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)


        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 Insured Dividend Advantage Municipal Fund (NVG)
January 31, 2006

        Optional         
Principal        Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Alabama – 4.3% (2.9% of Total Investments)             
$      5,310    Athens, Alabama, Water and Sewerage Revenue Warrants, Series 2002, 5.300%, 5/01/32 – MBIA    5/12 at 101.00    AAA   $   5,636,353 
     Insured             
3,045    Hoover, Alabama, General Obligation Bonds, Series 2003, 5.000%, 3/01/20 – MBIA Insured    3/12 at 101.00    AAA    3,226,878 
10,000    Jefferson County, Alabama, Sewer Revenue Capital Improvement Warrants, Series 1999A, 5.375%,    2/09 at 101.00    AAA    10,655,700 
     2/01/36 (Pre-refunded 2/01/09) – FGIC Insured             
18,355    Total Alabama            19,518,931 
    Alaska – 3.5% (2.3% of Total Investments)             
15,000    Alaska, International Airport System Revenue Bonds, Series 2002B, 5.250%, 10/01/27 – AMBAC    10/12 at 100.00    AAA    15,836,100 
     Insured             
    Arizona – 1.1% (0.8% of Total Investments)             
5,000    Phoenix, Arizona, Civic Improvement Corporation, Senior Lien Airport Revenue Bonds, Series    7/12 at 100.00    AAA    5,167,400 
     2002B, 5.250%, 7/01/32 – FGIC Insured (Alternative Minimum Tax)             
    California – 11.8% (7.9% of Total Investments)             
    California Educational Facilities Authority, Revenue Bonds, Occidental College, Series 2005A:             
1,485     5.000%, 10/01/26 – MBIA Insured    10/15 at 100.00    Aaa    1,567,031 
1,565     5.000%, 10/01/27 – MBIA Insured    10/15 at 100.00    Aaa    1,648,915 
190    California, General Obligation Bonds, Series 2000, 5.250%, 9/01/18 – MBIA Insured    9/10 at 100.00    AAA    203,089 
    California, General Obligation Bonds, Series 2000:             
375     5.250%, 9/01/17 (Pre-refunded 9/01/10) – MBIA Insured    9/10 at 100.00    AAA    403,346 
2,635     5.250%, 9/01/18 (Pre-refunded 9/01/10) – MBIA Insured    9/10 at 100.00    AAA    2,823,771 
10,000    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/23 – MBIA Insured    No Opt. Call    AAA    10,417,700 
8,890    California, General Obligation Veterans Welfare Bonds, Series 1997BH, 5.400%, 12/01/14    12/08 at 101.00    AA-    9,245,067 
     (Alternative Minimum Tax)             
3,000    California, General Obligation Veterans Welfare Bonds, Series 2001BZ, 5.375%, 12/01/24 – MBIA    6/07 at 101.00    AAA    3,047,040 
     Insured (Alternative Minimum Tax)             
2,425    Fullerton Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2005,    9/15 at 100.00    AAA    2,534,780 
     5.000%, 9/01/27 – AMBAC Insured             
3,425    Los Angeles Unified School District, California, General Obligation Bonds, Series 2005A-1,    7/15 at 100.00    AAA    3,615,704 
     5.000%, 7/01/25 – FGIC Insured             
7,935    Los Angeles, California, Certificates of Participation, Series 2002, 5.300%, 4/01/32 – AMBAC    4/12 at 100.00    AAA    8,341,510 
     Insured             
7,500    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series    7/08 at 101.00    AAA    7,826,925 
     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    2,503,999 
     5.250%, 8/15/18 – FSA Insured             
51,745    Total California            54,178,877 
    Colorado – 0.9% (0.6% of Total Investments)             
1,580    Gunnison Watershed School District RE1J, Gunnison and Saguache Counties, Colorado, General    No Opt. Call    Aaa    1,723,164 
     Obligation Bonds, Series 2004, 5.000%, 12/01/15 – FSA Insured             
    Sand Creek Metropolitan District, Colorado, General Obligation Bonds, Series 2004:             
1,095     5.000%, 12/01/13 – XLCA Insured    No Opt. Call    AAA    1,174,048 
1,170     5.000%, 12/01/14 – XLCA Insured    12/13 at 100.00    AAA    1,250,227 
3,845    Total Colorado            4,147,439 
    Florida – 13.0% (8.7% 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    AAA    2,507,494 
