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         811-7056         

        Nuveen Select Maturities Municipal Fund         
(Exact name of registrant as specified in charter)

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


Kevin J. McCarthy—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:         6/30/07         

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 Select Maturities Municipal Fund (NIM)             
    June 30, 2007             
Principal        Optional Call         
Amount (000)    Description    Provisions (1)    Ratings (2)    Value 
    Alabama – 2.1%             
$          2,000    Alabama 21st Century Authority, Tobacco Settlement Revenue Bonds, Series 2001, 5.750%, 12/01/17    12/11 at 101.00    A–   $   2,102,040 
500    Marshall County Healthcare Authority, Alabama, Revenue Bonds, Series 2002A, 6.250%, 1/01/22    1/12 at 101.00    A–    535,615 
2,500    Total Alabama            2,637,655 
    Arizona – 1.2%             
445    Phoenix Industrial Development Authority, Arizona, Statewide Single Family Mortgage Revenue    4/08 at 101.50    AAA    456,232 
     Bonds, Series 1998C, 6.650%, 10/01/29 (Alternative Minimum Tax)             
750    Surprise Municipal Property Corporation, Arizona, Wastewater System Revenue Bonds, Series    4/11 at 100.00    BBB    735,330 
     2007, 4.500%, 4/01/17             
265    Winslow Industrial Development Authority, Arizona, Hospital Revenue Bonds, Winslow Memorial    No Opt. Call    N/R    266,071 
     Hospital, Series 1998, 5.750%, 6/01/08             
1,460    Total Arizona            1,457,633 
    Arkansas – 4.1%             
1,000    Fort Smith, Arkansas, Water and Sewer Revenue Refunding and Construction Bonds, Series 2002A,    10/11 at 100.00    AAA    1,048,800 
     5.250%, 10/01/17 – FSA Insured             
1,500    Jefferson County, Arkansas, Pollution Control Revenue Bonds, Entergy Arkansas Inc. Project,    6/11 at 100.00    A–    1,495,410 
     Series 2006, 4.600%, 10/01/17             
1,000    Jonesboro, Arkansas, Industrial Development Revenue Bonds, Anheuser Busch Inc. Project, Series    No Opt. Call    A    1,026,300 
     2002, 4.600%, 11/15/12             
1,380    North Little Rock, Arkansas, Electric Revenue Refunding Bonds, Series 1992A, 6.500%, 7/01/15 –    No Opt. Call    AAA    1,542,868 
     MBIA Insured             
4,880    Total Arkansas            5,113,378 
    California – 1.7%             
2,115    Vernon, California, Electric System Revenue Bonds, Malburg Generating Station Project, Series    4/08 at 100.00    Aaa    2,140,570 
     2003C, 5.250%, 4/01/17 (Pre-refunded 4/01/08)             
    Colorado – 13.3%             
2,895    Centennial Downs Metropolitan District, Colorado, General Obligation Bonds, Series 1999,    12/14 at 100.00    AAA    3,028,141 
     5.000%, 12/01/20 – AMBAC Insured             
1,175    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds,    12/13 at 100.00    AAA    1,185,798 
     Classical Academy, Series 2003, 4.500%, 12/01/18 – XLCA Insured             
1,320    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds, Douglas    7/12 at 100.00    BBB    1,370,728 
     County School District RE-1 – DCS Montessori School, Series 2002A, 6.000%, 7/15/22             
350    Colorado Housing Finance Authority, Single Family Program Senior Bonds, Series 2000D-2,    4/10 at 105.00    AA    362,250 
     6.900%, 4/01/29 (Alternative Minimum Tax)             
1,025    Denver Health and Hospitals Authority, Colorado, Healthcare Revenue Bonds, Series 2001A,    12/11 at 100.00    BBB (3)    1,105,360 
     6.000%, 12/01/23 (Pre-refunded 12/01/11)             
1,465    Denver West Metropolitan District, Colorado, General Obligation Refunding and Improvement    12/13 at 100.00    AA    1,454,100 
