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:         7/31/06         

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)             
                           July 31, 2006             
Principal        Optional Call         
Amount (000)    Description    Provisions (1)    Ratings (2)    Value 
    Alabama – 0.9%             
$             690    Phenix City Industrial Development Board, Alabama, Environmental Improvement Revenue Bonds,    5/12 at 100.00    BBB   $   738,652 
     MeadWestvaco Corporation, Series 2002A, 6.350%, 5/15/35 (Alternative Minimum Tax)             
    California – 20.9%             
5,530    Adelanto School District, San Bernardino County, California, General Obligation Bonds, Series    No Opt. Call    AAA    2,720,318 
     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    994,860 
2,070     0.000%, 8/01/22 – FGIC Insured    No Opt. Call    AAA    979,772 
2,120     0.000%, 8/01/23 – FGIC Insured    No Opt. Call    AAA    952,834 
1,000    California Health Facilities Financing Authority, Revenue Bonds, Kaiser Permanante System,    4/16 at 100.00    A+    1,032,610 
     Series 2006, 5.250%, 4/01/39             
3,000    California State Public Works Board, Lease Revenue Bonds, Department of Mental Health,    6/14 at 100.00    A    3,075,030 
     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+    1,001,380 
     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+    523,475 
1,000    California, General Obligation Bonds, Series 2005, 5.000%, 3/01/27    3/16 at 100.00    A+    1,031,070 
1,150    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series    1/07 at 100.00    AAA    1,161,362 
     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    3,377,100 
     Bonds, Series 2003A-1, 6.750%, 6/01/39             
500    Lake Elsinore Public Finance Authority, California, Local Agency Revenue Refunding Bonds,    10/13 at 102.00    N/R    540,870 
     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    1,028,490 
     2003C, 5.375%, 4/01/18 (Pre-refunded 4/01/08)             
23,870    Total California            18,419,171 
    Colorado – 6.4%             
840    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds, Douglas    7/12 at 100.00    BBB    871,626 
     County School District RE-1 – DCS Montessori School, Series 2002A, 6.000%, 7/15/22             
460    Colorado Educational and Cultural Facilities Authority, Charter School Revenue Bonds,    8/11 at 100.00    AAA    529,097 
     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    1,063,940 
     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–    1,002,630 
     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    2,151,580 
     6.000%, 11/15/16 – AMBAC Insured (Alternative Minimum Tax)             
5,300    Total Colorado            5,618,873 
    Connecticut – 2.3%             
1,480    Capitol Region Education Council, Connecticut, Revenue Bonds, Series 1995, 6.750%, 10/15/15    10/06 at 101.00    BBB    1,512,072 
500    Eastern Connecticut Resource Recovery Authority, Solid Waste Revenue Bonds, Wheelabrator    1/07 at 100.00    BBB    502,050 
     Lisbon Project, Series 1993A, 5.500%, 1/01/14 (Alternative Minimum Tax)             
1,980    Total Connecticut            2,014,122 
    Florida – 2.3%             
170    Dade County Industrial Development Authority, Florida, Revenue Bonds, Miami Cerebral Palsy    12/06 at 101.50    N/R    172,868 
     Residential Services Inc., Series 1995, 8.000%, 6/01/22             
1,250    Martin County Industrial Development Authority, Florida, Industrial Development Revenue Bonds,    12/06 at 100.00    BB+    1,257,663 
     Indiantown Cogeneration LP, Series 1994A, 7.875%, 12/15/25 (Alternative Minimum Tax)             
600    Martin County Industrial Development Authority, Florida, Industrial Development Revenue    12/06 at 100.00    BB+    604,200 
     Refunding Bonds, Indiantown Cogeneration LP, Series 1995B, 8.050%, 12/15/25 (Alternative             
     Minimum Tax)             
2,020    Total Florida            2,034,731 
    Illinois – 9.9%             
