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)


        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:            03/31          

Date of reporting period:         12/31/06         

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 Select Maturities Municipal Fund (NIM)             
    December 31, 2006             
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–   $   2,133,020 
500    Marshall County Healthcare Authority, Alabama, Revenue Bonds, Series 2002A, 6.250%, 1/01/22    1/12 at 101.00    A–    547,295 
2,500    Total Alabama            2,680,315 
    Arizona – 0.9%             
565    Phoenix Industrial Development Authority, Arizona, Statewide Single Family Mortgage Revenue    4/08 at 101.50    AAA    580,526 
     Bonds, Series 1998C, 6.650%, 10/01/29 (Alternative Minimum Tax)             
515    Winslow Industrial Development Authority, Arizona, Hospital Revenue Bonds, Winslow Memorial    No Opt. Call    N/R    518,950 
     Hospital, Series 1998, 5.750%, 6/01/08             
1,080    Total Arizona            1,099,476 
    Arkansas – 4.1%             
1,000    Fort Smith, Arkansas, Water and Sewer Revenue Refunding and Construction Bonds, Series 2002A,    10/11 at 100.00    AAA    1,063,150 
     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–    1,522,470 
     Series 2006, 4.600%, 10/01/17             
1,000    Jonesboro, Arkansas, Industrial Development Revenue Bonds, Anheuser Busch Inc. Project, Series    No Opt. Call    A1    1,042,710 
     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    1,579,134 
     MBIA Insured             
4,880    Total Arkansas            5,207,464 
    California – 1.7%             
2,115    Vernon, California, Electric System Revenue Bonds, Malburg Generating Station Project, Series    4/08 at 100.00    Aaa    2,161,657 
     2003C, 5.250%, 4/01/17 (Pre-refunded 4/01/08)             
    Colorado – 13.4%             
2,895    Centennial Downs Metropolitan District, Colorado, General Obligation Bonds, Series 1999,    12/14 at 100.00    AAA    3,096,926 
     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    1,204,963 
     Classical Academy, Series 2003, 4.500%, 12/01/18 – XLCA Insured             
1,350    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds, Douglas    7/12 at 100.00    BBB    1,416,299 
     County School District RE-1 – DCS Montessori School, Series 2002A, 6.000%, 7/15/22             
405    Colorado Housing Finance Authority, Single Family Program Senior Bonds, Series 2000D-2,    4/10 at 105.00    AA    407,511 
     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    1,099,405 
     6.000%, 12/01/23             
1,465    Denver West Metropolitan District, Colorado, General Obligation Refunding and Improvement    12/13 at 100.00    AA    1,485,495 
     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    1,417,506 
     12/01/20 – RAAI Insured             
85    El Paso County, Colorado, FNMA Mortgage-Backed Single Family Revenue Refunding Bonds, Series    No Opt. Call    Aaa    88,129 
     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    1,770,370 
     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    74,628 
     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    1,841,401 
     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    3,006,169 
20,280    Total Colorado            16,908,802 
    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)    1/07 at 100.00    BBB    505,000 
1,570     5.500%, 1/01/15 (Alternative Minimum Tax)    1/15 at 100.00    BBB    1,586,564 
2,070    Total Connecticut            2,091,564 
    District of Columbia – 0.5%             
685    District of Columbia, General Obligation Refunding Bonds, Series 1993A, 6.000%, 6/01/07 – MBIA    No Opt. Call    AAA    691,117 
     Insured             
85    District of Columbia, General Obligation Refunding Bonds, Series 1993A, 6.000%, 6/01/07 – MBIA    No Opt. Call    AAA    85,850 
