<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-11-30</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001679049</issuerCik>
        <issuerName>International Seaways, Inc.</issuerName>
        <issuerTradingSymbol>INSW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000075208</rptOwnerCik>
            <rptOwnerName>OVERSEAS SHIPHOLDING GROUP INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TWO HARBOUR PLACE</rptOwnerStreet1>
            <rptOwnerStreet2>302 KNIGHTS RUN AVENUE, SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33602</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, no par value</value>
            </securityTitle>
            <transactionDate>
                <value>2016-11-30</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2016-11-30</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>29157387</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On November 30, 2016 at 5:00 p.m., all of the outstanding shares of common stock of International Seaways, Inc. (&quot;INSW&quot;) were distributed by Overseas Shipholding Group, Inc. (&quot;OSG&quot;) to OSG's shareholders.</footnote>
        <footnote id="F2">On November 30, 2016, simultaneously with the effectiveness of the amended and restated articles of incorporation of INSW that increased the number of authorized shares of INSW common stock, no par value, to 100,000,000, INSW effected a stock split (the &quot;Stock Split&quot;).  Prior to the Stock Split, OSG owned 102.21 shares of INSW common stock and, as a result of the Stock Split, such shares of INSW common stock became 29,157,387 shares of INSW common stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Rick Oricchio, Senior Vice President &amp; Chief Financial Officer of Overseas Shipholding Group, Inc.</signatureName>
        <signatureDate>2016-12-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
