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:          07/31/05         

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)              
      July 31, 2005              
 
 
 
  Principal      Optional Call          Market 
  Amount (000)    Description(1)    Provisions*    Ratings**      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 Insured   5/12 at 101.00    AAA    $   5,718,764 
  3,045    Hoover, Alabama, General Obligation Bonds, Series 2003, 5.000%, 3/01/20 - MBIA Insured   3/12 at 101.00    AAA      3,253,978 
  10,000    Jefferson County, Alabama, Sewer Revenue Capital Improvement Warrants, Series 1999A, 5.375%,   2/09 at 101.00    AAA      10,825,400 
      2/01/36 (Pre-refunded to 2/01/09) - FGIC Insured              
      Alaska - 3.4% (2.3% of Total Investments)              
  15,000    Alaska, International Airport System Revenue Bonds, Series 2002B, 5.250%, 10/01/27 - AMBAC Insured   10/12 at 100.00    AAA      15,999,300 
      Arizona - 1.1% (0.8% of Total Investments)              
  5,000    Phoenix, Arizona, Civic Improvement Corporation, Senior Lien Airport Revenue Bonds, Series 2002B,   7/12 at 100.00    AAA      5,237,400 
      5.250%, 7/01/32 (Alternative Minimum Tax) - FGIC Insured              
      California - 11.4% (7.6% 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      1,579,283 
  1,565    5.000%, 10/01/27 - MBIA Insured   10/15 at 100.00    Aaa      1,663,032 
  8,890    California, General Obligation Veterans Welfare Bonds, Series 1997BH, 5.400%, 12/01/14   12/08 at 101.00    AA-      9,094,292 
      (Alternative Minimum Tax)              
  3,200    California, Various Purpose General Obligation Bonds, Series 2000, 5.250%, 9/01/17 - MBIA Insured   9/10 at 100.00    AAA      3,456,544 
  10,000    California, General Obligation Refunding Bonds, Series 2002, 5.000%, 2/01/23 - MBIA Insured   No Opt. Call    AAA      10,442,600 
  3,000    California, General Obligation Veterans Welfare Bonds, Series 2001BZ, 5.375%, 12/01/24   6/07 at 101.00    AAA      3,057,420 
      (Alternative Minimum Tax) - MBIA Insured              
  7,935    Los Angeles, California, Certificates of Participation, Real Property Acquisition Program, Series   4/12 at 100.00    AAA      8,443,554 
      2002, 5.300%, 4/01/32 - AMBAC Insured              
  1,000    Los Angeles Convention and Exhibition Center Authority, California, Certificates of Participation,   12/05 at 100.00    AAA      1,021,170 
      Series 1985, 9.000%, 12/01/20 (Pre-refunded to 12/01/05)              
  3,425    Los Angeles Unified School District, California, General Obligation Bonds, Series 2005A-1, 5.000%,   7/15 at 100.00    AAA      3,658,277 
      7/01/25 - FGIC Insured              
  7,500    Northern California Power Agency, Revenue Refunding Bonds, Hydroelectric Project 1, Series 1998A,   7/08 at 101.00    AAA      7,931,250 
      5.200%, 7/01/32 - MBIA Insured              
  2,320    Sacramento Municipal Utility District, California, Electric Revenue Bonds, Series 2001P, 5.250%,   8/11 at 100.00    AAA      2,524,276 
      8/15/18 - FSA Insured              
      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      1,740,496 
      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      1,188,108 
  1,170    5.000%, 12/01/14 - XLCA Insured   12/13 at 100.00    AAA      1,263,226 
      Florida - 16.1% (10.8% 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    AAA        2,522,016 
  1,480    5.250%, 12/01/18 - MBIA Insured   12/13 at 100.00    AAA      1,613,836 
 
  11,600    Greater Orlando Aviation Authority, Florida, Airport Facilities Revenue Bonds, Series 2002B,   10/12 at 100.00    AAA      12,136,500 
      5.125%, 10/01/21 (Alternative Minimum Tax) - FSA Insured              
 