1,400    Chicago, Illinois, Tax Increment Allocation Bonds, Irving/Cicero Redevelopment Project, Series    1/09 at 100.00    N/R    1,470,882 
     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    526,435 
1,000     6.250%, 12/01/32    12/21 at 100.00    BBB    1,028,530 
1,000    Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational    5/12 at 101.00    Baa3    1,014,030 
     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    1,588,022 
     5.500%, 5/15/32             
1,700    Joliet Regional Port District, Illinois, Airport Facilities Revenue Bonds, Lewis University    7/07 at 103.00    N/R (3)    1,767,184 
     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 –    11/15 at 100.00    AAA    1,354,342 
     FGIC Insured             
8,455    Total Illinois            8,749,425 
    Indiana – 4.0%             
2,000    Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Riverview Hospital,    8/12 at 101.00    Baa1    2,130,800 
     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    1,407,260 
     Series 1998, 7.250%, 11/01/18 (Alternative Minimum Tax)             
3,305    Total Indiana            3,538,060 
    Louisiana – 2.5%             
1,745    Louisiana Public Facilities Authority, Extended Care Facilities Revenue Bonds, Comm-Care    No Opt. Call    BBB    2,170,885 
     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    1,008,950 
     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    538,565 
     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    280,087 
     Haverhill Project, Series 1998A, 5.450%, 12/01/12 (Alternative Minimum Tax)             
770    Total Massachusetts            818,652 
    Michigan – 3.7%             
1,000    Delta County Economic Development Corporation, Michigan, Environmental Improvement Revenue    4/12 at 100.00    AAA    1,106,880 
     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,    1/07 at 101.00    Ba3    2,184,422 
     Series 1995, 6.625%, 1/01/16             
3,150    Total Michigan            3,291,302 
    Montana – 1.4%             
1,200    Montana Board of Investments, Exempt Facility Revenue Bonds, Stillwater Mining Company, Series    7/10 at 101.00    B2    1,253,304 
     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+    1,074,600 
     5.900%, 11/01/27 (Alternative Minimum Tax)             
    New Hampshire – 0.8%             
400    New Hampshire Higher Educational and Health Facilities Authority, Revenue Bonds, New Hampshire    1/07 at 102.00    BBB–    410,284 
     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)    103,040 
200     6.375%, 1/01/27 (Pre-refunded 1/01/07)    1/07 at 102.00    BBB– (3)    206,174 
700    Total New Hampshire            719,498 
    New York – 6.1%             
1,000    Dormitory Authority of the State of New York, Revenue Bonds, Brooklyn Law School, Series    7/13 at 100.00    AA    1,079,480 
     2003A, 5.500%, 7/01/15 – RAAI Insured             
4,045    Yates County Industrial Development Agency, New York, FHA-Insured Civic Facility Mortgage    2/11 at 101.00    AA+    4,301,570 
     Revenue Bonds, Soldiers and Sailors Memorial Hospital, Series 2000A, 6.000%, 2/01/41             
5,045    Total New York            5,381,050 
    Ohio – 4.4%             
1,000    Erie County, Ohio, Hospital Facilities Revenue Bonds, Firelands Regional Medical Center,    8/16 at 100.00    A    1,026,990 
     Series 2006, 5.250%, 8/15/46             
2,400    Ohio Water Development Authority, Solid Waste Disposal Revenue Bonds, Bay Shore Power, Series    9/09 at 102.00    N/R    2,477,160 
     1998B, 6.625%, 9/01/20 (Alternative Minimum Tax)             
400    Ohio Water Development Authority, Solid Waste Disposal Revenue Bonds, BHP Steel LLC, Series    9/06 at 101.00    A+    406,116 
     1995, 6.300%, 9/01/20 (Alternative Minimum Tax)             
3,800    Total Ohio            3,910,266 
    Pennsylvania – 2.7%             
1,080    Allegheny County Hospital Development Authority, Pennsylvania, Revenue Bonds, West Penn    11/10 at 102.00    Ba3    1,277,618 
     Allegheny Health System, Series 2000B, 9.250%, 11/15/30             