     Bonds, Series 2003, 4.500%, 12/01/18 – RAAI Insured             
1,340    Eagle Bend Metropolitan District 2, Colorado, General Obligation Bonds, Series 2004, 5.000%,    12/14 at 101.00    AA    1,382,223 
     12/01/20 – RAAI Insured             
70    El Paso County, Colorado, FNMA Mortgage-Backed Single Family Revenue Refunding Bonds, Series    No Opt. Call    Aaa    73,118 
     1992A-2, 8.750%, 6/01/11             
1,750    Erie, Boulder and Weld Counties, Colorado, Water Enterprise Revenue Bonds, Series 1998,    12/08 at 100.00    A    1,756,125 
     5.000%, 12/01/23 – ACA Insured             
70    Northwest Parkway Public Highway Authority, Colorado, Revenue Bonds, Senior Series 2001A,    6/11 at 102.00    AAA    72,977 
     5.250%, 6/15/41 – FSA Insured             
5,875    Northwest Parkway Public Highway Authority, Colorado, Senior Lien Revenue Bonds, Series 2001B,    6/11 at 38.04    AAA    1,863,668 
     0.000%, 6/15/27 – AMBAC Insured             
2,845    University of Colorado Hospital Authority, Revenue Bonds, Series 2001A, 5.600%, 11/15/21    11/11 at 100.00    Baa1 (3)    3,012,542 
     (Pre-refunded 11/15/11)             
20,180    Total Colorado            16,667,030 
    Connecticut – 1.7%             
    Eastern Connecticut Resource Recovery Authority, Solid Waste Revenue Bonds, Wheelabrator             
    Lisbon Project, Series 1993A:             
500     5.500%, 1/01/14 (Alternative Minimum Tax)    7/07 at 100.00    BBB    501,250 
1,570     5.500%, 1/01/15 (Alternative Minimum Tax)    9/07 at 100.00    BBB    1,573,925 
2,070    Total Connecticut            2,075,175 
    Florida – 4.6%             
2,400    Deltona, Florida, Utility Systems Water and Sewer Revenue Bonds, Series 2003, 5.250%, 10/01/17 –    10/13 at 100.00    AAA    2,553,504 
       MBIA Insured             
1,000    Florida Citizens Property Insurance Corporation, High Risk Account Revenue Bonds, Series    No Opt. Call    AAA    1,055,440 
     2007A, 5.000%, 3/01/15 – MBIA Insured             
2,000    Orange County, Florida, Tourist Development Tax Revenue Bonds, Series 2005, 5.000%, 10/01/22 –    10/15 at 100.00    AAA    2,085,700 
     AMBAC Insured             
5,400    Total Florida            5,694,644 
    Georgia – 0.4%             
465    Cherokee County Water and Sewerage Authority, Georgia, Revenue Bonds, Series 1995, 5.200%,    8/22 at 100.00    AAA    492,077 
     8/01/25 (Pre-refunded 8/01/22) – MBIA Insured             
    Illinois – 13.0%             
790    Chicago, Illinois, Tax Increment Allocation Bonds, Irving/Cicero Redevelopment Project, Series    1/09 at 100.00    N/R    815,936 
     1998, 7.000%, 1/01/14             
1,500    Cook County Township High School District 208, Illinois, General Obligation Bonds, Series    12/15 at 100.00    Aaa    1,567,545 
     2006, 5.000%, 12/01/21 – MBIA Insured             
2,000    Huntley, Illinois, Special Service Area 9, Special Tax Bonds, Series 2007, 5.100%, 3/01/28 –    3/17 at 100.00    AAA    2,037,020 
     AGC Insured             
4,890    Illinois Development Finance Authority, GNMA Collateralized Mortgage Revenue Bonds, Greek    4/11 at 105.00    Aaa    5,344,085 
     American Nursing Home Committee, Series 2000A, 7.600%, 4/20/40             
2,000    Illinois Development Finance Authority, Revenue Refunding Bonds, Olin Corporation, Series    4/10 at 102.00    BBB–    2,122,380 
     1993D, 6.750%, 3/01/16             
2,000    Illinois Educational Facilities Authority, Revenue Bonds, Art Institute of Chicago, Series    3/14 at 102.00    A1    1,993,840 
     2000, 4.450%, 3/01/34 (Mandatory put 3/01/15)             