  6,000    JEA, Florida, Water and Sewerage System Revenue Bonds, Series 2002A, 5.500%, 10/01/41 - MBIA   4/07 at 100.00    AAA      6,212,760 
      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      8,845,158 
      (Alternative Minimum Tax) - MBIA Insured              
 
  15,000    Miami-Dade County School Board, Florida, Certificates of Participation, Series 2003A, 5.000%,   No Opt. Call    AAA      15,729,150 
      8/01/27 (Mandatory put 8/01/08) - MBIA Insured              
 
      Miami-Dade County, Florida, Aviation Revenue Bonds, Miami International Airport, Series 2002:              
  7,165    5.625%, 10/01/15 (Alternative Minimum Tax) - FGIC Insured   10/12 at 100.00    AAA      7,886,659 
  5,600    5.750%, 10/01/16 (Alternative Minimum Tax) - FGIC Insured   10/12 at 100.00    AAA      6,207,320 
  10,000    5.125%, 10/01/21 (Alternative Minimum Tax) - FGIC Insured   10/12 at 100.00    AAA      10,475,000 
  2,000    5.250%, 10/01/22 (Alternative Minimum Tax) - FGIC Insured   10/12 at 100.00    AAA      2,112,920 
 
  1,000    Orange County, Florida, Sales Tax Revenue Bonds, Series 2002B, 5.000%, 1/01/25 - FGIC Insured   1/13 at 100.00    AAA      1,057,590 
 
      Georgia - 0.6% (0.3% of Total Investments)              
 
  1,000    Atlanta, Georgia, Water and Wastewater Revenue Bonds, Series 2004, 5.000%, 11/01/22 - FSA Insured   11/14 at 100.00    AAA      1,064,320 
 
  1,695    Georgia Housing and Finance Authority, Single Family Mortgage Bonds, Series 2002B-2, 5.500%,   12/11 at 100.00    AAA      1,763,292 
      6/01/32 (Alternative Minimum Tax)              
 
      Illinois - 14.0% (9.4% 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      10,783,400 
 
  5,000    Chicago, Illinois, General Obligation Refunding Bonds, Series 2001A, 5.500%, 1/01/38 - MBIA   1/11 at 101.00    AAA      5,469,000 
      Insured              
 
      Chicago, Illinois, Second Lien Passenger Facility Charge Revenue Bonds, O'Hare International              
      Airport, Series 2001C:              
  4,250    5.500%, 1/01/16 (Alternative Minimum Tax) - AMBAC Insured   1/11 at 101.00    AAA      4,593,230 
  4,485    5.500%, 1/01/17 (Alternative Minimum Tax) - AMBAC Insured   1/11 at 101.00    AAA      4,847,209 
  4,730    5.500%, 1/01/18 (Alternative Minimum Tax) - AMBAC Insured   1/11 at 101.00    AAA      5,102,629 
  2,930    5.500%, 1/01/19 (Alternative Minimum Tax) - AMBAC Insured   1/11 at 101.00    AAA      3,152,797 
 
  3,000    Chicago, Illinois, Third Lien General Airport Revenue Refunding Bonds, O'Hare International   1/12 at 100.00    AAA      3,286,650 
      Airport, Series 2002A, 5.750%, 1/01/17 (Alternative Minimum Tax) - MBIA Insured              
 
  12,765    Chicago, Illinois, Revenue Bonds, Skyway Toll Bridge, Series 1996, 5.500%, 1/01/23 (Pre-refunded   1/07 at 102.00    AAA      13,480,861 
      to 1/01/07) - MBIA Insured              
 
  4,000    Cicero, Cook County, Illinois, General Obligation Corporate Purpose Bonds, Series 2002, 5.000%,   12/12 at 101.00    AAA      4,243,160 
      12/01/21 - MBIA Insured              
 
  1,500    DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds, Series   10/13 at 100.00    Aaa      1,630,065 
      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      5,417,350 
      Insured              
 
  2,700    University of Illinois, Certificates of Participation, Utility Infrastructure Projects, Series   8/11 at 100.00    AAA      2,929,581 
      2001A, 5.000%, 8/15/20 (Pre-refunded to 8/15/11) - AMBAC Insured              
 
      Indiana - 16.9% (11.4% of Total Investments)              
 
