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         811-09475         

        Nuveen Insured Dividend Advantage 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:            10/31          

Date of reporting period:         1/31/09         

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 Insured Dividend Advantage Municipal Fund (NVG)             
    January 31, 2009             
Principal        Optional Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Municipal Bonds – 151.5% (97.8% of Total Investments)             
    Alabama – 2.1% (1.3% of Total Investments)             
$       5,310    Athens, Alabama, Water and Sewerage Revenue Warrants, Series 2002, 5.300%, 5/01/32 –    5/12 at 101.00    AA   $   5,212,084 
     MBIA Insured             
3,045    Hoover, Alabama, General Obligation Bonds, Series 2003, 5.000%, 3/01/20 – MBIA Insured    3/12 at 101.00    AA    3,236,805 
8,355    Total Alabama            8,448,889 
    Alaska – 4.2% (2.7% of Total Investments)             
15,000    Alaska, International Airport System Revenue Bonds, Series 2002B, 5.250%, 10/01/27    10/12 at 100.00    Aa3 (4)    17,061,148 
     (Pre-refunded 10/01/12) – AMBAC Insured             
    Arizona – 2.1% (1.3% of Total Investments)             
5,000    Phoenix, Arizona, Civic Improvement Corporation, Senior Lien Airport Revenue Bonds, Series    7/12 at 100.00    AA    4,118,250 
     2002B, 5.250%, 7/01/32 – FGIC Insured (Alternative Minimum Tax)             
6,000    Phoenix, Arizona, Civic Improvement Revenue Bonds, Civic Plaza, Series 2005B, 0.000%, 7/01/37 –    No Opt. Call    AA    4,364,400 
     FGIC Insured             
11,000    Total Arizona            8,482,650 
    California – 14.2% (9.2% of Total Investments)             
2,000    Alameda Corridor Transportation Authority, California, Subordinate Lien Revenue Bonds, Series    No Opt. Call    A    1,036,820 
     2004A, 0.000%, 10/01/20 – AMBAC Insured             
    California Educational Facilities Authority, Revenue Bonds, Occidental College, Series 2005A:             
1,485     5.000%, 10/01/26 – MBIA Insured    10/15 at 100.00    Aa3    1,488,237 
1,565     5.000%, 10/01/27 – MBIA Insured    10/15 at 100.00    Aa3    1,551,760 
    California, General Obligation Bonds, Series 2000:             
375     5.250%, 9/01/17 (Pre-refunded 9/01/10) – MBIA Insured    9/10 at 100.00    AA (4)    398,528 
190     5.250%, 9/01/17 (Pre-refunded 9/01/10) – MBIA Insured    9/10 at 100.00    AA (4)    203,386 
8,890    California, General Obligation Veterans Welfare Bonds, Series 1997BH, 5.400%, 12/01/14    6/09 at 101.00    AA–    8,988,057 
     (Alternative Minimum Tax)             
3,000    California, General Obligation Veterans Welfare Bonds, Series 2001BZ, 5.375%, 12/01/24 – MBIA    6/09 at 100.00    AA    2,683,230 
     Insured (Alternative Minimum Tax)             
2,425    Fullerton Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2005,    9/15 at 100.00    A    2,028,779 
     5.000%, 9/01/27 – AMBAC Insured             
    Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement             
    Asset-Backed Bonds, Series 2007A-1:             
1,000     5.750%, 6/01/47    6/17 at 100.00    BBB    604,050 
365     5.125%, 6/01/47    6/17 at 100.00    BBB    196,312 
18,665    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/15 at 100.00    A    15,215,333 
     Revenue Bonds, Series 2005A, 5.000%, 6/01/35 – FGIC Insured             
1,990    Kern Community College District, California, General Obligation Bonds, Series 2006, 0.000%,    No Opt. Call    AAA    787,224 
     11/01/25 – FSA Insured             
7,935    Los Angeles, California, Certificates of Participation, Series 2002, 5.300%, 4/01/32 – AMBAC Insured    4/12 at 100.00    AA–    7,695,601 
2,220    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series    7/10 at 100.00    AAA    1,992,872 
     1998A, 5.200%, 7/01/32 – MBIA Insured             
2,320    Sacramento Municipal Utility District, California, Electric Revenue Bonds, Series 2001P,    8/11 at 100.00    AAA    2,418,902 
     5.250%, 8/15/18 – FSA Insured             
    San Francisco Unified School District, California, General Obligation Bonds, Series 2007A:             
1,000     3.000%, 6/15/25 – FSA Insured    6/17 at 100.00    AAA    750,990 
1,180     3.000%, 6/15/26 – FSA Insured    6/17 at 100.00    AAA    858,332 
6,720    San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment    8/17 at 100.00    AA    4,640,160 
     Project, Series 2006C, 4.250%, 8/01/30 – MBIA Insured             
4,275    Sequoia Union High School District, San Mateo County, California, General Obligation Bonds,    7/14 at 102.00    Aa2    3,163,671 
     Series 2006, 3.500%, 7/01/29 (WI/DD, Settling 2/03/09) – FSA Insured             
1,690    Ventura County Community College District, California, General Obligation Bonds, Series 2005B,    8/15 at 100.00    AA    1,687,904 
     5.000%, 8/01/28 – MBIA Insured             
69,290    Total California            58,390,148 
    Colorado – 5.2% (3.4% of Total Investments)             
