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    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_3B6718FCCE7656A60FFCC403867742C4_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_3B6718FCCE7656A60FFCC403867742C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Hierarchy [Axis]</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3ED0E04E59D62D145FEBC40386771684_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3ED0E04E59D62D145FEBC40386771684" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy [Domain]</link:label>
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    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_68B90C4FD78D5F3EA4CEC4038677F9C7_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_68B90C4FD78D5F3EA4CEC4038677F9C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
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    <link:label id="lab_ctas_CanadianTreasurySecuritiesMember_8F4D6987E0348781C7B5C4038678D12D_terseLabel_en-US" xlink:label="lab_ctas_CanadianTreasurySecuritiesMember_8F4D6987E0348781C7B5C4038678D12D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Canadian treasury securities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_37776F4B82EF9EAB17B7C40386789AAB_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_37776F4B82EF9EAB17B7C40386789AAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_AvailableForSaleSecurities_A1FA1CED92CE16AFB982C4038678FB22_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_A1FA1CED92CE16AFB982C4038678FB22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairmentOfInvestments" xlink:label="loc_us-gaap_ImpairmentOfInvestments_FB962D9E733B8C71AA3ABEE1AF87867F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairmentOfInvestments_FB962D9E733B8C71AA3ABEE1AF87867F" xlink:to="lab_us-gaap_ImpairmentOfInvestments_FB962D9E733B8C71AA3ABEE1AF87867F" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">G&amp;K Services, Inc. Transaction and Integration Expenses</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock" xlink:label="loc_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6" xlink:to="lab_us-gaap_BusinessAcquisitionIntegrationRestructuringAndOtherRelatedCostsTextBlock_AA50F629D44732A9CDFCE429C02BFFF6" xlink:type="arc" />
    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360_label_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Service Contracts and Other Assets [Abstract]</link:label>
    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360_documentation_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_GoodwillServiceContractsAndOtherAssetsAbstract" xlink:label="loc_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360" xlink:to="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_7F18377BADFFBAC1D237BEE1B09A8360" xlink:type="arc" />
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50_terseLabel_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50_label_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50_documentation_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_ScheduleOfOtherAssetsTable" xlink:label="loc_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:to="lab_ctas_ScheduleOfOtherAssetsTable_9ABAD5E83527005511EEBEE1B09ABC50" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4639C215D714DDD3D661BEE1B09AA317" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1C88B2F4E26D780539B0BEE1B09A22F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service Contracts</link:label>
    <link:label id="lab_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6_label_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServiceAgreementsMember" xlink:label="loc_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6" xlink:to="lab_us-gaap_ServiceAgreementsMember_6A4E704F5D4456AC75B1BEE1B0A07CC6" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61_label_en-US" xlink:label="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61_documentation_en-US" xlink:label="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_OtherAssetsAxis" xlink:label="loc_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:to="lab_ctas_OtherAssetsAxis_F8BB0FB677D997DCD30CBEE1B0A0BD61" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A_label_en-US" xlink:label="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A_documentation_en-US" xlink:label="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_OtherAssetsDomain" xlink:label="loc_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:to="lab_ctas_OtherAssetsDomain_053A6D73C7F7D903DB40BEE1B0A02F4A" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739_terseLabel_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncompete and consulting agreements</link:label>
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739_label_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncompete Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739" xlink:to="lab_us-gaap_NoncompeteAgreementsMember_4401ECDC684F304F018FBEE1B0A07739" xlink:type="arc" />
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612_terseLabel_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612_label_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Assets [Member]</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612_documentation_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of assets, which have not been itemized or categorized in footnotes to financial statements and are a component of other assets.</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_OtherMiscellaneousAssetsMember" xlink:label="loc_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:to="lab_ctas_OtherMiscellaneousAssetsMember_0606325B3D1CB23AE2EBBEE1B0A05612" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Information regarding service contracts and other assets</link:label>