1,000    Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational    5/12 at 101.00    Aaa    1,123,340 
     Advancement Foundation Fund, University Center Project, Series 2002, 6.625%, 5/01/17             
     (Pre-refunded 5/01/12)             
695    Illinois Health Facilities Authority, Revenue Bonds, Silver Cross Hospital and Medical    8/09 at 101.00    A    711,889 
     Centers, Series 1999, 5.500%, 8/15/19             
515    Illinois Health Facilities Authority, Revenue Bonds, Silver Cross Hospital and Medical    8/09 at 101.00    A (3)    536,228 
     Centers, Series 1999, 5.500%, 8/15/19 (Pre-refunded 8/15/09)             
15,390    Total Illinois            16,252,263 
    Iowa – 2.4%             
1,000    Iowa Finance Authority, Healthcare Revenue Bonds, Genesis Medical Center, Series 2000,    7/10 at 100.00    A1    1,052,410 
     6.250%, 7/01/25             
1,800    Iowa Tobacco Settlement Authority, Tobacco Settlement Asset-Backed Revenue Bonds, Series    6/11 at 101.00    AAA    1,882,494 
     2001B, 5.300%, 6/01/25 (Pre-refunded 6/01/11)             
2,800    Total Iowa            2,934,904 
    Kansas – 2.9%             
3,500    Wichita, Kansas, Hospital Facilities Revenue Refunding and Improvement Bonds, Via Christi    11/11 at 101.00    A+    3,648,365 
     Health System Inc., Series 2001-III, 5.500%, 11/15/21             
    Kentucky – 1.5%             
1,830    Kentucky Housing Corporation, Housing Revenue Bonds, Series 2005G, 5.000%, 7/01/30    1/15 at 100.60    AAA    1,872,511 
     (Alternative Minimum Tax)             
    Maryland – 0.9%             
1,100    Maryland Energy Financing Administration, Revenue Bonds, AES Warrior Run Project, Series 1995,    9/07 at 100.00    N/R    1,106,336 
     7.400%, 9/01/19 (Alternative Minimum Tax)             
    Massachusetts – 1.9%             
500    Massachusetts Development Finance Agency, Revenue Bonds, Orchard Cove, Series 2007,    10/17 at 100.00    BBB–    498,375 
     5.000%, 10/01/19             
1,465    Massachusetts Housing Finance Agency, Rental Housing Mortgage Revenue Bonds, Series 2000H,    7/10 at 100.00    AAA    1,541,693 
     6.650%, 7/01/41 – MBIA Insured (Alternative Minimum Tax)             
    Massachusetts Port Authority, Special Facilities Revenue Bonds, Delta Air Lines Inc.,             
    Series 2001A:             
100     5.200%, 1/01/20 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    AAA    102,887 
235     5.000%, 1/01/27 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    AAA    238,069 
2,300    Total Massachusetts            2,381,024 
    Michigan – 1.7%             
1,000    Cornell Township Economic Development Corporation, Michigan, Environmental Improvement Revenue    5/12 at 100.00    AAA    1,082,370 
     Refunding Bonds, MeadWestvaco Corporation-Escanaba Project, Series 2002, 5.875%, 5/01/18             
     (Pre-refunded 5/01/12)             
600    Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds, Sinai Hospital,    7/07 at 101.00    Ba3    604,026 
     Series 1995, 6.625%, 1/01/16             
470    Michigan State Hospital Finance Authority, Revenue Refunding Bonds, Detroit Medical Center,    9/07 at 100.00    BB–    470,790 
     Series 1988A, 8.125%, 8/15/12             
2,070    Total Michigan            2,157,186 
    Minnesota – 0.8%             
1,000    White Earth Band of Chippewa Indians, Minnesota, Revenue Bonds, Series 2000A, 7.000%, 12/01/11 –    No Opt. Call    A    1,055,190 
     ACA Insured             
    Nebraska – 0.8%             
1,000    Dodge County School District 1, Nebraska, Fremont Public Schools, General Obligation Bonds,    12/14 at 100.00    Aaa    1,047,510 
     Series 2004, 5.000%, 12/15/19 – FSA Insured             
