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         811-05488         

        Nuveen Municipal Income Fund, Inc.         
(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:            10/31          

Date of reporting period:          1/31/06         

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 Municipal Income Fund, Inc. (NMI)
January 31, 2006

        Optional         
Principal        Call         
Amount (000)    Description    Provisions (1)    Ratings (2)    Value 
    Alabama – 0.8%             
$        690    Phenix City Industrial Development Board, Alabama, Environmental Improvement Revenue Bonds,    5/12 at 100.00    BBB  $  742,254 
     MeadWestvaco Corporation, Series 2002A, 6.350%, 5/15/35 (Alternative Minimum Tax)             
    California – 19.7%             
5,530    Adelanto School District, San Bernardino County, California, General Obligation Bonds, Series    No Opt. Call    AAA    2,669,608 
     1997A, 0.000%, 9/01/22 – MBIA Insured             
    Brea Olinda Unified School District, California, General Obligation Bonds, Series 1999A:             
2,000     0.000%, 8/01/21 – FGIC Insured    No Opt. Call    AAA    1,003,380 
2,070     0.000%, 8/01/22 – FGIC Insured    No Opt. Call    AAA    986,914 
2,120     0.000%, 8/01/23 – FGIC Insured    No Opt. Call    AAA    959,788 
3,000    California State Public Works Board, Lease Revenue Bonds, Department of Mental Health,    6/14 at 100.00    A–    3,108,360 
     Coalinga State Hospital, Series 2004A, 5.000%, 6/01/25             
1,000    California Statewide Community Development Authority, Revenue Bonds, Daughters of Charity    7/15 at 100.00    BBB+    1,004,660 
     Health System, Series 2005A, 5.000%, 7/01/39             
500    California, General Obligation Bonds, Series 2004, 5.200%, 4/01/26    4/14 at 100.00    A    534,345 
1,000    California, General Obligation Bonds, Series 2005, 5.000%, 3/01/27    3/16 at 100.00    A    1,044,010 
1,150    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series    1/07 at 100.00    AAA    1,179,613 
     1995A, 6.000%, 1/01/34 (Pre-refunded 1/01/07)             
3,000    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/13 at 100.00    BBB    3,378,510 
     Bonds, Series 2003A-1, 6.750%, 6/01/39             
500    Lake Elsinore Public Financing Authority, California, Local Agency Revenue Refunding Bonds,    10/13 at 102.00    N/R    541,970 
     Series 2003H, 6.375%, 10/01/33             
1,000    Vernon, California, Electric System Revenue Bonds, Malburg Generating Station Project, Series    4/08 at 100.00    Aaa    1,043,740 
     2003C, 5.375%, 4/01/18 (Pre-refunded 4/01/08)             
22,870    Total California            17,454,898 
    Colorado – 6.4%             
855    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds, Douglas    7/12 at 100.00    BBB    889,465 
     County School District RE-1 – DCS Montessori School, Series 2002A, 6.000%, 7/15/22             
480    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds,    8/11 at 100.00    AAA    565,507 
     Peak-to-Peak Charter School, Series 2001, 7.500%, 8/15/21 (Pre-refunded 8/15/11)             
1,000    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds, Weld    6/11 at 100.00    Ba1    1,034,690 
     County School District 6 – Frontier Academy, Series 2001, 7.375%, 6/01/31             
1,000    Colorado Health Facilities Authority, Revenue Bonds, Evangelical Lutheran Good Samaritan    6/16 at 100.00    A–    1,007,560 
     Society, Series 2005, 5.000%, 6/01/35             
2,000    Denver City and County, Colorado, Airport System Revenue Refunding Bonds, Series 2000A,    11/10 at 100.00    AAA    2,173,980 
     6.000%, 11/15/16 – AMBAC Insured (Alternative Minimum Tax)             
5,335    Total Colorado            5,671,202 
    Connecticut – 5.7%             
1,480    Capitol Region Education Council, Connecticut, Revenue Bonds, Series 1995, 6.750%, 10/15/15    4/06 at 102.00    BBB    1,512,190 
2,000    Connecticut Health and Educational Facilities Authority, Revenue Bonds, University of New    7/06 at 102.00    BBB– (3)    2,066,620 
     Haven, Series 1996D, 6.700%, 7/01/26 (Pre-refunded 7/01/06)             
