<SEC-DOCUMENT>0001628280-17-004824.txt : 20170503
<SEC-HEADER>0001628280-17-004824.hdr.sgml : 20170503
<ACCEPTANCE-DATETIME>20170503182723
ACCESSION NUMBER:		0001628280-17-004824
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170501
FILED AS OF DATE:		20170503
DATE AS OF CHANGE:		20170503

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RYDER SYSTEM INC
		CENTRAL INDEX KEY:			0000085961
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-AUTO RENTAL & LEASING (NO DRIVERS) [7510]
		IRS NUMBER:				590739250
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11690 N.W. 105TH STREET
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33178
		BUSINESS PHONE:		3055003726

	MAIL ADDRESS:	
		STREET 1:		11690 N.W. 105TH STREET
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33178

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kirk Melvin L.
		CENTRAL INDEX KEY:			0001663092

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04364
		FILM NUMBER:		17811040

	MAIL ADDRESS:	
		STREET 1:		11690 N.W. 105TH STREET
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33178
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_149385042866856.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-05-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000085961</issuerCik>
        <issuerName>RYDER SYSTEM INC</issuerName>
        <issuerTradingSymbol>R</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001663092</rptOwnerCik>
            <rptOwnerName>Kirk Melvin L.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>11690 N.W. 105 STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MIAMI</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33178</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP &amp; CIO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-05-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>683</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>68.07</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7429</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock withheld by the Company for the payment of taxes due upon the vesting of restricted stock rights granted to the reporting person on May 1, 2014.</footnote>
        <footnote id="F2">Includes 30 shares of common stock acquired by the reporting person under the Company's dividend reinvestment plan since the date of the reporting person's last Section 16 filing.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Julie A. Azuaje, by power of attorney</signatureName>
        <signatureDate>2017-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