    New Jersey – 0.4%             
500    Bayonne Redevelopment Agency, New Jersey, Revenue Bonds, Royal Caribbean Cruises Project,    No Opt. Call    BBB–    494,810 
     Series 2006A, 4.750%, 11/01/16 (Alternative Minimum Tax)             
    New York – 8.0%             
1,000    Dormitory Authority of the State of New York, Revenue Bonds, Brooklyn Law School, Series    7/13 at 100.00    AA    1,065,910 
     2003A, 5.500%, 7/01/15 – RAAI Insured             
1,500    New York State Energy Research and Development Authority, Facilities Revenue Bonds,    9/07 at 100.00    A1    1,500,270 
     Consolidated Edison Company Inc., Series 2001A, 4.700%, 6/01/36 (Mandatory put 10/01/12)             
     (Alternative Minimum Tax)             
420    New York State Medical Care Facilities Finance Agency, FHA-Insured Mortgage Hospital and    8/07 at 101.00    AA+    424,859 
     Nursing Home Revenue Bonds, Series 1995C, 6.100%, 8/15/15             
2,130    Niagara Falls, Niagara County, New York, General Obligation Water Treatment Plant Bonds,    No Opt. Call    AAA    2,162,546 
     Series 1994, 8.500%, 11/01/07 – MBIA Insured (Alternative Minimum Tax) (ETM)             
4,300    Port Authority of New York and New Jersey, Special Project Bonds, JFK International Air    No Opt. Call    AAA    4,876,458 
     Terminal LLC, Sixth Series 1997, 7.000%, 12/01/12 – MBIA Insured (Alternative Minimum Tax)             
9,350    Total New York            10,030,043 
    North Carolina – 1.6%             
1,880    Union County, North Carolina, Certificates of Participation, Series 2003, 5.000%, 6/01/18 –    6/13 at 101.00    AAA    1,969,244 
     AMBAC Insured             
    Ohio – 0.8%             
1,000    Toledo-Lucas County Port Authority, Ohio, Port Revenue Bonds, Cargill Inc., Series 2004B,    No Opt. Call    A    1,011,300 
     4.500%, 12/01/15             
    Oklahoma – 0.9%             
1,150    Oklahoma State Industries Authority, Health System Revenue Refunding Bonds, Baptist Medical    8/07 at 101.00    AAA    1,162,374 
     Center, Series 1995D, 5.000%, 8/15/14 – AMBAC Insured             
    Pennsylvania – 7.9%             
1,120    Pennsylvania Higher Educational Facilities Authority, College Revenue Bonds, Ninth Series    No Opt. Call    Aaa    1,249,886 
     1976, 7.625%, 7/01/15 (ETM)             
4,120    Philadelphia Gas Works, Pennsylvania, Revenue Bonds, Eighteenth Series 2004, 5.000%, 8/01/15 –    8/14 at 100.00    AAA    4,320,891 
     AMBAC Insured             
925    Philadelphia Gas Works, Pennsylvania, Revenue Bonds, Twelfth Series 1990B, 7.000%, 5/15/20 –    No Opt. Call    AAA    1,084,091 
     MBIA Insured (ETM)             
2,085    Pittsburgh School District, Allegheny County, Pennsylvania, General Obligation Bonds, Series    No Opt. Call    AAA    2,181,640 
     2006B, 5.000%, 9/01/12 – AMBAC Insured             
1,000    Pittsburgh, Pennsylvania, General Obligation Bonds, Series 2005A, 5.000%, 9/01/11 –    No Opt. Call    AAA    1,040,170 
     MBIA Insured             
9,250    Total Pennsylvania            9,876,678 
    South Carolina – 6.4%             
750    Berkeley County School District, South Carolina, Installment Purchase Revenue Bonds, Securing    12/13 at 100.00    A–    781,470 
     Assets for Education, Series 2003, 5.250%, 12/01/19             
1,540    Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Series 1991, 6.750%,    No Opt. Call    AAA    1,886,700 
     1/01/19 – FGIC Insured (ETM)             
2,835    Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Series 1991, 6.750%,    No Opt. Call    AAA    3,418,613 
     1/01/19 – FGIC Insured             
25    South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon    11/12 at 100.00    A–    25,960 
