Form N-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM N-Q


QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number         811-6624         

        Nuveen New York Select Tax-Free Income Portfolio         
(Exact name of registrant as specified in charter)


        333 West Wacker Drive, Chicago, Illinois 60606         
(Address of principal executive offices) (Zip code)


Jessica R. Droeger—Vice President and Secretary
        333 West Wacker Drive, Chicago, Illinois 60606         
(Name and address of agent for service)

Registrant's telephone number, including area code:         312-917-7700        

Date of fiscal year end:            3/31          

Date of reporting period:         6/30/06         

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (“OMB”) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments

    Portfolio of Investments (Unaudited)             
    Nuveen New York Select Tax-Free Income Portfolio (NXN)             
    June 30, 2006             
Principal        Optional Call         
Amount (000)    Description    Provisions (1)    Ratings (2)    Value 
    Consumer Discretionary – 0.1%             
$             100    New York City Industrial Development Agency, New York, Liberty Revenue Bonds,    9/15 at 100.00    BBB–   $   100,139 
     IAC/InterActiveCorp, Series 2005, 5.000%, 9/01/35             
    Consumer Staples – 1.9%             
    TSASC Inc., New York, Tobacco Asset-Backed Bonds, Series 2006:             
500     4.750%, 6/01/22    6/16 at 100.00    BBB    494,040 
540     5.000%, 6/01/26    6/16 at 100.00    BBB    529,632 
1,040    Total Consumer Staples            1,023,672 
    Education and Civic Organizations – 7.2%             
1,700    Amherst Industrial Development Agency, New York, Revenue Bonds, UBF Faculty/Student Housing    8/12 at 101.00    AAA    1,751,017 
     Corporation, University of Buffalo Creekside Project, Series 2002A, 5.000%, 8/01/22 –             
     AMBAC Insured             
30    Cattaraugus County Industrial Development Agency, New York, Revenue Bonds, St. Bonaventure    5/16 at 100.00    BBB–    29,779 
     University, Series 2006, 5.000%, 5/01/23             
785    Dormitory Authority of the State of New York, Insured Revenue Bonds, Iona College, Series    7/12 at 100.00    AAA    800,276 
     2002, 5.000%, 7/01/22 – XLCA Insured             
405    Dormitory Authority of the State of New York, Second General Resolution Consolidated Revenue    No Opt. Call    AAA    434,363 
     Bonds, City University System, Series 1990C, 7.500%, 7/01/10 – FGIC Insured             
100    Hempstead Town Industrial Development Agency, New York, Revenue Bonds, Adelphi University,    10/15 at 100.00    A–    100,323 
     Civic Facility Project, Series 2005, 5.000%, 10/01/35             
100    New York City Industrial Development Agency, New York, Civic Facility Revenue Bonds, St.    10/14 at 100.00    A–    100,046 
     Francis College, Series 2004, 5.000%, 10/01/34             
500    New York City Industrial Development Agency, New York, Civic Facility Revenue Bonds, YMCA of    2/11 at 100.00    A–    510,275 
     Greater New York, Series 2002, 5.250%, 8/01/21             
200    Puerto Rico Industrial, Tourist, Educational, Medical and Environmental Control Facilities    2/09 at 101.00    BBB–    202,744 
     Financing Authority, Higher Education Revenue Bonds, Ana G. Mendez University System,             
     Series 1999, 5.375%, 2/01/19             
3,820    Total Education and Civic Organizations            3,928,823 
    Health Care – 13.1%             
450    Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Montefiore    2/15 at 100.00    AAA    459,270 
     Hospital, Series 2004, 5.000%, 8/01/29 – FGIC Insured             
    Dormitory Authority of the State of New York, Revenue Bonds, Lenox Hill Hospital Obligated             
    Group, Series 2001:             
110     5.375%, 7/01/20    7/11 at 101.00    Ba2    111,774 
100     5.500%, 7/01/30    7/11 at 101.00    Ba2    101,247 
500    Dormitory Authority of the State of New York, Revenue Bonds, Memorial Sloan Kettering Cancer    7/16 at 100.00    AA    508,465 
     Center, Series 2006-1, 5.000%, 7/01/35             
670    Dormitory Authority of the State of New York, Revenue Bonds, Memorial Sloan-Kettering Cancer    7/13 at 100.00    AAA    692,164 
