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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-01-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001556593</issuerCik>
        <issuerName>Rithm Capital Corp.</issuerName>
        <issuerTradingSymbol>RITM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001571610</rptOwnerCik>
            <rptOwnerName>SANTORO NICOLA JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>799 BROADWAY</rptOwnerStreet1>
            <rptOwnerStreet2>8TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10003</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-01-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>169885</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>278011</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Profits Units of Rithm Capital Management LLC</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2026-01-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>39961</value>
                    <footnoteId id="F5"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>39961</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>79919</value>
                    <footnoteId id="F7"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Profits Units of Rithm Capital Management LLC</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2026-01-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>31410</value>
                    <footnoteId id="F8"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>31410</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>31410</value>
                    <footnoteId id="F9"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents performance-based restricted stock units granted under the Rithm Capital Corp. Nonqualified Stock Option and Incentive Award Plan and earned based on the three-year average annual return on equity over the period starting January 1, 2023 and ending December 31, 2025, as certified by the Compensation Committee on January 20, 2026. As of January 20, 2026, the performance-based criteria have been satisfied for all of the units, and the units will vest on February 21, 2026.</footnote>
        <footnote id="F2">The reported amount also includes 38,583 dividend equivalent rights accrued with respect to the performance-based restricted stock units. Dividend equivalent performance-based restricted stock units vest on the same schedule and are subject to the same terms and conditions as the underlying awards.</footnote>
        <footnote id="F3">Includes 198,197 unvested restricted stock units.</footnote>
        <footnote id="F4">Class B Profits Units of Rithm Capital Management LLC (&quot;RCM&quot;) will be exchangeable into shares of Common Stock of the Issuer on a one-for-one basis pursuant to the terms and conditions set forth in the Rithm Capital Management LLC Long Term Incentive Plan and the individual award agreement.</footnote>
        <footnote id="F5">Represents Class B Profits Units in RCM earned based on annual return on equity for the 2025 performance period, as certified by the Compensation Committee on January 20, 2026. As of January 20, 2026, performance-based criteria have been satisfied for 2 of the 3 tranches.</footnote>
        <footnote id="F6">These Class B Profits Units will be exchangeable into shares of Common Stock of the Issuer on a one-for-one basis after they have become vested and a sufficient amount of profits have been allocated to the holder of the Class B Profits Units.</footnote>
        <footnote id="F7">The reported amount also includes 11,386 dividend equivalent rights accrued with respect to the earned Class B Profits Units. Dividend equivalent Class B Profits Units vest on the same schedule and are subject to the same terms and conditions as the underlying awards.</footnote>
        <footnote id="F8">Represents Class B Profits Units in RCM earned based on annual return on equity for the 2025 performance period, as certified by the Compensation Committee on January 20, 2026. As of January 20, 2026, performance-based criteria have been satisfied for 1 of the 3 tranches.</footnote>
        <footnote id="F9">The reported amount also includes 1,976 dividend equivalent rights accrued with respect to the earned Class B Profits Units. Dividend equivalent Class B Profits Units vest on the same schedule and are subject to the same terms and conditions as the underlying awards.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Nicola Santoro, Jr.</signatureName>
        <signatureDate>2026-01-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