1,480     5.250%, 12/01/18 – MBIA Insured    12/13 at 100.00    AAA    1,608,153 
11,600    Greater Orlando Aviation Authority, Florida, Airport Facilities Revenue Bonds, Series 2002B,    10/12 at 100.00    AAA    12,035,812 
     5.125%, 10/01/21 – FSA Insured (Alternative Minimum Tax)             
6,000    JEA, Florida, Water and Sewerage System Revenue Bonds, Series 2002A, 5.500%, 10/01/41 – MBIA    4/07 at 100.00    AAA    6,129,840 
     Insured             
8,155    Lee County, Florida, Solid Waste System Revenue Refunding Bonds, Series 2001, 5.625%, 10/01/13    10/11 at 100.00    Aaa    8,739,387 
     – 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    AAA    7,757,187 
5,600     5.750%, 10/01/16 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AAA    6,101,480 
10,000     5.125%, 10/01/21 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AAA    10,387,400 
2,000     5.250%, 10/01/22 – FGIC Insured (Alternative Minimum Tax)    10/12 at 100.00    AAA    2,094,240 
1,000    Orange County, Florida, Sales Tax Revenue Bonds, Series 2002B, 5.000%, 1/01/25 – FGIC Insured    1/13 at 100.00    AAA    1,053,940 
1,000    Tallahassee, Florida, Energy System Revenue Bonds, Series 2005, 5.000%, 10/01/28 (WI/DD,    10/15 at 100.00    AAA    1,047,170 
     Settling 2/01/06) – MBIA Insured             
56,305    Total Florida            59,462,103 
    Georgia – 2.2% (1.5% of Total Investments)             
6,925    Atlanta and Fulton County Recreation Authority, Georgia, Guaranteed Revenue Bonds, Park    12/15 at 100.00    AAA    7,256,154 
     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 – FSA    11/14 at 100.00    AAA    1,055,390 
     Insured             
1,695    Georgia Housing and Finance Authority, Single Family Mortgage Bonds, Series 2002B-2, 5.500%,    12/11 at 100.00    AAA    1,747,240 
     6/01/32 (Alternative Minimum Tax)             
9,620    Total Georgia            10,058,784 
    Illinois – 14.8% (10.0% of Total Investments)             
10,000    Bolingbrook, Illinois, General Obligation Bonds, Series 2002A, 5.375%, 1/01/38 – FGIC Insured    1/12 at 100.00    AAA    10,679,700 
4,950    Chicago, Illinois, General Obligation Bonds, Series 2001A, 5.500%, 1/01/38 – MBIA Insured    1/11 at 101.00    AAA    5,317,835 
50    Chicago, Illinois, General Obligation Bonds, Series 2001A, 5.500%, 1/01/38 (Pre-refunded    1/11 at 101.00    AAA    54,794 
     1/01/11) – MBIA Insured             
12,765    Chicago, Illinois, Revenue Bonds, Skyway Toll Bridge, Series 1996, 5.500%, 1/01/23    1/07 at 102.00    AAA    13,272,792 
     (Pre-refunded 1/01/07) – MBIA Insured             
    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    AAA    4,537,003 
4,485     5.500%, 1/01/17 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    AAA    4,787,872 
4,730     5.500%, 1/01/18 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    AAA    5,049,417 
2,930     5.500%, 1/01/19 – AMBAC Insured (Alternative Minimum Tax)    1/11 at 101.00    AAA    3,120,186 
3,600    Chicago, Illinois, Third Lien General Airport Revenue Bonds, O’Hare International Airport,    1/16 at 100.00    AAA    3,887,208 
     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    AAA    3,242,070 
     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    AAA    4,216,960 
     5.000%, 12/01/21 – MBIA Insured             
1,500    DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,    10/13 at 100.00    Aaa    1,618,245 
     Series 2003C, 5.250%, 10/01/22 – FSA Insured             
5,000    Illinois, General Obligation Bonds, Illinois FIRST Program, Series 2002, 5.250%, 4/01/23 – FSA    4/12 at 100.00    AAA    5,365,150 
     Insured             
2,700    University of Illinois, Certificates of Participation, Utility Infrastructure Projects, Series    8/11 at 100.00    AAA    2,893,158 
     2001A, 5.000%, 8/15/20 (Pre-refunded 8/15/11) – AMBAC Insured             
63,960    Total Illinois            68,042,390 
    Indiana – 17.2% (11.5% of Total Investments)             