     Center, Series 2003-1, 5.000%, 7/01/21 – MBIA Insured             
415    Dormitory Authority of the State of New York, Revenue Bonds, New York and Presbyterian    8/14 at 100.00    AAA    440,108 
     Hospital, Series 2004A, 5.250%, 8/15/15 – FSA Insured             
250    Dormitory Authority of the State of New York, Revenue Bonds, North Shore Long Island Jewish    5/13 at 100.00    A3    259,530 
     Group, Series 2003, 5.375%, 5/01/23             
1,680    Dormitory Authority of the State of New York, Revenue Bonds, Winthrop South Nassau University    7/11 at 101.00    AAA    1,770,468 
     Health System Obligated Group, Series 2001A, 5.250%, 7/01/17 – AMBAC Insured             
1,195    Dormitory Authority of the State of New York, Revenue Bonds, Winthrop South Nassau University    7/11 at 101.00    AAA    1,259,351 
     Health System Obligated Group, Series 2001B, 5.250%, 7/01/17 – AMBAC Insured             
500    Dormitory Authority of the State of New York, Revenue Bonds, Winthrop-South Nassau University    7/13 at 100.00    Baa1    512,395 
     Hospital Association, Series 2003A, 5.500%, 7/01/32             
750    New York City Health and Hospitals Corporation, New York, Health System Revenue Bonds, Series    2/13 at 100.00    AAA    788,895 
     2003A, 5.250%, 2/15/21 – AMBAC Insured             
250    New York City Industrial Development Agency, New York, Civic Facility Revenue Bonds, Staten    7/12 at 101.00    B2    253,708 
     Island University Hospital, Series 2002C, 6.450%, 7/01/32             
6,870    Total Health Care            7,157,375 
    Housing/Multifamily – 5.1%             
1,000    East Rochester Housing Authority, New York, Revenue Bonds, GNMA/FHA-Secured Revenue Bonds, St.    12/12 at 103.00    AAA    1,057,770 
     Mary’s Residence Project, Series 2002A, 5.375%, 12/20/22             
1,000    New Hartford-Sunset Woods Funding Corporation, New York, FHA-Insured Mortgage Revenue Bonds,    8/12 at 101.00    AAA    1,050,820 
     Sunset Woods Apartments II Project, Series 2002, 5.350%, 2/01/20             
250    New York City Housing Development Corporation, New York, Multifamily Housing Revenue Bonds,    5/14 at 100.00    AA    258,330 
     Series 2004A, 5.250%, 11/01/30             
160    New York City Housing Development Corporation, New York, Multifamily Housing Revenue Bonds,    11/15 at 100.00    AA    157,622 
     Series 2005F-1, 4.750%, 11/01/35             
295    New York State Housing Finance Agency, FHA-Insured Multifamily Housing Mortgage Revenue Bonds,    8/06 at 100.00    AAA    295,392 
     Series 1992C, 6.450%, 8/15/14 – MBIA Insured             
2,705    Total Housing/Multifamily            2,819,934 
    Housing/Single Family – 8.3%             
2,000    New York State Mortgage Agency, Homeowner Mortgage Revenue Bonds, Series 101, 5.000%, 10/01/18    10/11 at 100.00    Aa1    2,017,760 
     (Alternative Minimum Tax)             
2,500    New York State Mortgage Agency, Mortgage Revenue Bonds, Thirty-First Series A, 5.300%,    4/11 at 100.00    Aaa    2,526,025 
     10/01/31 (Alternative Minimum Tax)             
4,500    Total Housing/Single Family            4,543,785 
    Long-Term Care – 9.3%             
2,000    Dormitory Authority of the State of New York, FHA-Insured Nursing Home Mortgage Revenue Bonds,    8/11 at 101.00    AAA    2,046,760 
     Norwegian Christian Home and Health Center, Series 2001, 5.200%, 8/01/36 – MBIA Insured             
50    Dormitory Authority of the State of New York, Revenue Bonds, Providence Rest, Series 2005,    7/15 at 100.00    A    49,810 
     5.000%, 7/01/35 – ACA Insured             
2,000    East Rochester Housing Authority, New York, FHA-Insured Mortgage Revenue Refunding Bonds,    8/12 at 101.00    AAA    2,023,420 
     Jewish Home of Rochester, Series 2002, 4.625%, 2/15/17             
1,000    New York City Industrial Development Agency, New York, GNMA Collateralized Mortgage Revenue    11/12 at 101.00    AA+    1,003,560 
     Bonds, Eger Harbor House Inc., Series 2002A, 4.950%, 11/20/32             
5,050    Total Long-Term Care            5,123,550 
    Tax Obligation/General – 6.3%             
    Clarkstown, Rickland County, New York, Various Purposes Serial Bonds, Series 1992:             
505     5.600%, 6/15/10 – AMBAC Insured    No Opt. Call    AAA    536,542 