  3,380    Evansville, Indiana, Sewerage Works Revenue Refunding Bonds, Series 2003A, 5.000%, 7/01/20 - AMBAC   7/13 at 100.00    AAA      3,597,064 
      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      2,710,075 
  7,075    5.250%, 4/01/26 - AMBAC Insured   4/12 at 100.00    AAA      7,596,569 
    7,000    5.250%, 4/01/30 - AMBAC Insured   4/12 at 100.00    AAA        7,516,040 
  10,000    Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Marion General Hospital,   7/12 at 100.00    AAA      10,547,900 
      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      26,791,250 
      5.250%, 7/01/33 - MBIA Insured (PLG)              
      New Albany-Floyd County School Building Corporation, Indiana, First Mortgage Bonds, Series 2002:              
  2,500    5.750%, 7/15/17 (Pre-refunded to 7/15/12) - FGIC Insured   7/12 at 100.00    AAA      2,840,350 
  3,810    5.750%, 7/15/20 (Pre-refunded to 7/15/12) - FGIC Insured   7/12 at 100.00    AAA      4,328,693 
      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      454,852 
  430    5.250%, 7/15/19 - FGIC Insured   7/12 at 100.00    AAA      466,640 
  1,675    5.400%, 7/15/23 - FGIC Insured   7/12 at 100.00    AAA      1,825,147 
  6,960    Valparaiso Middle School Building Corporation, Indiana, First Mortgage Refunding Bonds, Series   1/13 at 100.00    AAA      7,327,488 
      2002, 5.000%, 7/15/24 - MBIA Insured              
  2,490    Whitley County Middle School Building Corporation, Columbia City, Indiana, First Mortgage Bonds,   7/13 at 100.00    AAA      2,665,147 
      Series 2003, 5.000%, 1/15/18 - FSA Insured              
      Louisiana - 0.7% (0.5% of Total Investments)              
  3,085    New Orleans, Louisiana, General Obligation Refunding Bonds, Series 2002, 5.125%, 9/01/21 - MBIA   9/12 at 100.00    AAA      3,326,309 
      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      5,448,000 
      (Pre-refunded to 8/01/14) - AMBAC Insured              
  10,000    Massachusetts, Special Obligation Refunding Notes, Federal Highway Grant Anticipation Note Program,   No Opt. Call    Aaa      10,882,200 
      Series 2003A, 5.000%, 12/15/13 - FSA Insured              
      Michigan - 1.8% (1.2% of Total Investments)              
  7,500    Detroit, Michigan, Sewerage Disposal System Revenue Bonds, Series 1999A, 5.750%, 7/01/26   1/10 at 101.00    AAA      8,316,600 
      (Pre-refunded to 1/01/10) - FGIC Insured              
      Missouri - 2.4% (1.6% of Total Investments)              
  1,600    St. Louis County Pattonville School District R3, Missouri, General Obligation Bonds, Series 2004,   3/14 at 100.00    AAA      1,752,032 
      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      9,592,515 
      7/01/31 (Pre-refunded to 7/01/11) - MBIA Insured              
      Nebraska - 0.5% (0.2% of Total Investments)              
      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      1,094,270 
  1,000    5.250%, 4/01/21 - FSA Insured   4/13 at 100.00    AAA      1,092,880 
      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      10,431,365 
      MBIA Insured              
  8,750    Truckee Meadows Water Authority, Nevada, Water Revenue Bonds, Series 2001A, 5.250%, 7/01/34 - FSA   7/11 at 100.00    AAA      9,368,975 
      Insured              
      New Jersey - 0.5% (0.4% of Total Investments)              
  2,345    Bernards Township School District, Somerset County, New Jersey, General Obligation Bonds, Series   1/14 at 100.00    AAA      2,552,298 
      2004, 5.000%, 1/01/15 - FGIC Insured              
      New York - 2.9% (1.9% of Total Investments)              
    10,000    Metropolitan Transportation Authority, New York, Transportation Revenue Refunding Bonds, Series    11/12 at 100.00    AAA        10,462,400 
      2002A, 5.000%, 11/15/30 - FSA Insured                 
 
