<SEC-DOCUMENT>0001284084-18-000026.txt : 20180329
<SEC-HEADER>0001284084-18-000026.hdr.sgml : 20180329
<ACCEPTANCE-DATETIME>20180329140854
ACCESSION NUMBER:		0001284084-18-000026
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170921
FILED AS OF DATE:		20180329
DATE AS OF CHANGE:		20180329

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			The Ronald D Croatti Trust - 1993
		CENTRAL INDEX KEY:			0001724901

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08504
		FILM NUMBER:		18722291

	MAIL ADDRESS:	
		STREET 1:		C/O CAROL CROATTI
		STREET 2:		21 JEFFERSON DRIVE
		CITY:			LONDONDERRY
		STATE:			NH
		ZIP:			03053

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNIFIRST CORP
		CENTRAL INDEX KEY:			0000717954
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PERSONAL SERVICES [7200]
		IRS NUMBER:				042103460
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0830

	BUSINESS ADDRESS:	
		STREET 1:		68 JONSPIN RD
		CITY:			WILMINGTON
		STATE:			MA
		ZIP:			01887
		BUSINESS PHONE:		(978) 658-8888

	MAIL ADDRESS:	
		STREET 1:		68 JONSPIN ROAD
		CITY:			WILMINGTON
		STATE:			MA
		ZIP:			01887

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERSTATE UNIFORM SERVICES CORP/MA
		DATE OF NAME CHANGE:	19840410
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_152234689942523.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-09-21</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000717954</issuerCik>
        <issuerName>UNIFIRST CORP</issuerName>
        <issuerTradingSymbol>UNF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001724901</rptOwnerCik>
            <rptOwnerName>The Ronald D Croatti Trust - 1993</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>68 JONSPIN ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WILMINGTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01887</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock ($0.10 par value)</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2750905.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each share of Class B Common Stock is convertible at any time by the holder into one share of Common Stock.  Each share of Class B Common Stock automatically converts into one share of Common Stock upon transfer to a recipient that is not a permitted transferee or upon termination of the Class B Common Stock, in each case in accordance with the terms of the charter of UniFirst Corporation.</footnote>
        <footnote id="F2">Includes 1,734,986 shares owned directly by The Queue Limited Partnership and 199 shares owned directly by Queue Management Associates, Inc.  Queue Management Associates, Inc. is the general partner of The Queue Limited Partnership. The Ronald D. Croatti Trust  1993 (of which Carol Croatti and Matthew Croatti are the trustees and Carol Croatti is the beneficiary), Cynthia Croatti and Cecilia Levenstein are the sole shareholders of Queue Management Associates, Inc., and Carol Croatti, Cynthia Croatti and Cecelia Levenstein are the directors of Queue Management Associates, Inc. Cynthia Croatti and Cecelia Levenstein are trustees, co-trustees and in some cases beneficiaries, and in some cases their children are beneficiaries, of various trusts which hold limited partnership interests in The Queue Limited Partnership.  Ronald D. Croatti's children are beneficiaries of certain trusts which hold limited partnership interests in The Queue Limited Partnership.</footnote>
        <footnote id="F3">Includes 1,015,717 shares owned directly by The Red Cat Limited Partnership and 3 shares owned directly by Red Cat Management Associates, Inc.  Red Cat Management Associates, Inc. is the general partner of The Red Cat Limited Partnership. The Ronald D. Croatti Trust - 1993 and Cynthia Croatti are the sole shareholders of Red Cat Management Associates, Inc. and Carol Croatti and Cynthia Croatti are the directors of Red Cat Management Associates, Inc. Cynthia Croatti and Cecelia Levenstein are trustees, co-trustees and in the case of Cynthia Croatti a beneficiary of certain trusts which hold limited partnership interests in The Red Cat Limited Partnership. Ronald D. Croatti's children are beneficiaries of a trust which hold limited partnership interests in The Red Cat Limited Partnership.</footnote>
        <footnote id="F4">Each of the aforementioned reporting persons disclaims beneficial ownership of these reported securities, except to the extent of his, her or its pecuniary interest, if any, therein, and this report shall not be deemed an admission that such persons are the beneficial owners of these securities for purposes of Section 16 or any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ David Whitman, Attorney-in-Fact</signatureName>
        <signatureDate>2018-03-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex-24.htm
<DESCRIPTION>THE RONALD D. CROATTI TRUST 1993 POWER OF ATTORNEY
<TEXT>
<!-- Document created using Workiva -->
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<body>
<pre>
LIMITED POWER OF ATTORNEY
FOR
UNIFIRST CORPORATION
SECTION 16(a) FILINGS

December 5, 2017

Know all by these presents that the undersigned hereby revokes all previous Powers of Attorney executed by the undersigned with respect to the matters set forth below and hereby constitutes and appoints each of Steven S. Sintros, Erik Bello, Karla Davis and David Whitman with full power of substitution, signing singly, the undersigned's true and lawful attorney-in-fact to:

    (1)    execute for and on behalf of the undersigned, in the undersigned's capacity as a stockholder of UniFirst Corporation (the "Company"), Forms 3, 4, and 5 and amendments thereto in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended, and the rules thereunder;

    (2)    do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5 or amendment thereto and timely file such forms with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority; and

    (3)    take any other action of any type whatsoever which, in the opinion of such attorney-in-fact, may be necessary or desirable in connection with the foregoing authority, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Limited Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve.

    The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Limited Power of Attorney and the rights and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended, and the rules thereunder.

    This Limited Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities of the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.  This Limited Power of Attorney may be filed with the SEC as a confirming statement of the authority granted herein.
    IN WITNESS WHEREOF, the undersigned has caused this Limited Power of Attorney to be executed as of the date first written above.

                                 THE RONALD D. CROATTI TRUST  1993


    By:  /s/ Carol Croatti
            Carol Croatti, Trustee


    By:  /s/ Matthew Croatti________________
            Matthew Croatti, Trustee
</pre>
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