525     5.600%, 6/15/11 – AMBAC Insured    No Opt. Call    AAA    563,871 
525     5.600%, 6/15/12 – AMBAC Insured    No Opt. Call    AAA    572,240 
300    New York City, New York, General Obligation Bonds, Fiscal Series 2004C, 5.250%, 8/15/16    8/14 at 100.00    A+    316,596 
500    New York City, New York, General Obligation Bonds, Fiscal Series 2004E, 5.000%, 11/01/19 –    11/14 at 100.00    AAA    520,010 
     FSA Insured             
200    New York City, New York, General Obligation Bonds, Fiscal Series 2005J, 5.000%, 3/01/19 –    3/15 at 100.00    AAA    207,902 
     FGIC Insured             
225    New York City, New York, General Obligation Bonds, Fiscal Series 2006C, 5.000%, 8/01/16 –    8/15 at 100.00    AAA    236,596 
     FSA Insured             
500    West Islip Union Free School District, Suffolk County, New York, General Obligation Bonds,    10/15 at 100.00    Aaa    527,430 
     Series 2005, 5.000%, 10/01/16 – FSA Insured             
3,280    Total Tax Obligation/General            3,481,187 
    Tax Obligation/Limited – 13.4%             
600    Battery Park City Authority, New York, Senior Revenue Bonds, Series 2003A, 5.000%, 11/01/23    11/13 at 100.00    AAA    618,306 
300    Dormitory Authority of the State of New York, Revenue Bonds, Mental Health Services Facilities    No Opt. Call    AAA    316,533 
     Improvements, Series 2005D-1, 5.000%, 2/15/15 – FGIC Insured             
500    Erie County Industrial Development Agency, New York, School Facility Revenue Bonds, Buffalo    5/14 at 100.00    AAA    550,910 
     City School District, Series 2004, 5.750%, 5/01/26 – FSA Insured             
500    Metropolitan Transportation Authority, New York, State Service Contract Refunding Bonds,    7/12 at 100.00    AAA    537,050 
     Series 2002A, 5.500%, 1/01/20 – MBIA Insured             
95    Nassau County Interim Finance Authority, New York, Sales Tax Secured Revenue Bonds, Series    11/06 at 101.00    AAA    96,394 
     2001A-2, 5.125%, 11/15/21 – AMBAC Insured             
    New York City Sales Tax Asset Receivable Corporation, New York, Dedicated Revenue Bonds, Local             
    Government Assistance Corporation, Series 2004A:             
250     5.000%, 10/15/25 – MBIA Insured    10/14 at 100.00    AAA    258,118 
200     5.000%, 10/15/26 – MBIA Insured    10/14 at 100.00    AAA    206,214 
1,225     5.000%, 10/15/29 – AMBAC Insured    10/14 at 100.00    AAA    1,258,810 
670    New York City Transitional Finance Authority, New York, Future Tax Secured Bonds, Fiscal    2/13 at 100.00    AAA    687,159 
     Series 2003E, 5.000%, 2/01/23             
250    New York State Thruway Authority, Highway and Bridge Trust Fund Bonds, Second Generation,    4/14 at 100.00    AAA    258,335 
     Series 2004, 5.000%, 4/01/21 – MBIA Insured             
570    New York State Thruway Authority, Highway and Bridge Trust Fund Bonds, Second Generation,    No Opt. Call    AAA    633,829 
     Series 2005B, 5.500%, 4/01/20 – AMBAC Insured             
    New York State Tobacco Settlement Financing Corporation, Tobacco Settlement Asset-Backed and             
    State Contingency Contract-Backed Bonds, Series 2003A-1:             
1,000     5.250%, 6/01/20 – AMBAC Insured    6/13 at 100.00    AAA    1,050,560 
250     5.250%, 6/01/21 – AMBAC Insured    6/13 at 100.00    AAA    262,335 
500    New York State Tobacco Settlement Financing Corporation, Tobacco Settlement Asset-Backed and    6/13 at 100.00    AA–    530,495 
     State Contingency Contract-Backed Bonds, Series 2003B-1C, 5.500%, 6/01/21             
60    Triborough Bridge and Tunnel Authority, New York, Convention Center Bonds, Series 1990E,    No Opt. Call    AA–    63,814 
     7.250%, 1/01/10             
6,970    Total Tax Obligation/Limited            7,328,862 
    Transportation – 3.8%             
400    Albany Parking Authority, New York, Revenue Bonds, Series 2001A, 5.625%, 7/15/25    7/11 at 101.00    BBB+    418,508 
500    Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series 2003A,    No Opt. Call    AAA    530,235 
     5.000%, 11/15/15 – FGIC Insured             
50    New York State Thruway Authority, General Revenue Bonds, Series 2005F, 5.000%, 1/01/30 –    1/15 at 100.00    AAA    51,164 
     AMBAC Insured             