3,380    Evansville, Indiana, Sewerage Works Revenue Refunding Bonds, Series 2003A, 5.000%, 7/01/20 -    7/13 at 100.00    AAA    3,566,982 
     AMBAC Insured             
    Indiana Bond Bank, Special Program Bonds, Hendricks County Redevelopment District, Series             
    2002D:             
2,500     5.375%, 4/01/23 – AMBAC Insured    4/12 at 100.00    AAA    2,682,550 
7,075     5.250%, 4/01/26 – AMBAC Insured    4/12 at 100.00    AAA    7,535,017 
7,000     5.250%, 4/01/30 – AMBAC Insured    4/12 at 100.00    AAA    7,434,280 
10,000    Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Marion General Hospital,    7/12 at 100.00    AAA    10,399,500 
     Series 2002, 5.250%, 7/01/32 – AMBAC Insured             
25,000    Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,    7/12 at 100.00    AAA    27,351,500 
     5.250%, 7/01/33 (Pre-refunded 7/01/12) – MBIA Insured             
    New Albany-Floyd County School Building Corporation, Indiana, First Mortgage Bonds, Series             
    2002:             
2,500     5.750%, 7/15/17 (Pre-refunded 7/15/12) – FGIC Insured    7/12 at 100.00    AAA    2,807,575 
3,810     5.750%, 7/15/20 (Pre-refunded 7/15/12) – FGIC Insured    7/12 at 100.00    AAA    4,278,744 
    Northern Wells Community School Building Corporation, Wells County, Indiana, First Mortgage             
    Bonds, Series 2001:             
420     5.250%, 1/15/19 – FGIC Insured    7/12 at 100.00    AAA    450,715 
430     5.250%, 7/15/19 – FGIC Insured    7/12 at 100.00    AAA    461,446 
1,675     5.400%, 7/15/23 – FGIC Insured    7/12 at 100.00    AAA    1,804,159 
6,960    Valparaiso Middle School Building Corporation, Indiana, First Mortgage Refunding Bonds, Series    1/13 at 100.00    AAA    7,294,428 
     2002, 5.000%, 7/15/24 – MBIA Insured             
2,490    Whitley County Middle School Building Corporation, Columbia City, Indiana, First Mortgage    7/13 at 100.00    AAA    2,643,509 
     Bonds, Series 2003, 5.000%, 1/15/18 – FSA Insured             
73,240    Total Indiana            78,710,405 
    Louisiana – 0.7% (0.5% of Total Investments)             
3,085    New Orleans, Louisiana, General Obligation Refunding Bonds, Series 2002, 5.125%, 9/01/21 –    9/12 at 100.00    AAA    3,212,966 
     MBIA Insured             
    Massachusetts – 3.5% (2.4% of Total Investments)             
5,000    Massachusetts, General Obligation Bonds, Consolidated Loan, Series 2004B, 5.000%, 8/01/22    8/14 at 100.00    AAA    5,387,900 
     (Pre-refunded 8/01/14) – AMBAC Insured             
10,000    Massachusetts, Special Obligation Refunding Notes, Federal Highway Grant Anticipation Note    No Opt. Call    Aaa    10,751,700 
     Program, Series 2003A, 5.000%, 12/15/13 – FSA Insured             
15,000    Total Massachusetts            16,139,600 
    Missouri – 2.4% (1.6% of Total Investments)             
1,600    St. Louis County Pattonville School District R3, Missouri, General Obligation Bonds, Series    3/14 at 100.00    AAA    1,748,944 
     2004, 5.250%, 3/01/19 – FSA Insured             
8,735    St. Louis, Missouri, Airport Revenue Bonds, Airport Development Program, Series 2001A, 5.250%,    7/11 at 100.00    AAA    9,467,342 
     7/01/31 (Pre-refunded 7/01/11) – MBIA Insured             
10,335    Total Missouri            11,216,286 
    Nebraska – 1.9% (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    6,612,619 
    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    1,082,670 
1,000     5.250%, 4/01/21 – FSA Insured    4/13 at 100.00    AAA    1,075,870 
8,360    Total Nebraska            8,771,159 
    Nevada – 4.3% (2.9% of Total Investments)             
9,810    Clark County School District, Nevada, General Obligation Bonds, Series 2002C, 5.000%, 6/15/21    6/12 at 100.00    AAA    10,361,126 
     – MBIA Insured             
8,750    Truckee Meadows Water Authority, Nevada, Water Revenue Bonds, Series 2001A, 5.250%, 7/01/34 –    7/11 at 100.00    AAA    9,197,562 
     FSA Insured             
18,560    Total Nevada            19,558,688 