     Insured (ETM)             
770    Total District of Columbia            776,967 
    Florida – 3.8%             
2,400    Deltona, Florida, Utility Systems Water and Sewer Revenue Bonds, Series 2003, 5.250%,    10/13 at 100.00    AAA    2,603,256 
     10/01/17 – MBIA Insured             
2,000    Orange County, Florida, Tourist Development Tax Revenue Bonds, Series 2005, 5.000%,    10/15 at 100.00    AAA    2,141,040 
     10/01/22 – AMBAC Insured             
4,400    Total Florida            4,744,296 
    Illinois – 12.1%             
845    Chicago, Illinois, Tax Increment Allocation Bonds, Irving/Cicero Redevelopment Project, Series    1/09 at 100.00    N/R    883,676 
     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    1,608,675 
     2006, 5.000%, 12/01/21 – MBIA Insured             
4,905    Illinois Development Finance Authority, GNMA Collateralized Mortgage Revenue Bonds, Greek    4/11 at 105.00    Aaa    4,938,599 
     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–    2,140,560 
     1993D, 6.750%, 3/01/16             
2,000    Illinois Educational Facilities Authority, Revenue Bonds, Art Institute of Chicago, Series    3/34 at 100.00    A1    2,037,380 
     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    1,150,790 
     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    720,201 
     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)    543,922 
     Centers, Series 1999, 5.500%, 8/15/19 (Pre-refunded 8/15/09)             
1,000    Illinois Health Facilities Authority, Revenue Refunding Bonds, Edward Hospital, Series 1993A,    2/19 at 100.00    A+    1,014,790 
     6.000%, 2/15/19             
300    Illinois Housing Development Authority, Section 8 Elderly Housing Revenue Bonds, Skyline    5/07 at 100.00    A    300,282 
     Towers Apartments, Series 1992B, 6.625%, 11/01/07             
14,760    Total Illinois            15,338,875 
    Indiana – 0.7%             
1,000    Indianapolis Local Public Improvement Bond Bank, Indiana, Series 1992D, 6.600%, 2/01/07    No Opt. Call    AA    1,002,540 
    Iowa – 2.4%             
1,000    Iowa Finance Authority, Healthcare Revenue Bonds, Genesis Medical Center, Series 2000, 6.250%,    7/10 at 100.00    A1    1,067,020 
     7/01/25             
1,800    Iowa Tobacco Settlement Authority, Tobacco Settlement Asset-Backed Revenue Bonds, Series    6/11 at 101.00    AAA    1,916,946 
     2001B, 5.300%, 6/01/25 (Pre-refunded 6/01/11)             
2,800    Total Iowa            2,983,966 
    Kansas – 2.9%             
3,500    Wichita, Kansas, Hospital Facilities Revenue Refunding and Improvement Bonds, Via Christi    11/11 at 101.00    A+    3,699,430 
     Health System Inc., Series 2001-III, 5.500%, 11/15/21             
    Kentucky – 1.6%             
1,925    Kentucky Housing Corporation, Housing Revenue Bonds, Series 2005G, 5.000%, 7/01/30    1/15 at 100.60    AAA    1,984,117 
     (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    1,107,095 
     7.400%, 9/01/19 (Alternative Minimum Tax)             
    Massachusetts – 1.2%             
1,470    Massachusetts Housing Finance Agency, Rental Housing Mortgage Revenue Bonds, Series 2000H,    7/10 at 100.00    AAA    1,569,872 
     6.650%, 7/01/41 – MBIA Insured (Alternative Minimum Tax)             
    Michigan – 1.9%             
1,000    Cornell Township Economic Development Corporation, Michigan, Environmental Improvement Revenue    5/12 at 100.00    AAA    1,107,250 
     Refunding Bonds, MeadWestvaco Corporation–Escanaba Project, Series 2002, 5.875%, 5/01/18             
     (Pre-refunded 5/01/12)             
204    Michigan State Hospital Finance Authority, Collateralized Loan, Detroit Medical Center, Series    No Opt. Call    N/R    203,732 
     2001, 7.360%, 3/01/07             
600    Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds, Sinai Hospital,    1/07 at 101.00    Ba3    606,636 
     Series 1995, 6.625%, 1/01/16             