17,300    Adams County, Colorado, FHA-Insured Mortgage Revenue Bonds, Platte Valley Medical Center,    8/15 at 100.00    AA    16,257,673 
     Series 2005, 5.000%, 8/01/24 – MBIA Insured             
750    Arkansas River Power Authority, Colorado, Power Revenue Bonds, Series 2006, 5.250%, 10/01/32 –    10/16 at 100.00    BBB    627,938 
     SYNCORA GTY Insured             
17,000    E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B, 0.000%, 9/01/25 –    No Opt. Call    AA–    4,569,600 
     MBIA Insured             
35,050    Total Colorado            21,455,211 
    District of Columbia – 1.5% (1.0% of Total Investments)             
6,805    District of Columbia, Revenue Bonds, Georgetown University, Series 2007A, 4.500%, 4/01/42 –    4/17 at 100.00    A    5,456,861 
     AMBAC Insured             
935    Washington Convention Center Authority, District of Columbia, Senior Lien Dedicated Tax    10/16 at 100.00    AAA    659,138 
     Revenue Bonds, Series 2007, Residuals 1606, 11.765%, 10/01/30 – AMBAC Insured (IF)             
7,740    Total District of Columbia            6,115,999 
    Florida – 12.1% (7.8% of Total Investments)             
    Florida Municipal Loan Council, Revenue Bonds, Series 2003B:             
2,305     5.250%, 12/01/17 – MBIA Insured    12/13 at 100.00    AA    2,480,802 
1,480     5.250%, 12/01/18 – MBIA Insured    12/13 at 100.00    AA    1,577,206 
11,600    Greater Orlando Aviation Authority, Florida, Airport Facilities Revenue Bonds, Series 2002B,    10/12 at 100.00    AAA    11,124,168 
     5.125%, 10/01/21 – FSA Insured (Alternative Minimum Tax)             
8,155    Lee County, Florida, Solid Waste System Revenue Refunding Bonds, Series 2001, 5.625%, 10/01/13 –    10/11 at 100.00    A3    8,516,267 
     MBIA Insured (Alternative Minimum Tax)             
    Miami-Dade County, Florida, Aviation Revenue Bonds, Miami International Airport, Series 2002:             
7,165     5.625%, 10/01/15 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AA    7,351,505 
5,600     5.750%, 10/01/16 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AA    5,736,920 
10,000     5.125%, 10/01/21 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AA    9,130,800 
2,000     5.250%, 10/01/22 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AA    1,806,700 
1,000    South Miami Health Facilities Authority, Florida, Hospital Revenue, Baptist Health System    8/17 at 100.00    AA–    771,430 
     Obligation Group, Series 2007, 5.000%, 8/15/42 (UB)             
1,000    Tallahassee, Florida, Energy System Revenue Bonds, Series 2005, 5.000%, 10/01/28 – MBIA Insured    10/15 at 100.00    AA    986,380 
50,305    Total Florida            49,482,178 
    Georgia – 2.3% (1.5% of Total Investments)             
6,925    Atlanta and Fulton County Recreation Authority, Georgia, Guaranteed Revenue Bonds, Park    12/15 at 100.00    AA    6,860,944 
     Improvement, Series 2005A, 5.000%, 12/01/30 – MBIA Insured             
1,000    Atlanta, Georgia, Water and Wastewater Revenue Bonds, Series 2004, 5.000%, 11/01/22 –    11/14 at 100.00    AAA    1,027,480 
     FSA Insured             
1,695    Georgia Housing and Finance Authority, Single Family Mortgage Bonds, Series 2002B-2, 5.500%,    12/11 at 100.00    AAA    1,563,214 
     6/01/32 (Alternative Minimum Tax)             
9,620    Total Georgia            9,451,638 
    Idaho – 1.1% (0.7% of Total Investments)             
    Idaho Housing and Finance Association, Grant and Revenue Anticipation Bonds, Federal Highway             
    Trust Funds, Series 2006:             
3,000     5.000%, 7/15/23 – MBIA Insured    7/16 at 100.00    Aa3    3,158,940 
1,130     5.000%, 7/15/24 – MBIA Insured    7/16 at 100.00    Aa3    1,176,997 
4,130    Total Idaho            4,335,937 
    Illinois – 11.8% (7.6% of Total Investments)             
10,000    Bolingbrook, Illinois, General Obligation Bonds, Series 2002A, 5.375%, 1/01/38 (Pre-refunded    1/12 at 100.00    A2 (4)    11,168,100 
     1/01/12) – FGIC Insured             
1,305    Chicago, Illinois, General Obligation Bonds, Series 2001A, 5.500%, 1/01/38 – MBIA Insured    1/11 at 101.00    AA    1,314,709 
    Chicago, Illinois, General Obligation Bonds, Series 2001A:             
50     5.500%, 1/01/38 (Pre-refunded 1/01/11) – MBIA Insured    1/11 at 101.00    AA (4)    54,672 
3,645     5.500%, 1/01/38 (Pre-refunded 1/01/11) – MBIA Insured    1/11 at 101.00    AA (4)    3,985,552 
    Chicago, Illinois, Second Lien Passenger Facility Charge Revenue Bonds, O’Hare International             
    Airport, Series 2001C:             
4,250     5.500%, 1/01/16 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    A1    4,327,648 
4,485     5.500%, 1/01/17 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    A1    4,534,111 
4,730     5.500%, 1/01/18 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    A1    4,761,407 
2,930     5.500%, 1/01/19 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    A1    2,936,886 
3,600    Chicago, Illinois, Third Lien General Airport Revenue Bonds, O’Hare International Airport,    1/16 at 100.00    AA    3,559,500 