    New Jersey – 0.6% (0.4% of Total Investments)             
2,345    Bernards Township School District, Somerset County, New Jersey, General Obligation Bonds,    1/14 at 100.00    AAA    2,528,285 
     Series 2004, 5.000%, 1/01/15 – FGIC Insured             
    New York – 2.9% (1.9% of Total Investments)             
1,120    Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Montefiore    2/15 at 100.00    AAA    1,181,846 
     Hospital, Series 2004, 5.000%, 8/01/23 – FGIC Insured             
1,500    Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series 2005B,    11/15 at 100.00    AAA    1,571,475 
     5.000%, 11/15/30 – AMBAC Insured             
10,000    Metropolitan Transportation Authority, New York, Transportation Revenue Refunding Bonds,    11/12 at 100.00    AAA    10,339,300 
     Series 2002A, 5.000%, 11/15/30 – FSA Insured             
12,620    Total New York            13,092,621 
    North Carolina – 0.6% (0.4% of Total Investments)             
2,435    North Carolina Medical Care Commission, FHA-Insured Mortgage Revenue Bonds, Betsy Johnson    10/13 at 100.00    AAA    2,647,356 
     Regional Hospital Project, Series 2003, 5.375%, 10/01/24 – FSA Insured             
    Oregon – 3.4% (2.3% of Total Investments)             
4,725    Clackamas County School District 62, Oregon City, Oregon, General Obligation Bonds, Series    6/14 at 100.00    AAA    5,109,473 
     2004, 5.000%, 6/15/15 – FSA Insured             
1,615    Oregon Department of Administrative Services, State Lottery Revenue Bonds, Series 2004A,    4/14 at 100.00    AAA    1,734,639 
     5.000%, 4/01/17 – FSA Insured             
    Oregon, General Obligation Veterans Welfare Bonds, Series 82:             
5,900     5.375%, 12/01/31    12/11 at 100.00    AA-    6,053,813 
2,750     5.500%, 12/01/42    12/11 at 100.00    AA-    2,821,555 
14,990    Total Oregon            15,719,480 
    Pennsylvania – 5.4% (3.6% of Total Investments)             
4,500    Allegheny County, Pennsylvania, Airport Revenue Refunding Bonds, Pittsburgh International    No Opt. Call    AAA    4,871,250 
     Airport, Series 1997A, 5.750%, 1/01/13 – MBIA Insured (Alternative Minimum Tax)             
1,000    Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Lycoming College, Series    11/13 at 100.00    AA    1,064,020 
     2003-AA2, 5.250%, 11/01/16 – RAAI Insured             
5,000    Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, University of    7/08 at 100.00    AAA    5,248,300 
     Pennsylvania, Series 1998, 5.500%, 7/15/38 (Pre-refunded 7/15/08) – MBIA Insured             
    Philadelphia Municipal Authority, Pennsylvania, Lease Revenue Bonds, Series 2003B:             
3,540     5.250%, 11/15/16 – FSA Insured    11/13 at 100.00    AAA    3,798,880 
2,000     5.250%, 11/15/18 – FSA Insured    11/13 at 100.00    AAA    2,140,200 
    Philadelphia, Pennsylvania, General Obligation Bonds, Series 2003A:             
3,090     5.250%, 2/15/14 – XLCA Insured    2/13 at 100.00    AAA    3,334,697 
1,000     5.250%, 2/15/15 – XLCA Insured    2/13 at 100.00    AAA    1,075,370 
2,000    Reading School District, Berks County, Pennsylvania, General Obligation Bonds, Series 2005,    1/16 at 100.00    AAA    2,150,120 
     5.000%, 1/15/19 – FSA Insured             
1,000    State Public School Building Authority, Pennsylvania, Lease Revenue Bonds, Philadelphia School    6/13 at 100.00    AAA    1,051,080 
     District, Series 2003, 5.000%, 6/01/23 – FSA Insured             
23,130    Total Pennsylvania            24,733,917 
    Puerto Rico – 0.2% (0.1% of Total Investments)             
1,225    Puerto Rico Municipal Finance Agency, Series 2005C, 5.250%, 8/01/21 – CIFG Insured    No Opt. Call    AAA    1,369,709 
    South Carolina – 1.0% (0.7% of Total Investments)             
    Greenville, South Carolina, Tax Increment Revenue Improvement Bonds, Series 2003:             
1,000     5.500%, 4/01/17 – MBIA Insured    4/13 at 100.00    AAA    1,102,100 
2,300     5.000%, 4/01/21 – MBIA Insured    4/13 at 100.00    AAA    2,428,179 