500    Eastern Connecticut Resource Recovery Authority, Solid Waste Revenue Bonds, Wheelabrator    7/06 at 100.00    BBB    503,750 
     Lisbon Project, Series 1993A, 5.500%, 1/01/14 (Alternative Minimum Tax)             
950    Willimantic Housing Authority, Connecticut, GNMA Collateralized Multifamily Housing Mortgage    4/06 at 105.00    AAA    998,716 
     Revenue Bonds, Village Heights Apartments, Series 1995A, 8.000%, 10/20/30             
4,930    Total Connecticut            5,081,276 
    Florida – 2.3%             
175    Dade County Industrial Development Authority, Florida, Revenue Bonds, Miami Cerebral Palsy    6/06 at 101.50    N/R    177,952 
     Residential Services Inc., Series 1995, 8.000%, 6/01/22             
1,250    Martin County Industrial Development Authority, Florida, Industrial Development Revenue Bonds,    6/06 at 101.00    BB+    1,273,475 
     Indiantown Cogeneration LP, Series 1994A, 7.875%, 12/15/25 (Alternative Minimum Tax)             
600    Martin County Industrial Development Authority, Florida, Industrial Development Revenue    6/06 at 101.00    BB+    611,814 
     Refunding Bonds, Indiantown Cogeneration LP, Series 1995B, 8.050%, 12/15/25 (Alternative             
     Minimum Tax)             
2,025    Total Florida            2,063,241 
    Illinois – 10.0%             
1,400    Chicago, Illinois, Tax Increment Allocation Bonds, Irving/Cicero Redevelopment Project, Series    1/09 at 100.00    N/R    1,486,926 
     1998, 7.000%, 1/01/14             
    Illinois Development Finance Authority, Revenue Bonds, Chicago Charter School Foundation,             
    Series 2002A:             
500     6.125%, 12/01/22    12/12 at 100.00    BBB    529,660 
1,000     6.250%, 12/01/32    12/21 at 100.00    BBB    1,035,590 
1,000    Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational    5/12 at 101.00    Baa3    1,026,870 
     Advancement Foundation Fund, University Center Project, Series 2002, 6.250%, 5/01/34             
1,550    Illinois Health Facilities Authority, Revenue Bonds, Condell Medical Center, Series 2002,    5/12 at 100.00    Baa2    1,589,990 
     5.500%, 5/15/32             
1,735    Joliet Regional Port District, Illinois, Airport Facilities Revenue Bonds, Lewis University    7/07 at 103.00    N/R (3)    1,820,883 
     Airport, Series 1997A, 7.250%, 7/01/18 (Pre-refunded 7/01/07) (Alternative Minimum Tax)             
1,305    North Chicago, Illinois, General Obligation Bonds, Series 2005B, 5.000%, 11/01/25 – FGIC    11/15 at 100.00    AAA    1,374,387 
     Insured             
8,490    Total Illinois            8,864,306 
    Indiana – 4.0%             
2,000    Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Riverview Hospital,    8/12 at 101.00    Baa1    2,140,360 
     Series 2002, 6.125%, 8/01/31             
1,305    Whitley County, Indiana, Solid Waste and Sewerage Disposal Revenue Bonds, Steel Dynamics Inc.,    11/10 at 102.00    N/R    1,416,551 
     Series 1998, 7.250%, 11/01/18 (Alternative Minimum Tax)             
3,305    Total Indiana            3,556,911 
    Louisiana – 2.5%             
1,745    Louisiana Public Facilities Authority, Extended Care Facilities Revenue Bonds, Comm-Care    No Opt. Call    BBB    2,202,033 
     Corporation Project, Series 1994, 11.000%, 2/01/14             
    Maryland – 1.1%             
1,000    Maryland Energy Financing Administration, Revenue Bonds, AES Warrior Run Project, Series 1995,    9/07 at 100.00    N/R    1,013,960 
     7.400%, 9/01/19 (Alternative Minimum Tax)             
    Massachusetts – 0.9%             
500    Massachusetts Development Finance Agency, Resource Recovery Revenue Bonds, Ogden Haverhill    12/09 at 102.00    BBB    538,095 
     Associates, Series 1999A, 6.700%, 12/01/14 (Alternative Minimum Tax)             
270    Massachusetts Industrial Finance Agency, Resource Recovery Revenue Refunding Bonds, Ogden    12/08 at 102.00    BBB    275,489 
     Haverhill Project, Series 1998A, 5.450%, 12/01/12 (Alternative Minimum Tax)             
770    Total Massachusetts            813,584 
    Michigan – 3.7%             