     Series 2005A, 5.250%, 1/01/24 – MBIA Insured             
3,000    Chicago, Illinois, Third Lien General Airport Revenue Refunding Bonds, O’Hare International    1/12 at 100.00    AA    3,052,950 
     Airport, Series 2002A, 5.750%, 1/01/17 – MBIA Insured (Alternative Minimum Tax)             
4,000    Cicero, Cook County, Illinois, General Obligation Corporate Purpose Bonds, Series 2002,    12/12 at 101.00    AA    3,664,280 
     5.000%, 12/01/21 – MBIA Insured             
480    DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,    10/13 at 100.00    Aa3    516,557 
     Series 2003C, 5.250%, 10/01/22 – FSA Insured             
    DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,             
    Series 2003C:             
770     5.250%, 10/01/22 (Pre-refunded 10/01/13) – FSA Insured    10/13 at 100.00    Aa3 (4)    893,878 
250     5.250%, 10/01/22 (Pre-refunded 10/01/13) – FSA Insured    10/13 at 100.00    Aa3 (4)    290,220 
3,500    Illinois Municipal Electric Agency, Power Supply System Revenue Bonds, Series 2007A, 5.000%,    2/17 at 100.00    AA    3,191,895 
     2/01/35 – FGIC Insured             
46,995    Total Illinois            48,252,365 
    Indiana – 17.3% (11.1% of Total Investments)             
3,380    Evansville, Indiana, Sewerage Works Revenue Refunding Bonds, Series 2003A, 5.000%, 7/01/20 –    7/13 at 100.00    A    3,425,292 
     AMBAC Insured             
    Indiana Bond Bank, Special Program Bonds, Hendricks County Redevelopment District, Series 2002D:             
2,500     5.375%, 4/01/23 (Pre-refunded 4/01/12) – AMBAC Insured    4/12 at 100.00    AA (4)    2,813,200 
7,075     5.250%, 4/01/26 (Pre-refunded 4/01/12) – AMBAC Insured    4/12 at 100.00    AA (4)    7,933,976 
7,000     5.250%, 4/01/30 (Pre-refunded 4/01/12) – AMBAC Insured    4/12 at 100.00    AA (4)    7,849,870 
10,000    Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Marion General Hospital,    7/12 at 100.00    A    7,911,800 
     Series 2002, 5.250%, 7/01/32 – AMBAC Insured             
3,200    Indiana Municipal Power Agency, Power Supply Revenue Bonds, Series 2007A, 5.000%, 1/01/42 –    1/17 at 100.00    AA    2,808,768 
     MBIA Insured             
25,000    Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,    7/12 at 100.00    AAA    28,099,748 
     5.250%, 7/01/33 (Pre-refunded 7/01/12) – MBIA Insured             
    Northern Wells Community School Building Corporation, Wells County, Indiana, First Mortgage             
    Bonds, Series 2001:             
420     5.250%, 1/15/19 (Pre-refunded 7/15/12) – FGIC Insured    7/12 at 100.00    AA+ (4)    475,541 
430     5.250%, 7/15/19 (Pre-refunded 7/15/12) – FGIC Insured    7/12 at 100.00    AA+ (4)    486,863 
1,675     5.400%, 7/15/23 (Pre-refunded 7/15/12) – FGIC Insured    7/12 at 100.00    AA+ (4)    1,904,978 
6,960    Valparaiso Middle School Building Corporation, Indiana, First Mortgage Refunding Bonds, Series    1/13 at 100.00    AA+    7,097,390 
     2002, 5.000%, 7/15/24 – MBIA Insured             
67,640    Total Indiana            70,807,426 
    Louisiana – 2.9% (1.9% of Total Investments)             
1,325    Louisiana Public Facilities Authority, Revenue Bonds, Baton Rouge General Hospital, Series 2004,    7/14 at 100.00    AA    1,256,498 
     5.250%, 7/01/24 – MBIA Insured             
    Louisiana State, Gasoline and Fuels Tax Revenue Bonds, Series 2006:             
770     4.750%, 5/01/39 – FSA Insured (UB)    5/16 at 100.00    Aa3    707,553 
8,270     4.500%, 5/01/41 – FGIC Insured (UB)    5/16 at 100.00    Aa3    7,066,963 
3    Louisiana State, Gasoline Tax Revenue Bonds, Series 2006, Residuals 660-3, 15.130%, 5/01/41 –    5/16 at 100.00    Aa3    1,394 
     FGIC Insured (IF)             
3,085    New Orleans, Louisiana, General Obligation Refunding Bonds, Series 2002, 5.125%, 9/01/21 –    9/12 at 100.00    AA    2,797,972 
     MBIA Insured             
13,453    Total Louisiana            11,830,380 
    Massachusetts – 0.6% (0.4% of Total Investments)             
2,775    Massachusetts Water Resources Authority, General Revenue Bonds, 4.500%, 8/01/46 –    2/17 at 100.00    AAA    2,354,588 
     FSA Insured (UB)             
    Michigan – 0.3% (0.2% of Total Investments)             
1,500    Michigan State Hospital Finance Authority, Revenue Bonds, Trinity Health Care Group, Series    12/16 at 100.00    Aa2    1,325,715 
     2006A, 5.000%, 12/01/31 (UB)             
    Minnesota – 0.5% (0.3% of Total Investments)             
2,000    Northern Municipal Power Agency, Minnesota, Electric System Revenue Bonds, Refunding Series    No Opt. Call    AAA    2,189,300 
     2009A, 5.000%, 1/01/15 (WI/DD, Settling 2/11/09) – AGC Insured             
    Missouri – 0.4% (0.3% of Total Investments)             
1,600    St. Louis County Pattonville School District R3, Missouri, General Obligation Bonds, Series 2004,    3/14 at 100.00    AAA    1,764,640 
     5.250%, 3/01/19 – FSA Insured             
    Nebraska – 2.0% (1.3% of Total Investments)             
6,360    Lincoln, Nebraska, Electric System Revenue Bonds, Series 2005, 5.000%, 9/01/32    9/15 at 100.00    AA    6,264,473 