    <link:label id="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647_label_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Line Items]</link:label>
    <link:label id="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647_documentation_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ctas-20170831.xsd#ctas_OtherAssetsLineItems" xlink:label="loc_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:to="lab_ctas_OtherAssetsLineItems_F0CBCAC38A0D62F58D70BEE1B0A02647" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, carrying amount</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsGross_40108C455D497859F377BEE1B0A0A9F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A8A2AB1AE8EE540F784EBEE1B0A18B67_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A8A2AB1AE8EE540F784EBEE1B0A18B67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, accumulated amortization</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A8A2AB1AE8EE540F784EBEE1B0A18B67_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A8A2AB1AE8EE540F784EBEE1B0A18B67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A8A2AB1AE8EE540F784EBEE1B0A18B67" xlink:type="locator" />
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    <link:label id="lab_ctas_ScheduleOfServiceContractsFiniteLivedIntangibleAssetsByOperatingSegmentTableTextBlock_75C8F01A8828B1AC1D3EBEE1AD5177FC_terseLabel_en-US" xlink:label="lab_ctas_ScheduleOfServiceContractsFiniteLivedIntangibleAssetsByOperatingSegmentTableTextBlock_75C8F01A8828B1AC1D3EBEE1AD5177FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in the Carrying Amount of Service Contracts by Operating Segment</link:label>
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    <link:loc xlink:href="ctas-20170831.xsd#ctas_ScheduleOfFiniteLivedIntangibleAssetsAndOtherAssetsByMajorClassTableTextBlock" xlink:label="loc_ctas_ScheduleOfFiniteLivedIntangibleAssetsAndOtherAssetsByMajorClassTableTextBlock_6DA17291AC57C040816CBEE1AD51BA21" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtDisclosureAbstract_ED84E3D6B1CF71439095BF2E74A43C49_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_ED84E3D6B1CF71439095BF2E74A43C49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_ED84E3D6B1CF71439095BF2E74A43C49" xlink:type="locator" />
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    <link:label id="lab_ctas_DebtDerivativesInstrumentsAndHedgingActivitiesDisclosureTextBlock_7C1A6AA849DFD3714FCCBF1C27BEA72D_documentation_en-US" xlink:label="lab_ctas_DebtDerivativesInstrumentsAndHedgingActivitiesDisclosureTextBlock_7C1A6AA849DFD3714FCCBF1C27BEA72D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information about whether or not the entity is in compliance with debt covenants and the effects of noncompliance with debt covenants; and the entity's entire derivative instruments and hedging activities disclosure as a single block of text which describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising there from, and the amounts of and methodologies and assumptions used in determining the amounts of such items.</link:label>
    <link:loc xlink:href="ctas-20170831.xsd#ctas_DebtDerivativesInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:label="loc_ctas_DebtDerivativesInstrumentsAndHedgingActivitiesDisclosureTextBlock_7C1A6AA849DFD3714FCCBF1C27BEA72D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ServicingContractsMember_D6E6CB96AD1A187D6366BEE1AD244E91_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingContractsMember_D6E6CB96AD1A187D6366BEE1AD244E91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts</link:label>
    <link:label id="lab_us-gaap_ServicingContractsMember_D6E6CB96AD1A187D6366BEE1AD244E91_label_en-US" xlink:label="lab_us-gaap_ServicingContractsMember_D6E6CB96AD1A187D6366BEE1AD244E91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Contracts [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingContractsMember" xlink:label="loc_us-gaap_ServicingContractsMember_D6E6CB96AD1A187D6366BEE1AD244E91" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TradeNamesMember_DDCD4B95232FD7FF505ABEE1AD2432BC_terseLabel_en-US" xlink:label="lab_us-gaap_TradeNamesMember_DDCD4B95232FD7FF505ABEE1AD2432BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade names</link:label>
    <link:label id="lab_us-gaap_TradeNamesMember_DDCD4B95232FD7FF505ABEE1AD2432BC_label_en-US" xlink:label="lab_us-gaap_TradeNamesMember_DDCD4B95232FD7FF505ABEE1AD2432BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade Names [Member]</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_280D641E6BB264A1FE86E2E2E4C82562_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_280D641E6BB264A1FE86E2E2E4C82562" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_280D641E6BB264A1FE86E2E2E4C82562_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_280D641E6BB264A1FE86E2E2E4C82562" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesCurrent_D7A031D45A4B7BDCCB33E2F7D34FEDB3" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_2C816A5E5461F290F9B1E2E2E4C8D855_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_2C816A5E5461F290F9B1E2E2E4C8D855" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_2C816A5E5461F290F9B1E2E2E4C8D855_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_2C816A5E5461F290F9B1E2E2E4C8D855" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Net, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_2C816A5E5461F290F9B1E2E2E4C8D855" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryNet_67A1DE3A05BEDF7BEBD3E2E2E4C898E7_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_67A1DE3A05BEDF7BEBD3E2E2E4C898E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