    New York State Thruway Authority, General Revenue Bonds, Series 2005G:             
100     5.000%, 1/01/30 – FSA Insured    7/15 at 100.00    AAA    102,662 
600     5.000%, 1/01/32 – FSA Insured    7/15 at 100.00    AAA    614,640 
    Port Authority of New York and New Jersey, Consolidated Revenue Bonds, One Hundred Fortieth             
    Series 2005:             
250     5.000%, 12/01/19 – FSA Insured    6/15 at 101.00    AAA    262,183 
105     5.000%, 12/01/31 – XLCA Insured    6/15 at 101.00    AAA    107,527 
2,005    Total Transportation            2,086,919 
    U.S. Guaranteed – 11.6% (3)             
1,000    Dormitory Authority of the State of New York, Insured Revenue Bonds, Rochester Institute of    7/07 at 101.00    AAA    1,024,610 
     Technology, Series 1997, 5.250%, 7/01/22 (Pre-refunded 7/01/07) – MBIA Insured             
1,240    Dormitory Authority of the State of New York, Judicial Facilities Lease Revenue Bonds, Suffolk    No Opt. Call    AAA    1,459,530 
     County Issue, Series 1986, 7.375%, 7/01/16 (ETM)             
320    Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 1998A,    6/08 at 101.00    AAA    331,014 
     5.125%, 12/01/22 (Pre-refunded 6/01/08) – FSA Insured             
750    New York State Thruway Authority, Highway and Bridge Trust Fund Bonds, Second Generation,    4/13 at 100.00    AAA    805,177 
     Series 2003A, 5.250%, 4/01/23 (Pre-refunded 4/01/13) – MBIA Insured             
1,000    New York State Urban Development Corporation, State Personal Income Tax Revenue Bonds, State    3/13 at 100.00    AAA    1,087,860 
     Facilities and Equipment, Series 2002C-1, 5.500%, 3/15/21 (Pre-refunded 3/15/13) – FGIC Insured             
485    Suffolk County Water Authority, New York, Water Revenue Bonds, Series 1986V, 6.750%,    No Opt. Call    AAA    530,309 
     6/01/12 (ETM)             
1,040    TSASC Inc., New York, Tobacco Asset-Backed Bonds, Series 2002-1, 5.500%, 7/15/24    7/12 at 100.00    AAA    1,107,070 
     (Pre-refunded 7/15/12)             
5,835    Total U.S. Guaranteed            6,345,570 
    Utilities – 6.6%             
680    Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 1998A,    6/08 at 101.00    AAA    699,135 
     5.125%, 12/01/22 – FSA Insured             
1,000    Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 2003C,    9/13 at 100.00    AAA    1,044,490 
     5.000%, 9/01/16 – CIFG Insured             
    Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 2006A:             
570     5.000%, 12/01/23 – FGIC Insured    6/16 at 100.00    AAA    589,124 
430     5.000%, 12/01/25 – FGIC Insured    6/16 at 100.00    AAA    443,042 
500    New York State Energy Research and Development Authority, Pollution Control Revenue Bonds, New    3/08 at 101.50    AAA    494,815 
     York State Electric and Gas Corporation, Series 2005A, 4.100%, 3/15/15 – MBIA Insured             
250    Niagara County Industrial Development Agency, New York, Solid Waste Disposal Facility Revenue    11/11 at 101.00    Baa3    259,653 
     Bonds, American Ref-Fuel Company of Niagara LP, Series 2001A, 5.450%, 11/15/26 (Mandatory             
     put 11/15/12) (Alternative Minimum Tax)             
60    Westchester County Industrial Development Agency, Westchester County, New York, Resource    7/07 at 101.00    BBB    61,114 
     Recovery Revenue Bonds, RESCO Company, Series 1996, 5.500%, 7/01/09 (Alternative Minimum Tax)             
3,490    Total Utilities            3,591,373 
    Water and Sewer – 12.2%             
2,500    New York City Municipal Water Finance Authority, New York, Water and Sewerage System Revenue    6/11 at 101.00    AA+    2,548,096 
     Bonds, Fiscal Series 2001C, 5.125%, 6/15/33             
    New York State Environmental Facilities Corporation, State Clean Water and Drinking Water             
    Revolving Funds Revenue Bonds, New York City Municipal Water Finance Authority Loan,             
    Series 2002B:             
2,000     5.250%, 6/15/19    6/12 at 100.00    AAA    2,122,080 
2,000     5.000%, 6/15/27    6/12 at 100.00    AAA    2,040,720 
6,500    Total Water and Sewer            6,710,896 
$     52,165    Total Investments (cost $53,118,840) – 98.9%            54,242,085 
    Other Assets Less Liabilities – 1.1%            586,584 
    Net Assets – 100%           $   54,828,669 

