<?xml version="1.0"?>
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    <schemaVersion>X0306</schemaVersion>

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    <periodOfReport>2019-12-17</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
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        <issuerName>TIFFANY &amp; CO</issuerName>
        <issuerTradingSymbol>TIF</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>Galtie Philippe</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TIFFANY &amp; CO.</rptOwnerStreet1>
            <rptOwnerStreet2>200 FIFTH AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10010</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
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                    <value>67</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <footnoteId id="F2"/>
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        <derivativeTransaction>
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                <value>Performance-based Restricted Stock Units</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
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                <value>2019-12-17</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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        <derivativeTransaction>
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                <value>Dividend Equivalent Units</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F6"/>
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            <transactionDate>
                <value>2019-12-17</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                    <value>D</value>
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                <underlyingSecurityShares>
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                    <value>1447</value>
                </sharesOwnedFollowingTransaction>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents the accelerated vesting of 770 restricted stock units initially scheduled to vest on January 19, 2020, and 770 restricted stock units initially scheduled to vest on January 19, 2021, in each case on December 17, 2019.</footnote>
        <footnote id="F2">Settlement of dividend equivalent units in connection with vesting of restricted stock units. The dividend equivalent units accrued when and as dividends were paid on the issuer's common stock and vested proportionately with the restricted stock units to which they relate. The dividend equivalent units convert to the issuer's common stock on a one-for-one basis.</footnote>
        <footnote id="F3">Shares withheld to cover taxes on vested restricted stock units and dividend equivalent units pursuant to issuer's default equity vesting procedures.</footnote>
        <footnote id="F4">Represents the accelerated vesting of 1,361 restricted stock units, initially scheduled to vest on July 19, 2020, on December 17, 2019.</footnote>
        <footnote id="F5">Each performance-based restricted stock unit represents a contingent right to receive a share of issuer's common stock upon satisfaction of financial performance criteria for the three-year performance period ending January 31, 2020 and publication of issuer's audited financial statements for the fiscal year ending on that date. 12,306 performance-based restricted stock units were granted pursuant to the Tiffany &amp; Co. 2014 Employee Incentive Plan, which complies with Rule 16b-3. The vesting of 4,663 of such performance-based restricted stock units, which were projected to vest and be earned in March 2020, was accelerated to December 17, 2019.</footnote>
        <footnote id="F6">Settlement of dividend equivalent units in connection with vesting of performance-based stock units. The dividend equivalent units accrued when and as dividends were paid on the issuer's common stock and vested proportionately with the performance-based stock units to which they relate. The dividend equivalent units convert to the issuer's common stock on a one-for-one basis.</footnote>
        <footnote id="F7">Shares withheld to cover taxes on vested performance-based restricted stock units pursuant to issuer's default equity vesting procedures.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Catherine W.H. So, Attorney-in-Fact</signatureName>
        <signatureDate>2019-12-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2019-12-17
0
0000098246
TIFFANY & CO
TIF
0001651698
Galtie Philippe
TIFFANY & CO.
200 FIFTH AVENUE
NEW YORK
NY
10010
0
1
0
0
Executive Vice President
Common Stock $.01 Par
2019-12-17
4
M
0
1540
A
11983
D
Common Stock $.01 Par
2019-12-17
4
M
0
92
A
12075
D
Common Stock $.01 Par
2019-12-17
4
F
0
870
133.685
D
11205
D
Common Stock $.01 Par
2019-12-17
4
M
0
1361
A
12566
D
Common Stock $.01 Par
2019-12-17
4
M
0
67
A
12633
D
Common Stock $.01 Par
2019-12-17
4
F
0
760
133.685
D
11873
D
Common Stock $.01 Par
2019-12-17
4
M
0
4663
A
16536
D
Common Stock $.01 Par
2019-12-17
4
M
0
281
A
16817
D
Common Stock $.01 Par
2019-12-17
4
F
0
2631
133.685
D
14186
D
Restricted Stock Units
2019-12-17
4
M
0
1540
0
D
Common Stock $.01 Par
1540.0
0
D
Dividend Equivalent Units
2019-12-17
4
M
0
92
0
D
Common Stock $.01 Par
92.0
1795
D
Common Stock $.01 Par
2019-12-17
4
M
0
1361
0
D
Common Stock $.01 Par
1361.0
1361
D
Dividend Equivalent Units
2019-12-17
4
M
0
67
0
D
Common Stock $.01 Par
67.0
1728
D
Performance-based Restricted Stock Units
2019-12-17
4
M
0
4663
0
D
Common Stock $.01 Par
4663.0
7643
D
Dividend Equivalent Units
2019-12-17
4
M
0
281
0
D
Common Stock $.01 Par
281.0
1447
D
Represents the accelerated vesting of 770 restricted stock units initially scheduled to vest on January 19, 2020, and 770 restricted stock units initially scheduled to vest on January 19, 2021, in each case on December 17, 2019.
Settlement of dividend equivalent units in connection with vesting of restricted stock units. The dividend equivalent units accrued when and as dividends were paid on the issuer's common stock and vested proportionately with the restricted stock units to which they relate. The dividend equivalent units convert to the issuer's common stock on a one-for-one basis.
Shares withheld to cover taxes on vested restricted stock units and dividend equivalent units pursuant to issuer's default equity vesting procedures.
Represents the accelerated vesting of 1,361 restricted stock units, initially scheduled to vest on July 19, 2020, on December 17, 2019.
Each performance-based restricted stock unit represents a contingent right to receive a share of issuer's common stock upon satisfaction of financial performance criteria for the three-year performance period ending January 31, 2020 and publication of issuer's audited financial statements for the fiscal year ending on that date. 12,306 performance-based restricted stock units were granted pursuant to the Tiffany & Co. 2014 Employee Incentive Plan, which complies with Rule 16b-3. The vesting of 4,663 of such performance-based restricted stock units, which were projected to vest and be earned in March 2020, was accelerated to December 17, 2019.
Settlement of dividend equivalent units in connection with vesting of performance-based stock units. The dividend equivalent units accrued when and as dividends were paid on the issuer's common stock and vested proportionately with the performance-based stock units to which they relate. The dividend equivalent units convert to the issuer's common stock on a one-for-one basis.
Shares withheld to cover taxes on vested performance-based restricted stock units pursuant to issuer's default equity vesting procedures.
/s/ Catherine W.H. So, Attorney-in-Fact
2019-12-20