    <link:label id="lab_us-gaap_InventoryNet_67A1DE3A05BEDF7BEBD3E2E2E4C898E7_label_en-US" xlink:label="lab_us-gaap_InventoryNet_67A1DE3A05BEDF7BEBD3E2E2E4C898E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
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    <link:label id="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF_terseLabel_en-US" xlink:label="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Uniforms and other rental items in service</link:label>
    <link:label id="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF_label_en-US" xlink:label="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Uniforms and Other Rental Items in Service</link:label>
    <link:label id="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF_documentation_en-US" xlink:label="lab_ctas_UniformsAndOtherRentalItemsInService_753BA7B853532F41A981E2E2E4C860BF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Aggregate carrying value as of the balance sheet date of the Rental Uniforms and Ancillary Products operating segment inventory, valued at cost less amortization, calculated using the straight-line method.</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesReceivable_3165C86FFC0F5F8402A4E2E2E4C8DB37_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_3165C86FFC0F5F8402A4E2E2E4C8DB37" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes, current</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesReceivable_3165C86FFC0F5F8402A4E2E2E4C8DB37_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_3165C86FFC0F5F8402A4E2E2E4C8DB37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Receivable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_3165C86FFC0F5F8402A4E2E2E4C8DB37" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1AC5190326558463D291E2E2E4C8455C_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1AC5190326558463D291E2E2E4C8455C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1AC5190326558463D291E2E2E4C8455C_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1AC5190326558463D291E2E2E4C8455C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense and Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1AC5190326558463D291E2E2E4C8455C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_EDCD551C7065E7DE900DE2E2E4C8C2D7_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_EDCD551C7065E7DE900DE2E2E4C8C2D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets held for sale</link:label>
    <link:label id="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_EDCD551C7065E7DE900DE2E2E4C8C2D7_label_en-US" xlink:label="lab_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_EDCD551C7065E7DE900DE2E2E4C8C2D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Including Discontinued Operation, Assets, Current</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_C9FA3605B3974B5B0C69E2E2E4C8D95F_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_C9FA3605B3974B5B0C69E2E2E4C8D95F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_C9FA3605B3974B5B0C69E2E2E4C8D95F_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_C9FA3605B3974B5B0C69E2E2E4C8D95F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_951E8C08CF53E54750B2E2E2E4C8F2B6_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_951E8C08CF53E54750B2E2E2E4C8F2B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and equipment, net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_951E8C08CF53E54750B2E2E2E4C8F2B6_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_951E8C08CF53E54750B2E2E2E4C8F2B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
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    <link:label id="lab_us-gaap_Investments_9EEB631707160A7400D5E2E2E4C84B22_terseLabel_en-US" xlink:label="lab_us-gaap_Investments_9EEB631707160A7400D5E2E2E4C84B22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments</link:label>
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    <link:label id="lab_us-gaap_Goodwill_E829548C94DBCDB186E0E2E2E4C8EB96_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_E829548C94DBCDB186E0E2E2E4C8EB96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_Goodwill_E829548C94DBCDB186E0E2E2E4C8EB96_label_en-US" xlink:label="lab_us-gaap_Goodwill_E829548C94DBCDB186E0E2E2E4C8EB96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:label id="lab_ctas_ServiceContractsFiniteLivedIntangibleAssetsNet_419855564BAD7E29FF62E2E2E4C81128_terseLabel_en-US" xlink:label="lab_ctas_ServiceContractsFiniteLivedIntangibleAssetsNet_419855564BAD7E29FF62E2E2E4C81128" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, net</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_747E05D8EB302037C8A7E2E2E4C94655_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_747E05D8EB302037C8A7E2E2E4C94655" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets, net</link:label>