1,000    Delta County Economic Development Corporation, Michigan, Environmental Improvement Revenue    4/12 at 100.00    AAA    1,126,080 
     Refunding Bonds, MeadWestvaco Corporation – Escanaba Paper Company, Series 2002B, 6.450%,             
     4/15/23 (Pre-refunded 4/15/12) (Alternative Minimum Tax)             
2,150    Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds, Sinai Hospital,    7/06 at 102.00    Ba3    2,168,060 
     Series 1995, 6.625%, 1/01/16             
3,150    Total Michigan            3,294,140 
    Montana – 1.4%             
1,200    Montana Board of Investments, Exempt Facility Revenue Bonds, Stillwater Mining Company, Series    7/10 at 101.00    B1    1,245,360 
     2000, 8.000%, 7/01/20 (Alternative Minimum Tax)             
    Nebraska – 1.2%             
1,000    Washington County, Nebraska, Wastewater Facilities Revenue Bonds, Cargill Inc., Series 2002,    11/12 at 101.00    A+    1,086,280 
     5.900%, 11/01/27 (Alternative Minimum Tax)             
    New Hampshire – 0.9%             
400    New Hampshire Higher Educational and Health Facilities Authority, Revenue Bonds, New Hampshire    1/07 at 102.00    BBB–    412,000 
     College, Series 1997, 6.375%, 1/01/27             
    New Hampshire Higher Educational and Health Facilities Authority, Revenue Bonds, New Hampshire             
    College, Series 1997:             
100     6.375%, 1/01/27 (Pre-refunded 1/01/07)    1/07 at 102.00    BBB– (3)    104,575 
200     6.375%, 1/01/27 (Pre-refunded 1/01/07)    1/07 at 102.00    BBB– (3)    209,430 
700    Total New Hampshire            726,005 
    New York – 6.2%             
1,000    Dormitory Authority of the State of New York, Revenue Bonds, Brooklyn Law School, Series    7/13 at 100.00    AA    1,092,060 
     2003A, 5.500%, 7/01/15 – RAAI Insured             
4,120    Yates County Industrial Development Agency, New York, FHA-Insured Civic Facility Mortgage    2/11 at 101.00    AA+    4,424,095 
     Revenue Bonds, Soldiers and Sailors Memorial Hospital, Series 2000A, 6.000%, 2/01/41             
5,120    Total New York            5,516,155 
    Ohio – 3.3%             
2,400    Ohio Water Development Authority, Solid Waste Disposal Revenue Bonds, Bay Shore Power, Series    9/09 at 102.00    N/R    2,487,912 
     1998B, 6.625%, 9/01/20 (Alternative Minimum Tax)             
400    Ohio Water Development Authority, Solid Waste Disposal Revenue Bonds, BHP Steel LLC, Series    3/06 at 102.00    A+    408,552 
     1995, 6.300%, 9/01/20 (Alternative Minimum Tax)             
2,800    Total Ohio            2,896,464 
    Pennsylvania – 2.9%             
1,080    Allegheny County Hospital Development Authority, Pennsylvania, Revenue Bonds, West Penn    11/10 at 102.00    Ba3    1,281,539 
     Allegheny Health System, Series 2000B, 9.250%, 11/15/30             
1,165    Carbon County Industrial Development Authority, Pennsylvania, Resource Recovery Revenue    No Opt. Call    BBB–    1,248,752 
     Refunding Bonds, Panther Creek Partners Project, Series 2000, 6.650%, 5/01/10 (Alternative             
     Minimum Tax)             
2,245    Total Pennsylvania            2,530,291 
    Rhode Island – 0.7%             
500    Rhode Island Tobacco Settlement Financing Corporation, Tobacco Settlement Asset-Backed Bonds,    6/12 at 100.00    BBB    528,395 
     Series 2002A, 6.250%, 6/01/42             
    South Carolina – 5.0%             
2,500    Greenville County School District, South Carolina, Installment Purchase Revenue Bonds, Series    12/12 at 101.00    AA–    2,740,100 
     2002, 5.500%, 12/01/13             
475    Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Series 1991, 6.750%,    No Opt. Call    AAA    604,366 
     1/01/19 (ETM) – FGIC Insured             
1,000    Tobacco Settlement Revenue Management Authority, South Carolina, Tobacco Settlement    5/11 at 101.00    BBB    1,054,130 
     Asset-Backed Bonds, Series 2001B, 6.000%, 5/15/22             
3,975    Total South Carolina            4,398,596 
    Tennessee – 2.5%             
1,000    Knox County Health, Educational and Housing Facilities Board, Tennessee, Hospital Revenue    4/12 at 101.00    Baa3    1,061,990 