     Secours Health System Inc., Series 2002A, 5.625%, 11/15/30             
1,260    South Carolina JOBS Economic Development Authority, Hospital Revenue Bonds, Palmetto Health    No Opt. Call    Baa2 (3)    1,338,775 
     Alliance, Series 2000A, 7.000%, 12/15/10 (ETM)             
500    Tobacco Settlement Revenue Management Authority, South Carolina, Tobacco Settlement    5/11 at 101.00    BBB    529,860 
     Asset-Backed Bonds, Series 2001B, 6.000%, 5/15/22             
6,910    Total South Carolina            7,981,378 
    South Dakota – 0.8%             
1,000    South Dakota Health and Educational Facilities Authority, Revenue Bonds, Sanford Health,    5/17 at 100.00    AA–    1,019,010 
     Series 2007, 5.000%, 11/01/27             
    Tennessee – 1.8%             
    Shelby County Health, Educational and Housing Facilities Board, Tennessee, Hospital Revenue             
    Bonds, Methodist Healthcare, Series 2002:             
750     6.000%, 9/01/17 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    819,960 
1,250     6.000%, 9/01/17 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    1,366,600 
2,000    Total Tennessee            2,186,560 
    Texas – 6.1%             
1,055    Austin, Texas, General Obligation Bonds, Series 2004, 5.000%, 9/01/20 – MBIA Insured    9/14 at 100.00    AAA    1,098,783 
25    Brazos River Authority, Texas, Collateralized Pollution Control Revenue Bonds, Texas Utilities    No Opt. Call    Baa2    25,463 
     Electric Company, Series 2003D, 5.400%, 10/01/29 (Mandatory put 10/01/14)             
2,000    Brazos River Authority, Texas, Collateralized Revenue Refunding Bonds, CenterPoint Energy    6/14 at 100.00    AAA    1,981,180 
     Inc., Series 2004B, 4.250%, 12/01/17 – FGIC Insured             
500    Brazos River Authority, Texas, Pollution Control Revenue Refunding Bonds, TXU Electric    No Opt. Call    Baa2    509,100 
     Company, Series 2001C, 5.750%, 5/01/36 (Mandatory put 11/01/11) (Alternative Minimum Tax)             
15    Brazos River Authority, Texas, Pollution Control Revenue Refunding Bonds, TXU Energy Company    No Opt. Call    Baa2    16,123 
     LLC, Series 2003A, 6.750%, 4/01/38 (Mandatory put 4/01/13) (Alternative Minimum Tax)             
1,875    Denton Independent School District, Denton County, Texas, General Obligation Bonds, Series    8/16 at 100.00    AAA    1,960,875 
     2006, 5.000%, 8/15/20             
90    Galveston Property Finance Authority Inc., Texas, Single Family Mortgage Revenue Bonds, Series    9/07 at 100.00    Caa1    88,107 
     1991A, 8.500%, 9/01/11             
25    Sabine River Authority, Texas, Pollution Control Revenue Bonds, TXU Energy Company LLC    No Opt. Call    Baa2    25,455 
     Project, Series 2001B, 5.750%, 5/01/30 (Mandatory put 11/01/11) (Alternative Minimum Tax)             
1,500    Texas Municipal Gas Acquistion and Supply Corporation I, Gas Supply Revenue Bonds, Series    9/07 at 100.00    AA-    1,497,000 
     2006B, 4.148%, 12/15/17             
100    Travis County Health Facilities Development Corporation, Texas, Hospital Revenue Bonds,    9/07 at 100.00    Aaa    100,170 
     Daughters of Charity National Health System, Series 1993B, 5.900%, 11/15/07 (ETM)             
370    Tri-County Mental Health and Retardation Center, Texas, Revenue Bonds, Facilities Acquisition    9/07 at 100.00    AAA    371,450 
     Program, Series 1995E, 6.500%, 3/01/15 – FSA Insured             
7,555    Total Texas            7,673,706 
    Utah – 1.2%             
1,500    Bountiful, Davis County, Utah, Hospital Revenue Refunding Bonds, South Davis Community    No Opt. Call    N/R    1,530,585 
     Hospital Project, Series 1998, 6.000%, 12/15/10             