1,000    Scago Educational Facilities Corporation, South Carolina, Installment Purchase Revenue Bonds,    10/15 at 100.00    AAA    1,058,480 
     Spartanburg County School District 5, Series 2005, 5.000%, 4/01/21 – FSA Insured             
4,300    Total South Carolina            4,588,759 
    Tennessee – 9.2% (6.2% 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    1,598,424 
1,455     5.000%, 10/01/20 – FSA Insured    10/14 at 100.00    AAA    1,552,369 
1,955     5.000%, 10/01/21 – FSA Insured    10/14 at 100.00    AAA    2,078,478 
10,000    Memphis-Shelby County Sports Authority, Tennessee, Revenue Bonds, Memphis Arena, Series 2002A,    11/12 at 100.00    AAA    10,454,400 
     5.125%, 11/01/28 – AMBAC Insured             
10,000    Memphis-Shelby County Sports Authority, Tennessee, Revenue Bonds, Memphis Arena, Series 2002B,    11/12 at 100.00    AAA    10,441,900 
     5.125%, 11/01/29 – AMBAC Insured             
15,195    Tennessee State School Bond Authority, Higher Educational Facilities Second Program Bonds,    5/12 at 100.00    AAA    16,061,267 
     Series 2002A, 5.250%, 5/01/32 – FSA Insured             
40,100    Total Tennessee            42,186,838 
    Texas – 27.3% (18.3% of Total Investments)             
3,500    Dallas-Ft. Worth International Airport, Texas, Joint Revenue Refunding and Improvement Bonds,    11/11 at 100.00    AAA    3,796,100 
     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    AAA    10,410,100 
     5.375%, 8/15/32 – MBIA Insured             
1,210    Galveston, Texas, General Obligation Bonds, Series 2001, 5.250%, 5/01/21 – AMBAC Insured    5/11 at 100.00    AAA    1,284,258 
2,435    Galveston, Texas, General Obligation Bonds, Series 2001, 5.250%, 5/01/21 (Pre-refunded    5/11 at 100.00    AAA    2,630,579 
     5/01/11) – AMBAC Insured             
    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    AAA    2,367,008 
2,355     5.000%, 11/15/17 – MBIA Insured    11/13 at 100.00    AAA    2,482,099 
13,000    Houston Area Water Corporation, Texas, Contract Revenue Bonds, Northeast Water Purification    3/12 at 100.00    AAA    13,413,790 
     Plant, Series 2002, 5.125%, 3/01/32 – FGIC Insured             
2,500    Houston Higher Education Finance Corporation, Texas, Revenue Bonds, Rice University, Series    11/09 at 101.00    AAA    2,649,625 
     1999A, 5.375%, 11/15/29             
1,000    Houston, Texas, First Lien Combined Utility System Revenue Bonds, Series 2004A, 5.250%,    5/14 at 100.00    AAA    1,069,540 
     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    4,740,525 
     5/15/17 – FSA Insured             
6,000    Texas Department of Housing and Community Affairs, Residential Mortgage Revenue Bonds, Series    7/11 at 100.00    AAA    6,241,020 
     2001A, 5.350%, 7/01/33 (Alternative Minimum Tax)             
8,635    Texas Department of Housing and Community Affairs, Single Family Mortgage Bonds, Series 2002B,    3/12 at 100.00    AAA    8,895,173 
     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    Aaa    3,757,917 
3,520     5.125%, 11/01/21 – MBIA Insured    5/12 at 100.00    Aaa    3,735,459 
    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    Aaa    10,122,014 
11,665     5.500%, 1/01/33 – MBIA Insured    1/12 at 102.00    Aaa    12,681,021 
5,000    Texas Water Development Board, Senior Lien State Revolving Fund Revenue Bonds, Series 1999B,    1/10 at 100.00    AAA    5,277,750 
     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    9,567,499 
     5.250%, 12/01/22 (Alternative Minimum Tax)             
    Williamson County, Texas, General Obligation Bonds, Series 2002:             
3,500     5.200%, 2/15/21 – FSA Insured    2/12 at 100.00    AAA    3,724,840 
3,000     5.250%, 2/15/22 – FSA Insured    2/12 at 100.00    AAA    3,207,330 
7,340     5.250%, 2/15/23 – FSA Insured    2/12 at 100.00    AAA    7,847,267 
5,000     5.250%, 2/15/25 – FSA Insured    2/12 at 100.00    AAA    5,314,650 
118,310    Total Texas            125,215,564 
    Washington – 13.6% (9.1% of Total Investments)             