     Bonds, Baptist Health System of East Tennessee Inc., Series 2002, 6.375%, 4/15/22             
    Shelby County Health, Educational and Housing Facilities Board, Tennessee, Hospital Revenue             
    Bonds, Methodist Healthcare, Series 2002:             
375     6.500%, 9/01/26 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    437,936 
625     6.500%, 9/01/26 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    729,894 
2,000    Total Tennessee            2,229,820 
    Texas – 7.5%             
2,000    Gulf Coast Waste Disposal Authority, Texas, Sewerage and Solid Waste Disposal Revenue Bonds,    4/12 at 100.00    A+    2,116,400 
     Anheuser Busch Company, Series 2002, 5.900%, 4/01/36 (Alternative Minimum Tax)             
2,000    Matagorda County Navigation District 1, Texas, Collateralized Revenue Refunding Bonds, Houston    10/13 at 101.00    AAA    1,984,500 
     Light and Power Company, Series 1995, 4.000%, 10/15/15 – MBIA Insured             
2,000    Weslaco Health Facilities Development Corporation, Texas, Hospital Revenue Bonds, Knapp    6/12 at 100.00    BBB+    2,152,660 
     Medical Center, Series 2002, 6.250%, 6/01/25             
1,000    West Texas Independent School District, McLennan and Hill Counties, General Obligation    8/13 at 51.84    AAA    360,290 
     Refunding Bonds, Series 1998, 0.000%, 8/15/25             
7,000    Total Texas            6,613,850 
    Virgin Islands – 3.1%             
2,545    Virgin Islands Public Finance Authority, Senior Lien Matching Fund Loan Note, Series 2004A,    10/14 at 100.00    BBB    2,730,607 
     5.250%, 10/01/19             
    Virginia – 3.1%             
1,000    Chesterfield County Industrial Development Authority, Virginia, Pollution Control Revenue    11/10 at 102.00    A3    1,090,090 
     Bonds, Virginia Electric and Power Company, Series 1987A, 5.875%, 6/01/17             
1,500    Mecklenburg County Industrial Development Authority, Virginia, Revenue Bonds, UAE Mecklenburg    10/12 at 100.00    A3    1,680,615 
     Cogeneration LP, Series 2002, 6.500%, 10/15/17 (Alternative Minimum Tax)             
2,500    Total Virginia            2,770,705 
    West Virginia – 2.4%             
2,050    Mason County, West Virginia, Pollution Control Revenue Bonds, Appalachian Power Company,    10/11 at 100.00    BBB    2,094,301 
     Series 2003L, 5.500%, 10/01/22             
    Wisconsin – 1.2%             
1,000    Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Carroll College Inc.,    10/11 at 100.00    BBB    1,066,270 
     Series 2001, 6.250%, 10/01/21             
$     88,945    Total Investments (cost $81,390,424) – 98.5%            87,190,904 
    Other Assets Less Liabilities – 1.5%            1,344,952 
    Net Assets – 100%            $88,535,856 

(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 Baa by Moody’s Investor 
    Service, Inc. or BBB by Standard & Poor’s Group are considered to be below investment grade. 
(3)    Securities are backed by an escrow or trust containing sufficient U.S. Government or U.S. Government 
    agency securities which ensures the timely payment of principal and interest. Such securities are normally 
    considered to be equivalent to AAA rated securities. 
N/R    Investment is not rated. 
(ETM)    Security is 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 timing differences in recognizing taxable market discount and timing differences in recognizing certain gains and losses on investment transactions. At January 31, 2006, the cost of investments was $81,327,360.

Gross unrealized appreciation and gross unrealized depreciation of investments at January 31, 2006, were as follows:
Gross unrealized:     
  Appreciation    $5,932,641 
  Depreciation    (69,097) 
Net unrealized appreciation (depreciation) of investments    $5,863,544 

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 Municipal Income Fund, Inc.        

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

Date         March 31, 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         March 31, 2006        

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

Date        March 31, 2006        

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