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    <link:label id="lab_us-gaap_FairValueInputsDiscountRate_1F2CE46E7C1A06E35E35ECA2A6B5D073_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsDiscountRate_1F2CE46E7C1A06E35E35ECA2A6B5D073" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount rate (as a percent)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsDiscountRate_1F2CE46E7C1A06E35E35ECA2A6B5D073_label_en-US" xlink:label="lab_us-gaap_FairValueInputsDiscountRate_1F2CE46E7C1A06E35E35ECA2A6B5D073" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Discount Rate</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentFairValueDisclosure_EB70776405869808F1E3ECA2A6B61F3B_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentFairValueDisclosure_EB70776405869808F1E3ECA2A6B61F3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Preliminary fair value property, plant and equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentFairValueDisclosure_EB70776405869808F1E3ECA2A6B61F3B_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentFairValueDisclosure_EB70776405869808F1E3ECA2A6B61F3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant, and Equipment, Fair Value Disclosure</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_56FF8D7682B5366E8662ECA2A6B65075_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_56FF8D7682B5366E8662ECA2A6B65075" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Goodwill, Expected Tax Deductible Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_56FF8D7682B5366E8662ECA2A6B65075" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_ADE3C305FA58421BFB89BEE1AF47B5A7_label_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_ADE3C305FA58421BFB89BEE1AF47B5A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Intangible Assets</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets_ADE3C305FA58421BFB89BEE1AF47B5A7" xlink:to="lab_us-gaap_AmortizationOfIntangibleAssets_ADE3C305FA58421BFB89BEE1AF47B5A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated amortization expense, year one</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_B7F82683678F260C21E8BEE1AF477259" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_117F809BC302F76BF780BEE1AF47A5F1_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_117F809BC302F76BF780BEE1AF47A5F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated amortization expense, year two</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_117F809BC302F76BF780BEE1AF47A5F1_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_117F809BC302F76BF780BEE1AF47A5F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_117F809BC302F76BF780BEE1AF47A5F1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BA65C2703FD4F15732A9BEE1AF4752AB_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BA65C2703FD4F15732A9BEE1AF4752AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BA65C2703FD4F15732A9BEE1AF4752AB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BAB127D93B90EC49475BEE1AF47AE46_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BAB127D93B90EC49475BEE1AF47AE46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated amortization expense, year four</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BAB127D93B90EC49475BEE1AF47AE46_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BAB127D93B90EC49475BEE1AF47AE46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2BAB127D93B90EC49475BEE1AF47AE46" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_513339AF253FDF43BF68BEE1AF47F3AA_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_513339AF253FDF43BF68BEE1AF47F3AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated amortization expense, year five</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_513339AF253FDF43BF68BEE1AF47F3AA_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_513339AF253FDF43BF68BEE1AF47F3AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_513339AF253FDF43BF68BEE1AF47F3AA" xlink:type="locator" />
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    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsDisclosureTextBlock_9ADD9697200EA5D970E0BEE1AF9562DF_terseLabel_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsDisclosureTextBlock_9ADD9697200EA5D970E0BEE1AF9562DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill, Service Contracts and Other Assets</link:label>
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    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsDisclosureTextBlock_9ADD9697200EA5D970E0BEE1AF9562DF_documentation_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsDisclosureTextBlock_9ADD9697200EA5D970E0BEE1AF9562DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element encapsulates entire disclosures pertaining to goodwill, service contracts and other assets.</link:label>
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    <link:label id="lab_us-gaap_SegmentReportingAbstract_B348420D375C1060B214BEE1B08B13E6_label_en-US" xlink:label="lab_us-gaap_SegmentReportingAbstract_B348420D375C1060B214BEE1B08B13E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_8ABACD1724C7C76F5F3FE35A0B6E21EE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_8ABACD1724C7C76F5F3FE35A0B6E21EE" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_8ABACD1724C7C76F5F3FE35A0B6E21EE" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash provided by operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_BA0CC201674089925E38E35A0B6FCFB9" xlink:type="arc" />
    <link:label id="lab_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9_terseLabel_en-US" xlink:label="lab_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9_label_en-US" xlink:label="lab_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9" xlink:to="lab_us-gaap_Depreciation_DFA00B4B6525B85D4567E35A0B6FD7D9" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of intangible assets</link:label>
