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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1C67824C0E08219432619F531A98CC43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1C67824C0E08219432619F531A98CC43" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_1C67824C0E08219432619F531A98CC43" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_9B22BB1DF9146074BF019F531A993214_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_9B22BB1DF9146074BF019F531A993214" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade accounts receivable, net of allowances of $14.1 and $25.5 at July 31, 2018 and October 31, 2017, respectively</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_9B22BB1DF9146074BF019F531A993214_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_9B22BB1DF9146074BF019F531A993214" 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_9B22BB1DF9146074BF019F531A993214" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_7A883F5377E64BE81DA79F531A99EF47_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_7A883F5377E64BE81DA79F531A99EF47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_7A883F5377E64BE81DA79F531A99EF47_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_7A883F5377E64BE81DA79F531A99EF47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense, Current</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsCurrent_D83B5F2619867A8C33819F531A992172_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_D83B5F2619867A8C33819F531A992172" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_D83B5F2619867A8C33819F531A992172_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_D83B5F2619867A8C33819F531A992172" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C" 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_11C18EA40E7F9D504CC79F531A99CF8C_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C" xlink:to="lab_us-gaap_AssetsCurrent_11C18EA40E7F9D504CC79F531A99CF8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other investments</link:label>
    <link:label id="lab_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865_label_en-US" xlink:label="lab_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long-term Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLongTermInvestments" xlink:label="loc_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865" xlink:to="lab_us-gaap_OtherLongTermInvestments_E3267448784ACFDEF1C19F531A99E865" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment, net of accumulated depreciation of $163.8 and $136.4 at July 31, 2018 and October 31, 2017, respectively</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_17E0EB37E5C5473577D39F531A9AB50A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_FB9BC341DECCC893CD209F531A9A599A_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_FB9BC341DECCC893CD209F531A9A599A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other intangible assets, net of accumulated amortization of $238.4 and $189.1 at July 31, 2018 and October 31, 2017, respectively</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_FB9BC341DECCC893CD209F531A9A599A_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_FB9BC341DECCC893CD209F531A9A599A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_FB9BC341DECCC893CD209F531A9A599A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C" 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_467F0321894C5713E1E19F531A9AC54C_label_en-US" xlink:label="lab_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C" xlink:to="lab_us-gaap_Goodwill_467F0321894C5713E1E19F531A9AC54C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_A2545C76F4A41BABA6499F531A9A07D4_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_A2545C76F4A41BABA6499F531A9A07D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other noncurrent assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_A2545C76F4A41BABA6499F531A9A07D4_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_A2545C76F4A41BABA6499F531A9A07D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_A2545C76F4A41BABA6499F531A9A07D4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Assets_2A9254222937A9AFC8349F531A9A544E_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_2A9254222937A9AFC8349F531A9A544E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_Assets_2A9254222937A9AFC8349F531A9A544E_label_en-US" xlink:label="lab_us-gaap_Assets_2A9254222937A9AFC8349F531A9A544E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_BCD0ECD524A6CF7880949F531A9A09E6_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_BCD0ECD524A6CF7880949F531A9A09E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS&#8217; EQUITY</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_BCD0ECD524A6CF7880949F531A9A09E6_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_BCD0ECD524A6CF7880949F531A9A09E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_C52B8EE1A0EE439919529F531A9B2CBA_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_C52B8EE1A0EE439919529F531A9B2CBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [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_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_837A75566D6D586ABD14FDE966C395C2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonStockSharesIssued_1BA4E266777FC8A2A385B0D4E2BF0597_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_9E62D7D0643F5AD08D74E08F85782E58" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
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    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_703639F0F408F22408E0B0D4E2BF0DB7_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_4AD2B6CA3A415518A7ECD6112F2B8B14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Outstanding</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_9CCF75E3A9989D2DE1F7F3F2A7ACED12_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_10839628F6435B048DB652CC6F1FFF6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income Per Common Share</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_9CCF75E3A9989D2DE1F7F3F2A7ACED12_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_10839628F6435B048DB652CC6F1FFF6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
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    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425_terseLabel_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Other Liabilities [Table]</link:label>
    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425_label_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Other Liabilities [Table]</link:label>
    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425_documentation_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of Other Liabilities [Table]</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_ScheduleOfOtherLiabilitiesTable" xlink:label="loc_abm_ScheduleOfOtherLiabilitiesTable_EB00249E7FAB802883E7904ABBDD4425" xlink:type="locator" />
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    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB_terseLabel_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Other Liabilities [Line Items]</link:label>
    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB_label_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Other Liabilities [Line Items]</link:label>