    Washington – 4.0%             
    Washington Public Power Supply System, Revenue Refunding Bonds, Nuclear Project 1,             
    Series 1993A:             
1,340     7.000%, 7/01/07 (ETM)    No Opt. Call    Aaa    1,340,228 
160     7.000%, 7/01/07 (ETM)    No Opt. Call    Aaa    160,027 
1,130     7.000%, 7/01/08 (ETM)    No Opt. Call    Aaa    1,166,081 
1,870    Washington Public Power Supply System, Revenue Refunding Bonds, Nuclear Project 1, Series    No Opt. Call    AAA    1,927,839 
     1993A, 7.000%, 7/01/08             
295    Washington Public Power Supply System, Revenue Refunding Bonds, Nuclear Project 3, Series    No Opt. Call    AAA    359,024 
     1989B, 7.125%, 7/01/16 – MBIA Insured             
4,795    Total Washington            4,953,199 
    West Virginia – 1.6%             
2,000    Harrison County Commission, West Virginia, Solid Waste Disposal Revenue Bonds, West Penn Power    9/07 at 100.00    AAA    2,030,000 
     Company, Series 1994C, 6.750%, 8/01/24 – MBIA Insured (Alternative Minimum Tax)             
    Wisconsin – 3.7%             
    Badger Tobacco Asset Securitization Corporation, Wisconsin, Tobacco Settlement Asset-Backed             
    Bonds, Series 2002:             
795     6.125%, 6/01/27    6/12 at 100.00    BBB    838,701 
1,480     6.375%, 6/01/32    6/12 at 100.00    BBB    1,602,263 
1,000    Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Agnesian Healthcare    7/11 at 100.00    A–    1,047,700 
     Inc., Series 2001, 6.000%, 7/01/21             
1,150    Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Aurora Health Care Inc.,    2/09 at 101.00    A    1,172,138 
     Series 1999A, 5.500%, 2/15/20 – ACA Insured             
4,425    Total Wisconsin            4,660,802 
$      123,375    Total Investments (cost $123,165,547) – 100.2%            125,313,140 
    Other Assets Less Liabilities – (0.2)%            (197,348) 
    Net Assets – 100%           $   125,115,792 

    The Fund may invest in “zero coupon” securities. A zero coupon security does not pay a regular interest 
    coupon to its holders during the life of the security. Tax-exempt income to the holder of the security comes 
    from accretion of the difference between the original purchase price of the security at issuance and the par 
    value of the security at maturity and is effectively paid at maturity. Such securities are included in the 
    portfolio with a 0.00% coupon rate in their description. The market prices of zero coupon securities 
    generally are more volatile than the market prices of securities that pay interest periodically. 
(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. Such investments are normally considered to 
    be equivalent to AAA rated securities. 
N/R    Not rated. 
(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, 2007, the cost of investments was $123,112,554.

Gross unrealized appreciation and gross unrealized depreciation of investments at June 30, 2007, were as follows:

Gross unrealized:     
  Appreciation    $2,752,232 
  Depreciation    (551,646) 
Net unrealized appreciation (depreciation) of investments    $2,200,586 

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 Select Maturities Municipal Fund        

By (Signature and Title)*          /s/ Kevin J. McCarthy                    
                                                    Kevin J. McCarthy
                                                    Vice President and Secretary

Date         August 29, 2007        

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 29, 2007        

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

Date        August 29, 2007        

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