    Municipal Energy Agency of Nebraska, Power Supply System Revenue Bonds, Series 2003A:             
1,000     5.250%, 4/01/20 – FSA Insured    4/13 at 100.00    AAA    1,073,680 
1,000     5.250%, 4/01/21 – FSA Insured    4/13 at 100.00    AAA    1,040,490 
8,360    Total Nebraska            8,378,643 
    Nevada – 2.3% (1.5% of Total Investments)             
8,750    Truckee Meadows Water Authority, Nevada, Water Revenue Bonds, Series 2001A, 5.250%, 7/01/34    7/11 at 100.00    AAA    9,615,638 
     (Pre-refunded 7/01/11) – FSA Insured             
    New Jersey – 0.6% (0.4% of Total Investments)             
2,150    New Jersey Transportation Trust Fund Authority, Transportation System Bonds, Series 2006A,    No Opt. Call    AA–    2,368,806 
     5.250%, 12/15/20             
    New York – 5.2% (3.4% of Total Investments)             
1,120    Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Montefiore    2/15 at 100.00    AA    1,087,722 
     Hospital, Series 2004, 5.000%, 8/01/23 – FGIC Insured             
3,660    Dormitory Authority of the State of New York, Revenue Bonds, Mental Health Services Facilities    2/15 at 100.00    AA–    3,661,061 
     Improvements, Series 2005B, 5.000%, 2/15/23 – AMBAC Insured             
3,130    Hudson Yards Infrastructure Corporation, New York, Revenue Bonds, Series 2006A, 4.500%,    2/17 at 100.00    AA    2,318,328 
     2/15/47 – MBIA Insured             
2,400    Long Island Power Authority, New York, Electric System Revenue Bonds, Series 2006F, 4.250%,    11/16 at 100.00    AA    1,871,808 
     5/01/33 – MBIA Insured             
1,500    Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series 2005B,    11/15 at 100.00    A    1,418,055 
     5.000%, 11/15/30 – AMBAC Insured             
10,000    Metropolitan Transportation Authority, New York, Transportation Revenue Refunding Bonds,    11/12 at 100.00    AAA    9,564,400 
     Series 2002A, 5.000%, 11/15/30 – FSA Insured             
1,435    New York City Industrial Development Agency, New York, Revenue Bonds, Yankee Stadium Project    3/19 at 100.00    AAA    1,513,093 
     Pilot, Series 2009A, 7.000%, 3/01/49 (WI/DD, Settling 2/05/09) – AGC Insured             
23,245    Total New York            21,434,467 
    North Carolina – 0.5% (0.3% of Total Investments)             
2,125    North Carolina Medical Care Commission, FHA-Insured Mortgage Revenue Bonds, Betsy Johnson    10/13 at 100.00    AAA    2,077,974 
     Regional Hospital Project, Series 2003, 5.375%, 10/01/24 – FSA Insured             
    Ohio – 0.4% (0.3% of Total Investments)             
    Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Revenue             
    Bonds, Senior Lien, Series 2007A-2:             
70     5.125%, 6/01/24    6/17 at 100.00    BBB    51,347 
710     5.875%, 6/01/30    6/17 at 100.00    BBB    453,967 
685     5.750%, 6/01/34    6/17 at 100.00    BBB    408,459 
1,570     5.875%, 6/01/47    6/17 at 100.00    BBB    888,400 
3,035    Total Ohio            1,802,173 
    Oklahoma – 0.4% (0.3% of Total Investments)             
2,000    Oklahoma Development Finance Authority, Revenue Bonds, Saint John Health System, Series 2007,    2/17 at 100.00    AA–    1,697,900 
     5.000%, 2/15/37             
    Oregon – 1.6% (1.0% of Total Investments)             
    Oregon, General Obligation Veterans Welfare Bonds, Series 82:             
4,530     5.375%, 12/01/31    12/11 at 100.00    AA    4,416,252 
2,115     5.500%, 12/01/42    12/11 at 100.00    AA    2,098,757 
6,645    Total Oregon            6,515,009 
    Pennsylvania – 3.6% (2.3% of Total Investments)             
4,500    Allegheny County, Pennsylvania, Airport Revenue Refunding Bonds, Pittsburgh International    No Opt. Call    AA    4,713,030 
     Airport, Series 1997A, 5.750%, 1/01/13 – MBIA Insured (Alternative Minimum Tax)             
4,130    Pennsylvania Public School Building Authority, Lease Revenue Bonds, School District of    12/16 at 100.00    AAA    3,508,642 
     Philadelphia, Series 2006B, 4.500%, 6/01/32 – FSA Insured (UB)             
1,050    Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Series 2006A, 5.000%, 12/01/26 –    6/16 at 100.00    Aa3    1,049,927 
     AMBAC Insured             
2,000    Philadelphia Municipal Authority, Pennsylvania, Lease Revenue Bonds, Series 2003B, 5.250%,    11/13 at 100.00    AAA    2,177,000 
     11/15/18 – FSA Insured             
2,000    Reading School District, Berks County, Pennsylvania, General Obligation Bonds, Series 2005,    1/16 at 100.00    Aa3    2,204,080 
     5.000%, 1/15/19 – FSA Insured (UB)             
1,000    State Public School Building Authority, Pennsylvania, Lease Revenue Bonds, Philadelphia School    6/13 at 100.00    AAA    1,147,520 
     District, Series 2003, 5.000%, 6/01/23 (Pre-refunded 6/01/13) – FSA Insured             
14,680    Total Pennsylvania            14,800,199 
    Puerto Rico – 0.4% (0.3% of Total Investments)             
1,225    Puerto Rico Municipal Finance Agency, Series 2005C, 5.250%, 8/01/21 – CIFG Insured    No Opt. Call    BBB–    1,129,793 