  1,500    Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series 2005B,    11/15 at 100.00    AAA        1,592,280 
      5.000%, 11/15/30 - AMBAC Insured                 
 
  1,120    Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Montefiore    2/15 at 100.00    AAA        1,192,789 
      Hospital, Series 2004, 5.000%, 8/01/23 - FGIC Insured                 
 
      North Carolina - 0.6% (0.4% of Total Investments)                 
 
  2,435    North Carolina Medical Care Commission, FHA-Insured Mortgage Revenue Bonds, Betsy Johnson Regional    10/13 at 100.00    AAA        2,687,729 
      Hospital Project, Series 2003, 5.375%, 10/01/24 - FSA Insured                 
 
      Oregon - 3.7% (2.5% of Total Investments)                 
 
  4,725    Clackamas County School District 62, Oregon City, Oregon, General Obligation Bonds, Series 2004,    6/14 at 100.00    AAA        5,162,441 
      5.000%, 6/15/15 - FSA Insured                 
 
      Oregon, General Obligation Veterans Welfare Bonds, Series 82:                 
  6,715    5.375%, 12/01/31    12/11 at 100.00    AA-        6,928,940 
  3,130    5.500%, 12/01/42    12/11 at 100.00    AA-        3,229,503 
 
  1,615    Oregon Department of Administrative Services, State Lottery Revenue Bonds, Series 2004A, 5.000%,    4/14 at 100.00    AAA        1,750,127 
      4/01/17 - FSA Insured                 
 
      Pennsylvania - 4.9% (3.3% of Total Investments)                 
 
  4,500    Allegheny County, Pennsylvania, Airport Revenue Refunding Bonds, Pittsburgh International Airport,    No Opt. Call    AAA        4,960,260 
      Series 1997A, 5.750%, 1/01/13 (Alternative Minimum Tax) - MBIA Insured                 
 
  5,000    Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, University of Pennsylvania,    7/08 at 100.00    AAA        5,290,450 
      Series 1998, 5.500%, 7/15/38 - MBIA Insured                 
 
  1,000    Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Lycoming College, Series    11/13 at 100.00    AA        1,073,270 
      2003-AA2, 5.250%, 11/01/16 - RAAI Insured                 
 
      Philadelphia, Pennsylvania, General Obligation Bonds, Series 2003A:                 
  3,090    5.250%, 2/15/14 - XLCA Insured    2/13 at 100.00    AAA        3,370,850 
  1,000    5.250%, 2/15/15 - XLCA Insured    2/13 at 100.00    AAA        1,085,440 
 
      Philadelphia Municipal Authority, Pennsylvania, Lease Revenue Bonds, Series 2003B:                 
  3,540    5.250%, 11/15/16 - FSA Insured    11/13 at 100.00    AAA        3,843,024 
  2,000    5.250%, 11/15/18 - FSA Insured    11/13 at 100.00    AAA        2,158,020 
 
  1,000    State Public School Building Authority, Pennsylvania, Lease Revenue Bonds, Philadelphia School    6/13 at 100.00    AAA        1,055,850 
      District, Series 2003, 5.000%, 6/01/23 - FSA Insured                 
 
      South Carolina - 0.8% (0.5% 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        1,119,220 
  2,300    5.000%, 4/01/21 - MBIA Insured    4/13 at 100.00    AAA        2,452,743 
 
      Tennessee - 9.2% (6.2% of Total Investments)                 
 
  10,000    Memphis-Shelby County Sports Authority, Tennessee, Revenue Bonds, Memphis Arena, Series 2002A,    11/12 at 100.00    AAA        10,565,000 
      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        10,558,600 
      5.125%, 11/01/29 - AMBAC Insured                 
 
      Memphis, Tennessee, Sanitary Sewerage System Revenue Bonds, Series 2004:                 
  1,495    5.000%, 10/01/19 - FSA Insured    10/14 at 100.00    AAA        1,612,926 
  1,455    5.000%, 10/01/20 - FSA Insured    10/14 at 100.00    AAA        1,565,143 
  1,955    5.000%, 10/01/21 - FSA Insured    10/14 at 100.00    AAA        2,096,777 
 