(1)    Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or 
    redemption. There may be other call provisions at varying prices at later dates. Certain 
    mortgage-backed securities may be subject to periodic principal paydowns. 
(2)    Ratings: Using the higher of Standard & Poor's or Moody's rating. Ratings below BBB by Standard 
    & Poor's Group or Baa by Moody's Investor Service, Inc. are considered to be below investment grade. 
(3)    Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency 
    securities which ensure the timely payment of principal and interest. 
(ETM)    Escrowed to maturity. 

Income Tax Information

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to the treatment of paydown gains and losses, timing differences in recognizing taxable market discount and timing differences in recognizing certain gains and losses on investment transactions.

At June 30, 2006, the cost of investments was $53,113,872.

Gross unrealized appreciation and gross unrealized depreciation of investments at June 30, 2006, were as follows:

Gross unrealized:     
  Appreciation    $1,320,002 
  Depreciation    (191,789) 
Net unrealized appreciation (depreciation) of investments    $1,128,213 

Item 2. Controls and Procedures.

  1. The registrant's principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
  2. There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.

Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: EX-99 CERT Attached hereto.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)         Nuveen New York Select Tax-Free Income Portfolio        

By (Signature and Title)*          /s/ Jessica R. Droeger                     
                                                    Jessica R. Droeger
                                                    Vice President and Secretary

Date         August 28, 2006        

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title)*         /s/ Gifford R. Zimmerman                    
                                                   Gifford R. Zimmerman
                                                   Chief Administrative Officer (principal executive officer) 

Date         August 28, 2006        

By (Signature and Title)*         /s/ Stephen D. Foy                              
                                                   Stephen D. Foy
                                                   Vice President and Controller (principal financial officer) 

Date        August 28, 2006        

* Print the name and title of each signing officer under his or her signature.