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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-06-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001809104</issuerCik>
        <issuerName>Alight, Inc. / Delaware</issuerName>
        <issuerTradingSymbol>ALIT</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000903213</rptOwnerCik>
            <rptOwnerName>FOLEY WILLIAM P II</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O ALIGHT, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>510 LAKE COOK ROAD, SUITE 400</rptOwnerStreet2>
            <rptOwnerCity>DEERFIELD</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60015</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-06-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1590</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>11.20</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50645</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>341664</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See notes</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Quarterly award of shares elected in lieu of cash retainer of $17,812 for service as a member of the Board of Directors and granted pursuant to the Alight, Inc. 2021 Omnibus Incentive Plan.   The number of shares granted was calculated by dividing the cash retainer by $11.20, the closing price of the Issuer's ordinary shares on June 30, 2026, as adjusted to reflect the 1-for-20 reverse stock split of the Issuer's Class A common stock on such date, and rounding down to the next whole share.</footnote>
        <footnote id="F2">Includes restricted stock units scheduled to vest in the future.</footnote>
        <footnote id="F3">Securities listed in this filing have been adjusted to reflect a 1-for-20 reverse split of the Issuer's Class A common stock effective as of June 30, 2026.</footnote>
        <footnote id="F4">Represents 8,593 shares of Class A common stock directly held by Trasimene Capital FT, LLC and 333,071 shares of Class A common stock directly held by Bilcar FT, LP.</footnote>
        <footnote id="F5">Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Age of 1934, as amended (the &quot;Exchange Act&quot;), this filing shall not be deemed an admission that the Reporting Person is, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owner of any equity securities in excess of his pecuniary interest.</footnote>
        <footnote id="F6">William P. Foley, II (the &quot;Reporting Person&quot;) is the sole member of Bilcar FT, LLC, which, in turn, is the sole general partner of Bilcar FT, LP (&quot;Bilcar&quot;). The Reporting Person is also the sole member of Trasimene Capital FT, LLC (&quot;Trasimene GP&quot;). Because of the relationships between the Reporting Person and Bilcar, Bilcar FT, LLC and Trasimene GP, the Reporting Person may be deemed to beneficially own the securities reported herein to the extent of his pecuniary interests. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein, if any.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ John A. Mikowski, Deputy General Counsel and Assistant Corporate Secretary, as Attorney-in-Fact</signatureName>
        <signatureDate>2026-07-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