470    Michigan State Hospital Finance Authority, Revenue Refunding Bonds, Detroit Medical Center,    8/12 at 100.00    BB–    470,832 
     Series 1988A, 8.125%, 8/15/12             
2,274    Total Michigan            2,388,450 
    Minnesota – 0.8%             
1,000    White Earth Band of Chippewa Indians, Minnesota, Revenue Bonds, Series 2000A, 7.000%,    No Opt. Call    A    1,072,800 
     12/01/11 – 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    1,067,940 
     Series 2004, 5.000%, 12/15/19 – FSA Insured             
    New York – 8.3%             
1,000    Dormitory Authority of the State of New York, Revenue Bonds, Brooklyn Law School, Series    7/13 at 100.00    AA    1,089,060 
     2003A, 5.500%, 7/01/15 – RAAI Insured             
1,500    New York State Energy Research and Development Authority, Facilities Revenue Bonds,    6/36 at 100.00    A1    1,500,645 
     Consolidated Edison Company Inc., Series 2001A, 4.700%, 6/01/36 (Mandatory put 10/01/12)             
     (Alternative Minimum Tax)             
645    New York State Medical Care Facilities Finance Agency, FHA-Insured Mortgage Hospital and    2/07 at 101.00    AA+    658,971 
     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    2,213,198 
     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    4,989,287 
     Terminal LLC, Sixth Series 1997, 7.000%, 12/01/12 – MBIA Insured (Alternative Minimum Tax)             
9,575    Total New York            10,451,161 
    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    2,017,202 
     AMBAC Insured             
    Ohio – 0.8%             
1,000    Toledo-Lucas County Port Authority, Ohio, Port Revenue Bonds, Cargill Inc., Series 2004B,    No Opt. Call    A+    1,026,370 
     4.500%, 12/01/15             
    Oklahoma – 0.9%             
1,150    Oklahoma State Industries Authority, Health System Revenue Refunding Bonds, Baptist Medical    2/07 at 102.00    AAA    1,170,804 
     Center, Series 1995D, 5.000%, 8/15/14 – AMBAC Insured             
    Pennsylvania – 7.4%             
1,205    Pennsylvania Higher Educational Facilities Authority, College Revenue Bonds, Ninth Series    No Opt. Call    Aaa    1,378,592 
     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    4,421,543 
     AMBAC Insured             
175    Philadelphia Gas Works, Pennsylvania, Revenue Bonds, Twelfth Series 1990B, 7.000%, 5/15/20 –    No Opt. Call    AAA    209,515 
     MBIA Insured (ETM)             
2,085    Pittsburgh School District, Allegheny County, Pennsylvania, General Obligation Bonds, Series    No Opt. Call    AAA    2,222,985 
     2006B, 5.000%, 9/01/12 – AMBAC Insured             
1,000    Pittsburgh, Pennsylvania, General Obligation Bonds, Series 2005A, 5.000%, 9/01/11 – MBIA    No Opt. Call    AAA    1,056,360 
     Insured             
8,585    Total Pennsylvania            9,288,995 
    South Carolina – 6.5%             
750    Berkeley County School District, South Carolina, Installment Purchase Revenue Bonds, Securing    12/13 at 100.00    A–    791,093 
     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    1,955,015 
     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    3,549,392 
     1/01/19 – FGIC Insured             
1,260    South Carolina JOBS Economic Development Authority, Hospital Revenue Bonds, Palmetto Health    No Opt. Call    Baa2 (3)    1,362,325 
     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    533,855 
     Asset-Backed Bonds, Series 2001B, 6.000%, 5/15/22             
6,885    Total South Carolina            8,191,680 
    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)    839,730 
1,250     6.000%, 9/01/17 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    1,399,550 
2,000    Total Tennessee            2,239,280 
    Texas – 5.8%             
1,055    Austin, Texas, General Obligation Bonds, Series 2004, 5.000%, 9/01/20 – MBIA Insured    9/14 at 100.00    AAA    1,120,832 