    <link:label id="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB_documentation_en-US" xlink:label="lab_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of Other Liabilities [Line Items]</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_ScheduleOfOtherLiabilitiesLineItems" xlink:label="loc_abm_ScheduleOfOtherLiabilitiesLineItems_A7DA5BEC856DB250C794904ABBDFC7DB" xlink:type="locator" />
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    <link:label id="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019_terseLabel_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Self insurance retention amount per-claim</link:label>
    <link:label id="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019_label_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Self Insured Retention Amount Per Occurrence</link:label>
    <link:label id="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019_documentation_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Self Insured Retention Amount Per Occurrence</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_SelfInsuredRetentionAmountPerOccurrence" xlink:label="loc_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:to="lab_abm_SelfInsuredRetentionAmountPerOccurrence_0C4135EF000CD1F196CB904ABBE0F019" xlink:type="arc" />
    <link:label id="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211_terseLabel_en-US" xlink:label="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Primary policy limit</link:label>
    <link:label id="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211_label_en-US" xlink:label="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Workers Compensation General Liability and Other Insurable Risks Insurance Policy Limit</link:label>
    <link:label id="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211_documentation_en-US" xlink:label="lab_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the policy limit provided by the insurance program for workers' compensation, general liability, and other insurable risks.</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit" xlink:label="loc_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_D16BBDBC90BBE237CC41904ABBE0F211" xlink:type="locator" />
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    <link:label id="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901_terseLabel_en-US" xlink:label="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance policy coverage, general and automobile liability losses</link:label>
    <link:label id="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901_label_en-US" xlink:label="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insurance Policy Coverage, General Liability And Automobile Liability Losses</link:label>
    <link:label id="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901_documentation_en-US" xlink:label="lab_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_8359E9AA20E77D1F4C08904ABBE08901" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents commercial insurance umbrella policies that cover general liability and automobile liability losses above primary limits.</link:label>
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    <link:label id="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171_terseLabel_en-US" xlink:label="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance policy coverage, property damage</link:label>
    <link:label id="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171_label_en-US" xlink:label="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Damage Policy Limit</link:label>
    <link:label id="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171_documentation_en-US" xlink:label="lab_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the policy limit provided by the insurance program for property damage risks.</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_PropertyDamagePolicyLimit" xlink:label="loc_abm_PropertyDamagePolicyLimit_D68192696F2339E367FB904ABBE0D171" xlink:type="locator" />
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    <link:label id="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1_terseLabel_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Self insurance retention amount per-claim, medical plan</link:label>
    <link:label id="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1_label_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Self Insured Retention Amount Per Participant Per Year For Certain Employee Medical And Dental Programs</link:label>
    <link:label id="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1_documentation_en-US" xlink:label="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Self Insured Retention Amount Per Participant Per Year For Certain Employee Medical And Dental Programs</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms" xlink:label="loc_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:to="lab_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_A8285F3B84A15734E1E6904ABBE04BC1" xlink:type="arc" />
    <link:label id="lab_abm_IncreaseinTotalReserveClaims_A0D950236D685D95E84E904ABBE14922_verboseLabel_en-US" xlink:label="lab_abm_IncreaseinTotalReserveClaims_A0D950236D685D95E84E904ABBE14922" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Change in reserves for insurance claims</link:label>
    <link:label id="lab_abm_IncreaseinTotalReserveClaims_A0D950236D685D95E84E904ABBE14922_label_en-US" xlink:label="lab_abm_IncreaseinTotalReserveClaims_A0D950236D685D95E84E904ABBE14922" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase in Total Reserve Claims</link:label>
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    <link:loc xlink:href="abm-20180731.xsd#abm_IncreaseinTotalReserveClaims" xlink:label="loc_abm_IncreaseinTotalReserveClaims_A0D950236D685D95E84E904ABBE14922" xlink:type="locator" />
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    <link:label id="lab_abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount_93174D5C99894BCAB89E904ABBE1B431_terseLabel_en-US" xlink:label="lab_abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount_93174D5C99894BCAB89E904ABBE1B431" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance reserve adjustment, amount less than prior year adjustment</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_38F9DAC757A60ECF2D70A8D69787AC7C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_38F9DAC757A60ECF2D70A8D69787AC7C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities of continuing operations</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_38F9DAC757A60ECF2D70A8D69787AC7C_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_38F9DAC757A60ECF2D70A8D69787AC7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</link:label>
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    <link:label id="lab_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_F757180F705C6D8713FBA8D69787BAD9_label_en-US" xlink:label="lab_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_F757180F705C6D8713FBA8D69787BAD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Operating Activities, Discontinued Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_F757180F705C6D8713FBA8D69787BAD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_F757180F705C6D8713FBA8D69787BAD9" xlink:to="lab_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_F757180F705C6D8713FBA8D69787BAD9" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA" 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_DC3D190973A01851C28AA8D69787BCFA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC3D190973A01851C28AA8D69787BCFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7ECC7897DF6878B90907A8D697889E48_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7ECC7897DF6878B90907A8D697889E48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities</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_39406A7AB3D2CDE03CD6A8D697884261" xlink:type="locator" />