5,000    Puerto Rico Sales Tax Financing Corporation, Sales Tax Revenue Bonds, Series 2007A, 0.000%,    No Opt. Call    AA–    498,100 
     8/01/42 – FGIC Insured             
6,225    Total Puerto Rico            1,627,893 
    South Carolina – 1.6% (1.0% of Total Investments)             
1,950    Greenville County School District, South Carolina, Installment Purchase Revenue Bonds, Series    12/16 at 100.00    AAA    1,956,143 
     2006, 5.000%, 12/01/28 – FSA Insured             
    Greenville, South Carolina, Tax Increment Revenue Improvement Bonds, Series 2003:             
1,000     5.500%, 4/01/17 – MBIA Insured    4/13 at 100.00    AA    1,107,380 
2,300     5.000%, 4/01/21 – MBIA Insured    4/13 at 100.00    AA    2,374,911 
1,000    Scago Educational Facilities Corporation, South Carolina, Installment Purchase Revenue Bonds,    10/15 at 100.00    AAA    1,054,570 
     Spartanburg County School District 5, Series 2005, 5.000%, 4/01/21 – FSA Insured             
6,250    Total South Carolina            6,493,004 
    Tennessee – 11.0% (7.1% of Total Investments)             
    Memphis, Tennessee, Sanitary Sewerage System Revenue Bonds, Series 2004:             
1,495     5.000%, 10/01/19 – FSA Insured    10/14 at 100.00    AAA    1,627,472 
1,455     5.000%, 10/01/20 – FSA Insured    10/14 at 100.00    AAA    1,551,627 
1,955     5.000%, 10/01/21 – FSA Insured    10/14 at 100.00    AAA    2,062,310 
10,000    Memphis-Shelby County Sports Authority, Tennessee, Revenue Bonds, Memphis Arena, Series 2002A,    11/12 at 100.00    AA– (4)    11,292,400 
     5.125%, 11/01/28 (Pre-refunded 11/01/12) – AMBAC Insured             
10,000    Memphis-Shelby County Sports Authority, Tennessee, Revenue Bonds, Memphis Arena, Series 2002B,    11/12 at 100.00    AA– (4)    11,292,400 
     5.125%, 11/01/29 (Pre-refunded 11/01/12) – AMBAC Insured             
15,195    Tennessee State School Bond Authority, Higher Educational Facilities Second Program Bonds,    5/12 at 100.00    AAA    17,051,067 
     Series 2002A, 5.250%, 5/01/32 (Pre-refunded 5/01/12) – FSA Insured             
40,100    Total Tennessee            44,877,276 
    Texas – 23.1% (14.9% of Total Investments)             
3,500    Dallas-Ft. Worth International Airport, Texas, Joint Revenue Refunding and Improvement Bonds,    11/11 at 100.00    AA    3,694,670 
     Series 2001A, 5.750%, 11/01/13 – FGIC Insured (Alternative Minimum Tax)             
10,000    Gainesville Hospital District, Texas, Limited Tax General Obligation Bonds, Series 2002,    8/11 at 100.00    A3 (4)    11,001,000 
     5.375%, 8/15/32 (Pre-refunded 8/15/11) – MBIA Insured             
1,210    Galveston, Texas, General Obligation Bonds, Series 2001, 5.250%, 5/01/21 – AMBAC Insured    5/11 at 100.00    A    1,246,143 
    Harris County Health Facilities Development Corporation, Texas, Thermal Utility Revenue Bonds,             
    TECO Project, Series 2003:             
2,240     5.000%, 11/15/16 – MBIA Insured    11/13 at 100.00    AA    2,379,104 
2,355     5.000%, 11/15/17 – MBIA Insured    11/13 at 100.00    AA    2,481,935 
13,000    Houston Area Water Corporation, Texas, Contract Revenue Bonds, Northeast Water Purification    3/12 at 100.00    N/R (4)    14,431,690 
     Plant, Series 2002, 5.125%, 3/01/32 (Pre-refunded 3/01/12) – FGIC Insured             
1,000    Houston, Texas, First Lien Combined Utility System Revenue Bonds, Series 2004A, 5.250%,    5/14 at 100.00    AA    1,006,800 
     5/15/24 – FGIC Insured             
4,345    San Antonio, Texas, Water System Senior Lien Revenue Refunding Bonds, Series 2002, 5.500%,    5/12 at 100.00    AAA    4,797,315 
     5/15/17 – FSA Insured             
5,510    Texas Department of Housing and Community Affairs, Residential Mortgage Revenue Bonds, Series    7/11 at 100.00    AAA    5,168,931 
     2001A, 5.350%, 7/01/33 (Alternative Minimum Tax)             
8,350    Texas Department of Housing and Community Affairs, Single Family Mortgage Bonds, Series 2002B,    3/12 at 100.00    AAA    7,678,994 
     5.550%, 9/01/33 – MBIA Insured (Alternative Minimum Tax)             
    Texas Public Finance Authority, Revenue Bonds, Texas Southern University Financing System,             
    Series 2002:             
3,520     5.125%, 11/01/20 – MBIA Insured    5/12 at 100.00    Baa1    3,269,587 
3,520     5.125%, 11/01/21 – MBIA Insured    5/12 at 100.00    Baa1    3,183,734 
    Texas Student Housing Authority, Revenue Bonds, Austin Project, Senior Series 2001A:             
9,400     5.375%, 1/01/23 – MBIA Insured    1/12 at 102.00    Baa1    5,601,084 
11,665     5.500%, 1/01/33 – MBIA Insured    1/12 at 102.00    Baa1    5,932,236 
5,000    Texas Water Development Board, Senior Lien State Revolving Fund Revenue Bonds, Series 1999B,    1/10 at 100.00    AAA    5,166,450 
     5.250%, 7/15/17             
9,145    Texas, General Obligation Bonds, Veterans Housing Assistance Program Fund II, Series 2002A-1,    6/12 at 100.00    Aa1    8,910,156 
     5.250%, 12/01/22 (Alternative Minimum Tax)             
    Williamson County, Texas, General Obligation Bonds, Series 2002:             