  15,195    Tennessee State School Bond Authority, Higher Educational Facilities Second Program Bonds, Series    5/12 at 100.00    AAA        16,307,730 
      2002A, 5.250%, 5/01/32 - FSA Insured                 
 
      Texas - 27.1% (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        3,837,190 
      Series 2001A, 5.750%, 11/01/13 (Alternative Minimum Tax) - FGIC Insured              
 
  10,000    Gainesville Hospital District, Texas, Limited Tax General Obligation Bonds, Series 2002, 5.375%,   8/11 at 100.00    AAA      10,557,900 
      8/15/32 - MBIA Insured              
 
  3,645    Galveston, Texas, General Obligation Refunding Bonds, Series 2001A, 5.250%, 5/01/21 - AMBAC   No Opt. Call    AAA      3,911,814 
      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      2,391,782 
  2,355    5.000%, 11/15/17 - MBIA Insured   11/13 at 100.00    AAA      2,504,307 
 
  13,000    Houston Area Water Corporation, Texas, Contract Revenue Bonds, Northeast Water Purification Plant,   3/12 at 100.00    AAA      13,563,030 
      Series 2002, 5.125%, 3/01/32 - FGIC Insured              
 
  2,500    Houston Higher Education Finance Corporation, Texas, Revenue Bonds, Rice University, Series 1999A,   11/09 at 101.00    AAA      2,684,225 
      5.375%, 11/15/29              
 
  1,000    Houston, Texas, First Lien Combined Utility System Revenue Bonds, Series 2004A, 5.250%, 5/15/24 -   5/14 at 100.00    AAA      1,080,680 
      FGIC Insured              
 
  4,345    San Antonio, Texas, Water System Senior Lien Revenue Refunding Bonds, Series 2002, 5.500%,   5/12 at 100.00    AAA      4,809,437 
      5/15/17 - FSA Insured              
 
  9,145    Texas, General Obligation Bonds, Veterans Housing Assistance Program Fund II, Series 2002A-1,   6/12 at 100.00    Aa1      9,629,594 
      5.250%, 12/01/22 (Alternative Minimum Tax)              
 
  6,110    Texas Department of Housing and Community Affairs, Residential Mortgage Revenue Bonds, Series   7/11 at 100.00    AAA      6,281,508 
      2001A, 5.350%, 7/01/33 (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      3,773,722 
  3,520    5.125%, 11/01/21 - MBIA Insured   5/12 at 100.00    Aaa      3,773,722 
 
  8,655    Texas Department of Housing and Community Affairs, Single Family Mortgage Bonds, Series 2002B,   3/12 at 100.00    AAA      9,003,191 
      5.550%, 9/01/33 (Alternative Minimum Tax) - MBIA Insured              
 
      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      10,171,364 
  11,665    5.500%, 1/01/33 - MBIA Insured   1/12 at 102.00    Aaa      12,859,379 
 
  5,000    Texas Water Development Board, Senior Lien State Revolving Fund Revenue Bonds, Series 1999B,   1/10 at 100.00    AAA      5,359,500 
      5.250%, 7/15/17              
 
      Williamson County, Texas, General Obligation Bonds, Series 2002:              
  3,500    5.200%, 2/15/21 - FSA Insured   2/12 at 100.00    AAA      3,760,085 
  3,000    5.250%, 2/15/22 - FSA Insured   2/12 at 100.00    AAA      3,237,270 
  7,340    5.250%, 2/15/23 - FSA Insured   2/12 at 100.00    AAA      7,920,521 
  5,000    5.250%, 2/15/25 - FSA Insured   2/12 at 100.00    AAA      5,344,800 
 
      Washington - 14.1% (9.4% of Total Investments)              
 
  7,675    Energy Northwest, Washington, Electric Revenue Refunding Bonds, Nuclear Project 1, Series 2002A,   7/12 at 100.00    AAA      8,479,570 
      5.500%, 7/01/15 - MBIA Insured              
 
  6,600    Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station -   7/12 at 100.00    AAA      7,198,488 
      Nuclear Project 2, Series 2002B, 5.350%, 7/01/18 - FSA Insured              
 