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    <link:label id="lab_abm_DivestitureOfBusinessesAdjustments_AD7AC99D5205545784FBA8D6978891ED_negatedTerseLabel_en-US" xlink:label="lab_abm_DivestitureOfBusinessesAdjustments_AD7AC99D5205545784FBA8D6978891ED" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">(Adjustments to) and proceeds from sale of business</link:label>
    <link:label id="lab_abm_DivestitureOfBusinessesAdjustments_AD7AC99D5205545784FBA8D6978891ED_label_en-US" xlink:label="lab_abm_DivestitureOfBusinessesAdjustments_AD7AC99D5205545784FBA8D6978891ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Divestiture Of Businesses, Adjustments</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_40D8359CE34428D86CC8A8D697888758_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_40D8359CE34428D86CC8A8D697888758" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchase of businesses, net of cash acquired</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_40D8359CE34428D86CC8A8D697888758_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_40D8359CE34428D86CC8A8D697888758" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Businesses, Net of Cash Acquired</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_FE82C8AF6C3B14B17A64A8D697891490_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_FE82C8AF6C3B14B17A64A8D697891490" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Investments in unconsolidated affiliates</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_431A181FA41AA62D78F3A8D69789BCE1_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_431A181FA41AA62D78F3A8D69789BCE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_431A181FA41AA62D78F3A8D69789BCE1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_55714B8976FF7143CE7FF3F2A7CB1DC8_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4B49472C58B15C598E2620163725D38F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtCurrentAbstract_2B5669577746E4AD2178F790B9F493E0_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrentAbstract_6339483B689E59A8A762CE6B66CC13BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current portion of long-term debt</link:label>
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    <link:label id="lab_abm_LoansPayableCurrentGross_A53B50166445F2B1A559F78CC83E501C_terseLabel_en-US" xlink:label="lab_abm_LoansPayableCurrentGross_B768AE35D3CC5EC2BC8CC5E8E0703FC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross term loan</link:label>
    <link:label id="lab_abm_LoansPayableCurrentGross_A53B50166445F2B1A559F78CC83E501C_label_en-US" xlink:label="lab_abm_LoansPayableCurrentGross_B768AE35D3CC5EC2BC8CC5E8E0703FC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable, Current, Gross</link:label>
    <link:label id="lab_abm_LoansPayableCurrentGross_A53B50166445F2B1A559F78CC83E501C_documentation_en-US" xlink:label="lab_abm_LoansPayableCurrentGross_B768AE35D3CC5EC2BC8CC5E8E0703FC4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loans Payable, Current, Gross</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtNoncurrentAbstract_5D9F8F99F3E9D2FD2DD8F7917F8246B5_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrentAbstract_71CBA4EECD5D57C6B48361AB350A546B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Excluding Current Maturities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtNoncurrentAbstract" xlink:label="loc_us-gaap_LongTermDebtNoncurrentAbstract_71CBA4EECD5D57C6B48361AB350A546B" xlink:type="locator" />
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    <link:label id="lab_abm_LoansPayableNoncurrentGross_08B6C8183047B5406E01F78CCFDE754B_terseLabel_en-US" xlink:label="lab_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross term loan</link:label>
    <link:label id="lab_abm_LoansPayableNoncurrentGross_08B6C8183047B5406E01F78CCFDE754B_label_en-US" xlink:label="lab_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable, Noncurrent, Gross</link:label>
    <link:label id="lab_abm_LoansPayableNoncurrentGross_08B6C8183047B5406E01F78CCFDE754B_documentation_en-US" xlink:label="lab_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loans Payable, Noncurrent, Gross</link:label>
    <link:loc xlink:href="abm-20180731.xsd#abm_LoansPayableNoncurrentGross" xlink:label="loc_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:to="lab_abm_LoansPayableNoncurrentGross_D586C7588ACE55448B54CDCD73F42D1B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CB84127A2CCFE92A354DF78CD09F7D76_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_7D181F3BC7005277A36CDD6F4218C33F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: unamortized deferred financing costs</link:label>
    <link:label id="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CB84127A2CCFE92A354DF78CD09F7D76_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_7D181F3BC7005277A36CDD6F4218C33F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs, Noncurrent, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_7D181F3BC7005277A36CDD6F4218C33F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermLoansPayable_4F9886F9B80FDF3BA38EF78CD13424AC_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermLoansPayable_7C338B323DF3566A9A721CBF2B57B404" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total noncurrent portion of term loan</link:label>
    <link:label id="lab_us-gaap_LongTermLoansPayable_4F9886F9B80FDF3BA38EF78CD13424AC_label_en-US" xlink:label="lab_us-gaap_LongTermLoansPayable_7C338B323DF3566A9A721CBF2B57B404" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermLoansPayable" xlink:label="loc_us-gaap_LongTermLoansPayable_7C338B323DF3566A9A721CBF2B57B404" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermLineOfCredit_E434B9690CA61C43665EF78CD1CFDE9D_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermLineOfCredit_514C1B647C2A568DB4CFD8A693C9D3E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit</link:label>
    <link:label id="lab_us-gaap_LongTermLineOfCredit_E434B9690CA61C43665EF78CD1CFDE9D_label_en-US" xlink:label="lab_us-gaap_LongTermLineOfCredit_514C1B647C2A568DB4CFD8A693C9D3E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_468E98E85910E078C2B4F78CD279C752_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_174140E402AD5D108BBFDE2BCA23B176" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Long-term debt</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_224845827515D19789CEF79827005F1B_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_0AB29800CE8C5B39B4A46FF03CCC19E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowing capacity</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_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_0AB29800CE8C5B39B4A46FF03CCC19E0" xlink:type="locator" />
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