3,000     5.250%, 2/15/22 (Pre-refunded 2/15/12) – FSA Insured    2/12 at 100.00    AAA    3,355,140 
5,000     5.250%, 2/15/25 (Pre-refunded 2/15/12) – FSA Insured    2/12 at 100.00    AAA    5,591,900 
101,760    Total Texas            94,896,869 
    Utah – 1.7% (1.1% of Total Investments)             
7,290    Utah Transit Authority, Sales Tax Revenue Bonds, Series 2008, Trust 1193, 9.146%, 6/15/36 –    6/18 at 100.00    AAA    6,970,406 
     FSA Insured (IF)             
    Washington – 15.2% (9.8% of Total Investments)             
5,385    Energy Northwest, Washington Public Power, Nine Canyon Wind Project Revenue Bonds, Series    7/16 at 100.00    A    4,651,078 
     2006A, 4.500%, 7/01/30 – AMBAC Insured             
6,600    Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station –    7/12 at 100.00    AAA    7,053,750 
     Nuclear Project 2, Series 2002B, 5.350%, 7/01/18 – FSA Insured             
7,675    Energy Northwest, Washington, Electric Revenue Refunding Bonds, Nuclear Project 1, Series    7/12 at 100.00    Aaa    8,431,602 
     2002A, 5.500%, 7/01/15 – MBIA Insured             
2,500    Port of Seattle, Washington, Revenue Refunding Bonds, Series 2002D, 5.750%, 11/01/15 – FGIC    11/12 at 100.00    AA    2,641,950 
     Insured (Alternative Minimum Tax)             
2,200    Snohomish County School District 2, Everett, Washington, General Obligation Bonds, Series    12/13 at 100.00    AAA    2,454,518 
     2003B, 5.000%, 6/01/17 – FSA Insured             
3,255    Thurston and Pierce Counties School District, Washington, General Obligation Bonds, Yelm    6/13 at 100.00    Aa1    3,610,934 
     Community Schools, Series 2003, 5.250%, 12/01/16 – FSA Insured             
10,000    University of Washington, General Revenue Bonds, Refunding Series 2007, 5.000%, 6/01/37 –    6/17 at 100.00    AA+    9,675,700 
     AMBAC Insured             
    Washington State Economic Development Finance Authority, Wastewater Revenue Bonds, LOTT             
    Project, Series 2002:             
2,000     5.500%, 6/01/17 – AMBAC Insured    6/12 at 100.00    A2    2,181,640 
4,325     5.125%, 6/01/22 – AMBAC Insured    6/12 at 100.00    A2    4,431,698 
15,000    Washington State Healthcare Facilities Authority, Revenue Bonds, Harrison Memorial Hospital,    8/13 at 102.00    A    11,764,050 
     Series 1998, 5.000%, 8/15/28 – AMBAC Insured             
5,170    Whitman County School District 267, Pullman, Washington, General Obligation Bonds, Series    6/12 at 100.00    Aa1    5,504,188 
     2002, 5.000%, 12/01/20 – FSA Insured             
64,110    Total Washington            62,401,108 
    Wisconsin – 3.3% (2.1% of Total Investments)             
11,950    Wisconsin, Transportation Revenue Refunding Bonds, Series 2002-1, 5.125%, 7/01/18    7/12 at 100.00    AA+ (4)    13,463,109 
     (Pre-refunded 7/01/12) – AMBAC Insured             
$ 655,128    Total Municipal Bonds (cost $626,931,375)            621,168,686 
Shares    Description (1)          Value 
    Investment Companies – 0.3% (0.2% of Total Investments)           
21,650    BlackRock MuniHoldings Fund Inc.          253,738 
13,600    BlacRock MuniEnhanced Fund Inc.          113,016 
7,920    Dreyfus Strategic Municipal Fund          51,797 
7,600    Morgan Stanley Dean Witter Insured Municipal Income Trust          90,668 
9,668    Morgan Stanley Quality Municipal Income Trust          98,227 
26,280    PIMCO Municipal Income Fund II          207,875 
9,500    Van Kampen Advantage Municipal Income Fund II          84,930 
28,680    Van Kampen Investment Grade Municipal Trusst          309,744 
6,240    Van Kampen Municipal Trust          73,382 
    Total Investment Companies (cost $1,690,861)          1,283,377 
    Total Long-Term Investments (cost $628,622,236) – 151.8%          622,452,063 
Principal               
Amount (000)    Description (1)      Ratings (3)    Value 
    Short-Term Investments – 3.0% (2.0% of Total Investments)           
$         5,325    Maryland Transportation Authority, Revenue Bonds, Transportation Facilities Projects, Variable Rate      AAA    5,325,000 
     Demand Obligations, Series 2008, Trust R-11436, 4.500%, 7/01/41 – FSA Insured (5)           
2,075    New Jersey Housing and Mortgage Finance Agency, Capital Fund Program Revenue Bonds, Tender      Aa3    2,075,000 
     Option Bond, Trust 2008-3034X, Variable Rate Demand Obligations, 5.000%, 5/01/27 –           
     FSA Insured (5)           
5,000    Sacramento Municipal Utility District, California, Electric Revenue Bonds, Refunding Series      A-1+    5,000,000 
     2008 Trust 3301, Variable Rate Demand Obligations, 0.930%, 2/15/16 – FSA Insured (5)           
$        12,400    Total Short-Term Investments (cost $12,400,000)          12,400,000 
    Total Investments (cost $641,022,236) – 154.8%          634,852,063 
    Floating Rate Obligations – (3.4)%          (14,143,334) 
    Other Assets Less Liabilities – 3.9%          16,364,478 
    Auction Rate Preferred Shares, at Liquidation Value – (55.3)% (6)          (226,975,000)
    Net Assets Applicable to Common Shares – 100%        $  410,098,207 