1,010    Carbon County Industrial Development Authority, Pennsylvania, Resource Recovery Revenue    No Opt. Call    BBB–    1,064,580 
     Refunding Bonds, Panther Creek Partners Project, Series 2000, 6.650%, 5/01/10 (Alternative             
     Minimum Tax)             
2,090    Total Pennsylvania            2,342,198 
    Rhode Island – 0.7%             
500    Rhode Island Tobacco Settlement Financing Corporation, Tobacco Settlement Asset-Backed Bonds,    6/12 at 100.00    BBB    527,495 
     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–    2,719,675 
     2002, 5.500%, 12/01/13             
475    Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Series 1991, 6.750%,    No Opt. Call    AAA    590,981 
     1/01/19 – FGIC Insured (ETM)             
1,000    Tobacco Settlement Revenue Management Authority, South Carolina, Tobacco Settlement    5/11 at 101.00    BBB    1,056,270 
     Asset-Backed Bonds, Series 2001B, 6.000%, 5/15/22             
3,975    Total South Carolina            4,366,926 
    Tennessee – 2.5%             
1,000    Knox County Health, Educational and Housing Facilities Board, Tennessee, Hospital Revenue    4/12 at 101.00    Baa3    1,081,130 
     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)    428,753 
625     6.500%, 9/01/26 (Pre-refunded 9/01/12)    9/12 at 100.00    A– (3)    714,588 
2,000    Total Tennessee            2,224,471 
    Texas – 9.3%             
1,500    Cameron Education Finance Corporation, Texas, Charter School Revenue Bonds, Faith Family    8/16 at 100.00    A    1,515,120 
     Academy Charter School, Series 2006A, 5.250%, 8/15/36 – ACA Insured             
2,000    Gulf Coast Waste Disposal Authority, Texas, Sewerage and Solid Waste Disposal Revenue Bonds,    4/12 at 100.00    A+    2,145,260 
     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    1,970,080 
     Light and Power Company, Series 1995, 4.000%, 10/15/15 – MBIA Insured             
    Weslaco Health Facilities Development Corporation, Texas, Hospital Revenue Bonds, Knapp             
    Medical Center, Series 2002:             
2,000     6.250%, 6/01/25    6/12 at 100.00    BBB+    2,131,320 
50     6.250%, 6/01/32    6/12 at 100.00    BBB+    53,060 
1,000    West Texas Independent School District, McLennan and Hill Counties, General Obligation    8/13 at 51.84    AAA    367,220 
     Refunding Bonds, Series 1998, 0.000%, 8/15/25             
8,550    Total Texas            8,182,060 
    Virgin Islands – 3.0%             
2,545    Virgin Islands Public Finance Authority, Senior Lien Matching Fund Loan Note, Series 2004A,    10/14 at 100.00    BBB    2,651,992 
     5.250%, 10/01/19             
    Virginia – 3.1%             
1,000    Chesterfield County Industrial Development Authority, Virginia, Pollution Control Revenue    11/10 at 102.00    Baa1    1,076,420 
     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    Baa1    1,668,450 
     Cogeneration LP, Series 2002, 6.500%, 10/15/17 (Alternative Minimum Tax)             
2,500    Total Virginia            2,744,870 
    West Virginia – 2.4%             
2,050    Mason County, West Virginia, Pollution Control Revenue Bonds, Appalachian Power Company,    10/11 at 100.00    BBB    2,095,551 
     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    1,069,580 
     Series 2001, 6.250%, 10/01/21             
$        89,240    Total Investments (cost $81,760,137) – 98.7%            86,946,684 
    Other Assets Less Liabilities – 1.3%            1,140,891 
    Net Assets – 100%           $   88,087,575 

(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 July 31, 2006, the cost of investments was $81,689,312.

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

Gross unrealized:     
  Appreciation    $5,440,445 
  Depreciation    (183,073) 
Net unrealized appreciation (depreciation) of investments    $5,257,372 

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         September 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         September 28, 2006        

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

Date        September 28, 2006        

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