<SEC-DOCUMENT>0001179110-20-001594.txt : 20200214
<SEC-HEADER>0001179110-20-001594.hdr.sgml : 20200214
<ACCEPTANCE-DATETIME>20200214125130
ACCESSION NUMBER:		0001179110-20-001594
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20191231
FILED AS OF DATE:		20200214
DATE AS OF CHANGE:		20200214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Welch John R.
		CENTRAL INDEX KEY:			0001611303

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34223
		FILM NUMBER:		20617042

	MAIL ADDRESS:	
		STREET 1:		84 SUMMER STREET
		CITY:			WESTON
		STATE:			MA
		ZIP:			02493

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CLEAN HARBORS INC
		CENTRAL INDEX KEY:			0000822818
		STANDARD INDUSTRIAL CLASSIFICATION:	HAZARDOUS WASTE MANAGEMENT [4955]
		IRS NUMBER:				042997780
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		42 LONGWATER DRIVE
		STREET 2:		P.O. BOX 9149
		CITY:			NORWELL
		STATE:			MA
		ZIP:			02061-9149
		BUSINESS PHONE:		781-792-5000

	MAIL ADDRESS:	
		STREET 1:		42 LONGWATER DRIVE
		CITY:			NORWELL
		STATE:			MA
		ZIP:			02061-9149
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 5 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2019-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000822818</issuerCik>
        <issuerName>CLEAN HARBORS INC</issuerName>
        <issuerTradingSymbol>CLH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611303</rptOwnerCik>
            <rptOwnerName>Welch John R.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>84 SUMMER STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WESTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02493</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11992</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Item 5,  Amount of Securities Beneficially Owned at end of Issuer's Fiscal Year, reduced to reflect inadvertent reporting of 6,588 shares of stock not actually owned on Form 3, dated 06/19/2014.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>John R. Welch</signatureName>
        <signatureDate>2020-02-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