6,600    Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station –    7/12 at 100.00    AAA    7,112,424 
     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    8,368,206 
     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    AAA    2,726,300 
     Insured (Alternative Minimum Tax)             
2,200    Snohomish County School District 2, Everett, Washington, General Obligation Bonds, Series    12/13 at 100.00    AAA    2,348,566 
     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    Aaa    3,553,125 
     Community Schools, Series 2003, 5.250%, 12/01/16 – FSA 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    Aaa    2,185,560 
4,325     5.125%, 6/01/22 – AMBAC Insured    6/12 at 100.00    Aaa    4,597,605 
10,000    Washington State Healthcare Facilities Authority, Revenue Bonds, Children’s Hospital and    10/11 at 100.00    Aaa    10,248,600 
     Regional Medical Center, Series 2001, 5.125%, 10/01/31 – AMBAC Insured             
15,000    Washington State Healthcare Facilities Authority, Revenue Bonds, Harrison Memorial Hospital,    8/13 at 102.00    AAA    15,522,000 
     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    Aaa    5,483,457 
     2002, 5.000%, 12/01/20 – FSA Insured             
58,725    Total Washington            62,145,843 
    Wisconsin – 3.0% (2.0% of Total Investments)             
920    Wisconsin Housing and Economic Development Authority, Home Ownership Revenue Bonds, Series    3/12 at 100.00    AA    947,692 
     2002E, 5.250%, 9/01/22 (Alternative Minimum Tax)             
11,950    Wisconsin, Transportation Revenue Refunding Bonds, Series 2002-1, 5.125%, 7/01/18 – AMBAC    7/12 at 100.00    AAA    12,805,024 
     Insured             
12,870    Total Wisconsin            13,752,716 
$ 643,460    Total Long-Term Investments (cost $643,516,582) – 148.8%            682,002,216 
    Short-Term Investments – 0.1% (0.1% of Total Investments)             
600    Idaho Health Facilities Authority, Revenue Bonds, St. Luke’s Regional Medical Center, Variable    No Opt. Call    A–1+    600,000 
     Rate Demand Obligations, Series 2000, 3.020%, 7/01/30 – FSA Insured (4)             
$        600    Total Short-Term Investments (cost $600,000)            600,000 
    Total Investments (cost $644,116,582) – 148.9%            682,602,216 
    Other Assets Less Liabilities – 1.9%            8,692,184 
    Preferred Shares, at Liquidation Value – (50.8)%            (233,000,000) 
    Net Assets Applicable to Common Shares – 100%           $   458,294,400 

    At least 80% of the Fund’s net assets (including net assets attributable to Preferred shares) are 
    invested in municipal securities that are either covered by Original Issue Insurance, Secondary 
    Market Insurance or Portfolio Insurance which ensures the timely payment of principal and interest. 
    Up to 20% of the Fund’s net assets (including net assets attributable to Preferred shares) may be 
    invested in municipal securities that are (i) either backed by an escrow or trust containing sufficient 
    U.S. Government or U.S. Government agency securities (also ensuring the timely payment of principal 
    and interest), or (ii) rated, at the time of investment, within the four highest grades (Baa or BBB or 
    better by Moody’s, S&P or Fitch) or unrated but judged to be of comparable quality by the Adviser. 
(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 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. 
(4)    Security 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. 
WI/DD    Investment purchased on a when-issued or delayed delivery basis. 

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 $646,408,523.

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

Gross unrealized:   
  Appreciation  $38,987,851 
  Depreciation  (2,794,158) 
Net unrealized appreciation (depreciation) of investments  $36,193,693 

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 Insured Dividend Advantage Municipal Fund        

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.