    At least 80% of the Fund’s net assets (including net assets attributable to Auction Rate Preferred shares) 
    are invested in municipal securities that are covered by insurance or backed by an escrow or trust account 
    containing sufficient U.S. Government or U.S. Government agency securities or U.S. Treasury-issued State 
    and Local Government Series securities to ensure the timely payment of principal and interest. 
(1)    All percentages shown in the Portfolio of Investments are based on net assets applicable to Common shares 
    unless otherwise noted. 
(2)    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. 
(3)    Ratings: Using the higher of Standard & Poor’s Group (“Standard & Poor’s”) or Moody’s Investor Service, Inc. 
    (“Moody’s”) rating. Ratings below BBB by Standard & Poor’s or Baa by Moody’s are considered to be 
    below investment grade. 
    The Portfolio of Investments may reflect the ratings on certain bonds insured by ACA, AGC, AMBAC, CIFG, 
    FGIC, FSA, MBIA, RAAI and SYNCORA as of January 31, 2009. Subsequent to January 31, 2009, and 
    during the period this Portfolio of Investments was prepared, there may have been reductions to the 
    ratings of certain bonds resulting from changes to the ratings of the underlying insurers both during the 
    period and after period end. Such reductions would likely reduce the effective rating of many of the bonds 
    insured by that insurer or insurers presented at period end. 
(4)    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. 
(5)    Investment has a maturity of more than one year, but has variable rate and demand features which qualify 
    it as a short-term investment. The rate disclosed is that in effect at the end of the reporting period. This 
    rate changes periodically based on market conditions or a specified market index. 
(6)    Auction Rate Preferred Shares, at Liquidation Value as a percentage of Total Investments is 35.8%. 
N/R    Not rated. 
WI/DD    Purchased on a when-issued or delayed delivery basis. 
(IF)    Inverse floating rate investment. 
(UB)    Underlying bond of an inverse floating rate trust reflected as a financing transaction pursuant to the 
    provisions of SFAS No. 140. 