    <link:label id="lab_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3_label_en-US" xlink:label="lab_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3" xlink:to="lab_us-gaap_AdjustmentForAmortization_99416B756ABC362626ACE35A0B6F04D3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF" xlink:to="lab_us-gaap_ShareBasedCompensation_EB5340CB082FC9B9D7A6E35A0B6F81AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Gain on sale of business</link:label>
    <link:label id="lab_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4_label_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4" xlink:to="lab_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_24D670CC0A9C04BEFED5E35A0B6F02E4" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Deferred Income Taxes</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E" xlink:to="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_99C8A886D94DD4BE0D30E35A0B6F5C1E" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in current assets and liabilities, net of acquisitions of businesses:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_D97027BF0914DD6D1301E35A0B6FED83" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_03B158CED91A63A7271CE35A0B6F6F49" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Inventories</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_9F72161D5FA23D056ADEE35A0B6F6A02" xlink:type="arc" />
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B_negatedLabel_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Uniforms and other rental items in service</link:label>
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B_label_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Uniforms and Other Rental Items in Service</link:label>
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B_documentation_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_E18F36A059ACFB72533DE35A0B6F789B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the increase (decrease) in cash flows related to uniforms and other rental items in service for the current reporting year.</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_FF2F97681B9F4F1282DFE35A0B6F6FAF" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_2DD081331ED77ADE0666E35A0B6FCC29_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_2DD081331ED77ADE0666E35A0B6FCC29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_2DD081331ED77ADE0666E35A0B6FCC29_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_2DD081331ED77ADE0666E35A0B6FCC29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_2DD081331ED77ADE0666E35A0B6FCC29" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued compensation and related liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Employee Related Liabilities</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5" xlink:to="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_4E8F8078A25CDC70B931E35A0B6FF5B5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_A34BAC0844F76CDB4FB7E35A0B6F4EC3_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_A34BAC0844F76CDB4FB7E35A0B6F4EC3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities and other</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_A34BAC0844F76CDB4FB7E35A0B6F4EC3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_A34BAC0844F76CDB4FB7E35A0B6F4EC3" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_A34BAC0844F76CDB4FB7E35A0B6F4EC3" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2546283CEE1392FDB66CE35A0B7054B5_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2546283CEE1392FDB66CE35A0B7054B5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes, current</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2546283CEE1392FDB66CE35A0B7054B5_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2546283CEE1392FDB66CE35A0B7054B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_46DCA4CBB741D8E117E2E35A0B7081E5" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_33557E3FCC8DCEA1602EE35A0B70F6EA" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_33557E3FCC8DCEA1602EE35A0B70F6EA" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_C8DC4BDE651AC7E9CB0AE35A0B70205B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_C8DC4BDE651AC7E9CB0AE35A0B70205B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_C8DC4BDE651AC7E9CB0AE35A0B70205B" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_9072CD8965BE694FAB8AE35A0B709497" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireInvestments_6C48C7C92CBA4A2500A5E35A0B703365_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInvestments_6C48C7C92CBA4A2500A5E35A0B703365" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of marketable securities and investments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_6C48C7C92CBA4A2500A5E35A0B703365" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_EC7E7BCF564DAE13572CE35A0B704C4E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_EC7E7BCF564DAE13572CE35A0B704C4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of business</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_EC7E7BCF564DAE13572CE35A0B704C4E_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_EC7E7BCF564DAE13572CE35A0B704C4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Divestiture of Businesses, Net of Cash Divested</link:label>
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