<?xml version="1.0"?>
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        <issuerName>UNITED TECHNOLOGIES CORP /DE/</issuerName>
        <issuerTradingSymbol>UTX</issuerTradingSymbol>
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            <rptOwnerName>BUCKNALL WILLIAM L JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2>ONE FINANCIAL PLAZA</rptOwnerStreet2>
            <rptOwnerCity>HARTFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06101</rptOwnerZipCode>
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            <officerTitle>SVP, Human  Resources &amp; Org.</officerTitle>
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                </transactionPricePerShare>
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                    <value>100839.0000</value>
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                    <value>D</value>
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                    <value></value>
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                <value>Common Stock</value>
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            <transactionCoding>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>22100</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>66.1000</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                    <value>78739.0000</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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            </transactionDate>
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                <transactionCode>S</transactionCode>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
                    <value>66.0000</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>63739.0000</value>
                    <footnoteId id="F1"/>
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                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
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        <nonDerivativeHolding>
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                <value>Common Stock</value>
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                    <value>1872.8200</value>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Savings Plan Trustee</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>27.0000</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-11-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>120000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2002-01-04</value>
            </exerciseDate>
            <expirationDate>
                <value>2009-01-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>120000.0000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0.0000</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>31.2500</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-11-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>30920</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2003-01-03</value>
            </exerciseDate>
            <expirationDate>
                <value>2010-01-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>30920.0000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>69080.0000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person also directly owns 27,448 shares of United Technologies Career Restricted Common Stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>By: /s/ Charles F. Hildebrand as Attorney-in-Fact</signatureName>
        <signatureDate>2006-11-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2006-11-22
0
0000101829
UNITED TECHNOLOGIES CORP /DE/
UTX
0001184182
BUCKNALL WILLIAM L JR
UNITED TECHNOLOGIES CORPORATION
ONE FINANCIAL PLAZA
HARTFORD
CT
06101
0
1
0
0
SVP, Human  Resources & Org.
Common Stock
2006-11-22
4
M
0
120000
27.0000
A
183739.0000
D
Common Stock
2006-11-22
4
M
0
30920
31.2500
A
214659.0000
D
Common Stock
2006-11-22
4
S
0
13800
65.8000
D
200859.0000
D
Common Stock
2006-11-22
4
S
0
30000
65.8200
D
170859.0000
D
Common Stock
2006-11-22
4
S
0
10000
65.8300
D
160859.0000
D
Common Stock
2006-11-22
4
S
0
5000
65.8384
D
155859.0000
D
Common Stock
2006-11-22
4
S
0
5000
65.8128
D
150859.0000
D
Common Stock
2006-11-22
4
S
0
4720
65.8400
D
146139.0000
D
Common Stock
2006-11-22
4
S
0
10300
65.8500
D
135839.0000
D
Common Stock
2006-11-22
4
S
0
10000
65.9000
D
125839.0000
D
Common Stock
2006-11-22
4
S
0
5000
65.9500
D
120839.0000
D
Common Stock
2006-11-22
4
S
0
15000
66.0517
D
105839.0000
D
Common Stock
2006-11-22
4
S
0
5000
65.8522
D
100839.0000
D
Common Stock
2006-11-22
4
S
0
22100
66.1000
D
78739.0000
D
Common Stock
2006-11-22
4
S
0
15000
66.0000
D
63739.0000
D
Common Stock
1872.8200
I
By Savings Plan Trustee
Non-Qualified Stock Option (right to buy)
27.0000
2006-11-22
4
M
0
120000
0
D
2002-01-04
2009-01-03
Common Stock
120000.0000
0.0000
D
Non-Qualified Stock Option (right to buy)
31.2500
2006-11-22
4
M
0
30920
0
D
2003-01-03
2010-01-02
Common Stock
30920.0000
69080.0000
D
The reporting person also directly owns 27,448 shares of United Technologies Career Restricted Common Stock.
By: /s/ Charles F. Hildebrand as Attorney-in-Fact
2006-11-27