<SEC-DOCUMENT>0001523711-21-000044.txt : 20210528
<SEC-HEADER>0001523711-21-000044.hdr.sgml : 20210528
<ACCEPTANCE-DATETIME>20210528184327
ACCESSION NUMBER:		0001523711-21-000044
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210526
FILED AS OF DATE:		20210528
DATE AS OF CHANGE:		20210528

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FERGUSON DIANA SUE
		CENTRAL INDEX KEY:			0001275975

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05647
		FILM NUMBER:		21982197

	MAIL ADDRESS:	
		STREET 1:		C/O SARA LEE CORP
		STREET 2:		70 W MADISO ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60602

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MATTEL INC /DE/
		CENTRAL INDEX KEY:			0000063276
		STANDARD INDUSTRIAL CLASSIFICATION:	DOLLS & STUFFED TOYS [3942]
		IRS NUMBER:				951567322
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		333 CONTINENTAL BLVD
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
		BUSINESS PHONE:		3102522000
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_162224179108226.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-05-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000063276</issuerCik>
        <issuerName>MATTEL INC /DE/</issuerName>
        <issuerTradingSymbol>MAT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001275975</rptOwnerCik>
            <rptOwnerName>FERGUSON DIANA SUE</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>333 CONINTENTAL BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EL SEGUNDO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90245</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-05-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7539</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7539.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7539</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Restricted Stock Units (&quot;RSUs&quot;) were granted on May 26, 2021, pursuant to the Mattel, Inc. Amended and Restated 2010 Equity and Long-Term Compensation Plan, as amended. Each RSU represents a contingent right to receive one share of Common Stock (or, at the election of Mattel, Inc., a cash amount equal to the fair market value of such share on the settlement date). The RSUs are accompanied by dividend equivalent rights.</footnote>
        <footnote id="F2">The RSUs are fully vested on the date of grant. Vested RSUs generally will be settled on the third anniversary of the date of grant. On the settlement date, for each vested RSU, the Reporting Person will receive one share of Common Stock (or, at the election of Mattel, Inc., a cash amount equal to the fair market value of one share of Common Stock on the settlement date).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Tiffani Magri, Attorney-in-Fact for Diana S. Ferguson</signatureName>
        <signatureDate>2021-05-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
