6C40E" xlink:type="locator" />
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    <link:loc xlink:href="mli-20180929.xsd#mli_ClimateMember" xlink:label="loc_mli_ClimateMember_2D3E69BE09EE5ECD87349C51DF666E32" xlink:type="locator" />
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    <link:label id="lab_mli_UnlawfulEmploymentPracticesMember_67301C9F55D3AB34C70ECF3E386CB000_terseLabel_en-US" xlink:label="lab_mli_UnlawfulEmploymentPracticesMember_67301C9F55D3AB34C70ECF3E386CB000" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unlawful Employment Practices [Member]</link:label>
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    <link:label id="lab_mli_NumberOfPartiesInvolvedInSettlementNegotiations_887988FC77C0B18A511DCF3E386E8501_terseLabel_en-US" xlink:label="lab_mli_NumberOfPartiesInvolvedInSettlementNegotiations_887988FC77C0B18A511DCF3E386E8501" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of parties involved in settlement negotiations</link:label>
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    <link:loc xlink:href="mli-20180929.xsd#mli_NumberOfPartiesInvolvedInSettlementNegotiations" xlink:label="loc_mli_NumberOfPartiesInvolvedInSettlementNegotiations_887988FC77C0B18A511DCF3E386E8501" xlink:type="locator" />
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    <link:label id="lab_mli_PeriodOfPermitImplementationOfBestManagementPractices_8B5785ACFD2FBFDD4B53CF3E386F00D2_terseLabel_en-US" xlink:label="lab_mli_PeriodOfPermitImplementationOfBestManagementPractices_8B5785ACFD2FBFDD4B53CF3E386F00D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period of permit, implementation of Best Management Practices</link:label>
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    <link:label id="lab_mli_PeriodOfPermitImplementationOfBestManagementPractices_8B5785ACFD2FBFDD4B53CF3E386F00D2_documentation_en-US" xlink:label="lab_mli_PeriodOfPermitImplementationOfBestManagementPractices_8B5785ACFD2FBFDD4B53CF3E386F00D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The period of permit for the continued implementation of Best Management Practices.</link:label>
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    <link:label id="lab_us-gaap_EnvironmentalExitCostsReasonablyPossibleAdditionalLoss_8F978AB6C3EB65A7F26BCF3E3870739D_terseLabel_en-US" xlink:label="lab_us-gaap_EnvironmentalExitCostsReasonablyPossibleAdditionalLoss_8F978AB6C3EB65A7F26BCF3E3870739D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated remediation costs</link:label>
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    <link:label id="lab_mli_SiteContingencyEstimatedTimeFrameToResolveContingency1_3BEB6987F832B70807ABCF3E38709369_terseLabel_en-US" xlink:label="lab_mli_SiteContingencyEstimatedTimeFrameToResolveContingency1_3BEB6987F832B70807ABCF3E38709369" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated remediation costs, term</link:label>
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    <link:label id="lab_mli_SiteContingencyPropertiesLossExposureNotAccruedBestEstimate_CF7EAA9758DFD173EB9DCF3E38706C18_terseLabel_en-US" xlink:label="lab_mli_SiteContingencyPropertiesLossExposureNotAccruedBestEstimate_CF7EAA9758DFD173EB9DCF3E38706C18" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount 2 other PRPs will pay to fund cleanup</link:label>
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    <link:label id="lab_mli_NumberOfSurroundingProperties_AA6D8F8AADDDF312150ECF3E38706FCE_terseLabel_en-US" xlink:label="lab_mli_NumberOfSurroundingProperties_AA6D8F8AADDDF312150ECF3E38706FCE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of surrounding properties</link:label>
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    <link:label id="lab_mli_PaymentForInterestAndDuties_99F93333689F85613084CF3E38728409_terseLabel_en-US" xlink:label="lab_mli_PaymentForInterestAndDuties_99F93333689F85613084CF3E38728409" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment for interest and duties</link:label>
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    <link:label id="lab_mli_PaymentForInterestAndDuties_99F93333689F85613084CF3E38728409_documentation_en-US" xlink:label="lab_mli_PaymentForInterestAndDuties_99F93333689F85613084CF3E38728409" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Refers to requesting payment for interest and duties related to import entries.</link:label>
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    <link:label id="lab_mli_TermOfGuarantees_1DA7ACAEE3AB5C621758CF3E38777FE4_terseLabel_en-US" xlink:label="lab_mli_TermOfGuarantees_1DA7ACAEE3AB5C621758CF3E38777FE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term of guarantees</link:label>
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    <link:label id="lab_mli_TermOfGuarantees_1DA7ACAEE3AB5C621758CF3E38777FE4_documentation_en-US" xlink:label="lab_mli_TermOfGuarantees_1DA7ACAEE3AB5C621758CF3E38777FE4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the term of guarantees.</link:label>
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