  2,200    King County School District 414, Lake Washington, Washington, General Obligation Bonds, Series   12/14 at 100.00    AAA      2,386,890 
      2004, 5.000%, 12/01/16 - FSA Insured              
 
  2,500    Port of Seattle, Washington, Revenue Refunding Bonds, Series 2002D, 5.750%, 11/01/15 (Alternative   11/12 at 100.00    AAA      2,773,825 
      Minimum Tax) - FGIC Insured              
 
  2,200    Snohomish County School District 2, Everett, Washington, General Obligation Bonds, Series 2003B,   12/13 at 100.00    AAA      2,370,742 
      5.000%, 6/01/17 - FSA Insured              
 
  3,255    Thurston and Pierce Counties School District, Washington, General Obligation Bonds, Yelm Community   6/13 at 100.00    Aaa      3,574,511 
      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        2,218,840
  4,325    5.125%, 6/01/22 - AMBAC Insured    6/12 at 100.00    Aaa      4,630,994
  15,000    Washington State Healthcare Facilities Authority, Revenue Bonds, Harrison Memorial Hospital, Series    8/13 at 102.00    AAA      15,778,800
      1998, 5.000%, 8/15/28 - AMBAC Insured             
  10,000    Washington State Healthcare Facilities Authority, Revenue Bonds, Children's Hospital and Regional    10/11 at 100.00    Aaa      10,393,000
      Medical Center, Series 2001, 5.125%, 10/01/31 - AMBAC Insured             
  5,170    Whitman County School District 267, Pullman, Washington, General Obligation Bonds, Series 2002,    6/12 at 100.00    Aaa      5,507,601
      5.000%, 12/01/20 - FSA Insured             
      Wisconsin - 3.2% (2.2% of Total Investments)             
  2,040    Wisconsin Housing and Economic Development Authority, Home Ownership Revenue Bonds, Series 2002E,    3/12 at 100.00    AA      2,111,624
      5.250%, 9/01/22 (Alternative Minimum Tax)             
  11,950    Wisconsin, Transportation Revenue Refunding Bonds, Series 2002-1, 5.125%, 7/01/18 - AMBAC Insured    7/12 at 100.00    AAA      12,962,160
$   647,070    Total Long-Term Investments (cost $649,237,633) - 148.9%              692,149,060
      Other Assets Less Liabilities - 1.2%              5,647,516
      Preferred Shares, at Liquidation Value - (50.1)%              (233,000,000)
      Net Assets Applicable to Common Shares - 100%            $   464,796,576

Forward Swaps outstanding at July 31, 2005:                       
                      Unrealized  
      Notional      Effective     Termination      Appreciation  
      Amount        Date(2)       Date      (Depreciation)  
 
Agreement with Morgan Stanley dated January 31, 2005, to pay                       
semi-annually the notional amount multiplied by 5.058% (annualized)                       
and receive quarterly the notional amount multiplied by the                       
three-month USD-LIBOR (United States Dollar-London                       
Inter-Bank Offered Rates).    $   7,500,000      8/16/05     8/16/35        $(110,661 ) 
 
                        $(110,661 ) 

    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) municipal bonds that are 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 otherweise noted. 
(2 )    Effective date reresents the date on which both the Fund and counterparty commence interest payment 
    accruals on each forward swap contract. 
*     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. 
**     Ratings: Using the higher of Standard & Poor's or Moody's rating. 
(PLG)     Portion of security with an aggregate market value of $165,034, has been pledged to collateralize the net 
    payment obligations under forward swap contracts. 
 
    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 income on taxable market 
    discount securities and timing differences in recognizing certain gains and losses on investment transactions. 
 
    At July 31, 2005, the cost of investments was $649,109,628. 
 
    Gross unrealized appreciation and gross unrealized depreciation of investments at July 31, 2005, were as 
    follows: 

                Gross unrealized:       
                Appreciation        $44,511,972  
                Depreciation      (1,472,540 ) 
 
                Net unrealized appreciation of investments        $43,039,432  

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--Vice President and Secretary        

Date         09/29/05        

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--Chief Administrative Officer (principal executive officer)        

Date         09/29/05        

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

Date         09/29/05        

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