Fair Value Measurements

During the current fiscal period, the Fund adopted the provisions of Statement of Financial Accounting Standards No. 157 (SFAS No. 157) “Fair Value Measurements.” SFAS No. 157 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosure about fair value measurements. In determining the value of the Fund’s investments various inputs are used. These inputs are summarized in the three broad levels listed below:

Level 1 – Quoted prices in active markets for identical securities. 
Level 2 – Other significant observable inputs (including quoted prices for similar securities, interest 
              rates, prepayment speeds, credit risk, etc.). 
Level 3 – Significant unobservable inputs (including management’s assumptions in determining 
              the fair value of investments). 

The inputs or methodology used for valuing securities are not an indication of the risk associated with investing in those securities.

The following is a summary of the Fund’s fair value measurements as of January 31, 2009:

    Level 1    Level 2    Level 3    Total 
Investments    $1,283,377    $633,568,686    $ —    $634,852,063 

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, timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate transactions subject to SFAS No. 140. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.

At January 31, 2009, the cost of investments was $626,697,874.

Gross unrealized appreciation and gross unrealized depreciation of investments at January 31, 2009, were as follows:

Gross unrealized:     
  Appreciation    $ 31,447,439 
  Depreciation    (37,434,567)
Net unrealized appreciation (depreciation) of investments    $  (5,987,128)

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: See 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 Insured Dividend Advantage Municipal Fund         

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

Date         April 1, 2009        

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         April 1, 2009        

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

Date        April 1, 2009