<SEC-DOCUMENT>0001179110-17-008872.txt : 20170612
<SEC-HEADER>0001179110-17-008872.hdr.sgml : 20170612
<ACCEPTANCE-DATETIME>20170612133104
ACCESSION NUMBER:		0001179110-17-008872
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170608
FILED AS OF DATE:		20170612
DATE AS OF CHANGE:		20170612

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Willdan Group, Inc.
		CENTRAL INDEX KEY:			0001370450
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ENGINEERING SERVICES [8711]
		IRS NUMBER:				141951112
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
		CITY:			ANAHEIM
		STATE:			CA
		ZIP:			92806
		BUSINESS PHONE:		800-424-9144

	MAIL ADDRESS:	
		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
		CITY:			ANAHEIM
		STATE:			CA
		ZIP:			92806

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Westfall Win
		CENTRAL INDEX KEY:			0001378183

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33076
		FILM NUMBER:		17905734

	MAIL ADDRESS:	
		STREET 1:		2401 EAST KATELLA AVENUE
		STREET 2:		SUITE 300
		CITY:			ANAHEIM
		STATE:			CA
		ZIP:			92806
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-06-08</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001370450</issuerCik>
        <issuerName>Willdan Group, Inc.</issuerName>
        <issuerTradingSymbol>WLDN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001378183</rptOwnerCik>
            <rptOwnerName>Westfall Win</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2401 EAST KATELLA AVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>ANAHEIM</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92806</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-06-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1474</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21657</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The shares vest in three substantially equal installments on each of June 8, 2018, June 8, 2019 and June 8, 2020.</footnote>
        <footnote id="F2">Includes 1,200 shares of restricted stock that vest on June 5, 2018 and 4,583 shares of restricted stock that vest in three substantially equal installments on each of June 9, 2017, June 9, 2018 and June 9, 2019.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Stacy B. McLaughlin, Attorney-in-Fact for Win Westfall</signatureName>
        <signatureDate>2017-06-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