2,000    Brazos River Authority, Texas, Collateralized Revenue Refunding Bonds, CenterPoint Energy    6/14 at 100.00    AAA    2,018,600 
     Inc., Series 2004B, 4.250%, 12/01/17 – FGIC Insured             
1,875    Denton Independent School District, Denton County, Texas, General Obligation Bonds, Series    8/16 at 100.00    AAA    2,016,544 
     2006, 5.000%, 8/15/20             
115    Galveston Property Finance Authority Inc., Texas, Single Family Mortgage Revenue Bonds, Series    3/07 at 100.00    A3    117,130 
     1991A, 8.500%, 9/01/11             
1,500    Texas Municipal Gas Acquistion and Supply Corporation I, Gas Supply Revenue Bonds, Series    1/07 at 100.00    AA–    1,497,750 
     2006B, 4.148%, 12/15/17             
100    Travis County Health Facilities Development Corporation, Texas, Hospital Revenue Bonds,    5/07 at 100.00    Aaa    100,185 
     Daughters of Charity National Health System, Series 1993B, 5.900%, 11/15/07 (ETM)             
415    Tri-County Mental Health and Retardation Center, Texas, Revenue Bonds, Facilities Acquisition    3/07 at 100.00    AAA    416,722 
     Program, Series 1995E, 6.500%, 3/01/15 – FSA Insured             
7,060    Total Texas            7,287,763 
    Utah – 1.4%             
1,690    Bountiful, Davis County, Utah, Hospital Revenue Refunding Bonds, South Davis Community    No Opt. Call    N/R    1,735,664 
     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    1,362,659 
1,130     7.000%, 7/01/08 (ETM)    No Opt. Call    Aaa    1,186,579 
    Washington Public Power Supply System, Revenue Refunding Bonds, Nuclear Project 1,             
    Series 1993A:             
160     7.000%, 7/01/07    No Opt. Call    Aaa    162,664 
1,870     7.000%, 7/01/08    No Opt. Call    AAA    1,959,704 
295    Washington Public Power Supply System, Revenue Refunding Bonds, Nuclear Project 3,    No Opt. Call    AAA    370,629 
     Series 1989B, 7.125%, 7/01/16 – MBIA Insured             
4,795    Total Washington            5,042,235 
    West Virginia – 1.6%             
2,000    Harrison County Commission, West Virginia, Solid Waste Disposal Revenue Bonds, West Penn Power    8/24 at 100.00    AAA    2,018,400 
     Company, Series 1994C, 6.750%, 8/01/24 – MBIA Insured (Alternative Minimum Tax)             
    Wisconsin – 3.8%             
    Badger Tobacco Asset Securitization Corporation, Wisconsin, Tobacco Settlement Asset-Backed             
    Bonds, Series 2002:             
840     6.125%, 6/01/27    6/12 at 100.00    BBB    907,511 
1,480     6.375%, 6/01/32    6/12 at 100.00    BBB    1,615,109 
1,000    Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Agnesian Healthcare    7/11 at 100.00    A–    1,065,380 
     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    1,185,133 
     Series 1999A, 5.500%, 2/15/20 – ACA Insured             
4,470    Total Wisconsin            4,773,133 
$      120,014    Total Investments (cost $119,742,519) – 97.4%            123,128,313 
    Other Assets Less Liabilities – 2.6%            3,229,317 
    Net Assets – 100%           $   126,357,630 

(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 December 31, 2006, the cost of investments was $119,696,377.

Gross unrealized appreciation and gross unrealized depreciation of investments at December 31, 2006, were as follows:

Gross unrealized:     
  Appreciation    $3,910,192 
  Depreciation    (478,256) 
Net unrealized appreciation (depreciation) of investments    $3,431,936 

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/ Jessica R. Droeger                     
                                                    Jessica R. Droeger
                                                    Vice President and Secretary

Date         March 1, 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         March 1, 2007        

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

Date        March 1, 2007        

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