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UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-07354

Name of Fund: BlackRock Investment Quality Municipal Trust, Inc. (BKN)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
Investment Quality Municipal Trust, Inc., 55 East 52nd Street, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 04/30/2010

Date of reporting period: 01/31/2010

Item 1 – Schedule of Investments

Schedule of Investments January 31, 2010 (Unaudited)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
Alabama — 3.0%     
Birmingham Special Care Facilities     
   Financing Authority, RB, Children's     
   Hospital (AGC), 6.00%, 6/01/34  $ 1,745  $ 1,860,397 
Birmingham Special Care Facilities     
   Financing Authority, RB, Children's     
   Hospital (AGC), 6.00%, 6/01/39  1,100  1,166,528 
Coosa Valley Water Supply District Inc.,     
   RB (AGC), 4.50%, 10/01/34  900  885,447 
Coosa Valley Water Supply District Inc.,     
   RB (AGC), 4.50%, 10/01/36  1,645  1,607,412 
Coosa Valley Water Supply District Inc.,     
   RB (AGC), 4.50%, 10/01/39  1,200  1,158,012 
    6,677,796 
Arizona — 5.9%     
City of Goodyear Arizona, GO, City of     
   Goodyear Arizona, GO (AGM),     
 4.25%, 7/01/36  1,125  1,039,207 
Glendale Municipal Property Corp.     
   Arizona, Refunding RB, Series A     
   (AGM), 4.50%, 7/01/32  350  348,519 
Mohave County Unified School District     
   No. 20 Kingman, GO, School     
   Improvement Project of 2006,     
 Series C (AGC), 5.00%, 7/01/26  1,800  1,913,922 
Pima County IDA, Refunding IDRB,     
   Tucson Electric Power,     
 5.75%, 9/01/29  1,375  1,389,094 
Salt Verde Financial Corp., RB, Senior,     
   5.00%, 12/01/32  1,035  909,465 
Salt Verde Financial Corp., RB, Senior,     
   5.00%, 12/01/37  4,585  3,902,202 
San Luis Facility Development Corp.,     
   RB, Senior Lien, Regional Detention     
   Center Project, 6.25%, 5/01/15  490  456,288 
San Luis Facility Development Corp.,     
   RB, Senior Lien, Regional Detention     
   Center Project, 7.00%, 5/01/20  490  453,809 
San Luis Facility Development Corp.,     
   RB, Senior Lien, Regional Detention     
   Center Project, 7.25%, 5/01/27  980  896,083 

  Par   
Municipal Bonds  (000)  Value 
Arizona (concluded)     
State of Arizona, COP, Department of     
   Administration, Series A (AGM),     
   5.00%, 10/01/29  $ 1,100  $ 1,110,857 
University Medical Center Corp. Arizona,     
   RB, 6.50%, 7/01/39  750  793,230 
    13,212,676 
California — 25.2%     
California County Tobacco Securitization     
   Agency, RB, CAB, Stanislaus,     
 Sub-Series C, 6.30%, 6/01/55 (a)  7,090  87,562 
California State Department of Veterans     
   Affairs, RB, Series B, AMT,     
 5.25%, 12/01/37  5,000  4,439,750 
Carlsbad Unified School District, GO,     
   Election, Series B,     
 6.09%, 5/01/34 (b)  1,500  923,730 
County of Sacramento California, RB,     
   Senior Series A (AGM),     
 5.00%, 7/01/41  2,000  1,938,320 
Dinuba Unified School District, GO,     
   Election 2006 (AGM),     
 5.63%, 8/01/31  250  261,515 
Dinuba Unified School District, GO,     
   Election 2006 (AGM),     
 5.75%, 8/01/33  535  558,069 
Foothill Eastern Transportation Corridor     
   Agency California, Refunding RB,     
   5.75%, 1/15/40  3,495  3,289,599 
Foothill Eastern Transportation Corridor     
   Agency California, Refunding RB, CAB,     
   5.88%, 7/15/28  7,000  6,762,700 
Golden State Tobacco Securitization     
   Corp. California, Refunding RB,     
   Asset-Backed, Senior Series A-1,     
 5.13%, 6/01/47  805  553,164 
Hartnell Community College District     
   California, GO, CAB, Election of 2002,     
   Series D, 7.26%, 8/01/34 (a)  2,475  1,196,390 
Los Altos Elementary School District,     
   GO, CAB, Election 1998, Series B,     
   (NPFGC), 5.93%, 8/01/13 (a)(c)  10,945  5,589,830 

Portfolio Abbreviations

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated
according to the following listing:

AGC  Assured Guaranty Corp.  GO  General Obligation Bonds 
AGM  Assured Guaranty Municipal Corp.  IDA  Industrial Development Authority 
AMBAC  American Municipal Bond Assurance Corp.  IDRB  Industrial Development Revenue Bonds 
AMT  Alternative Minimum Tax (subject to)  NPFGC  National Public Finance Guarantee Corp. 
CAB  Capital Appreciation Bonds  PILOT  Payment in Lieu of Taxes 
CIFG  CDC IXIS Financial Guaranty  RAN  Revenue Anticipation Notes 
COP  Certificates of Participation  RB  Revenue Bonds 
EDA  Economic Development Authority     
FGIC  Financial Guaranty Insurance Co.     
GAN  Grant Anticipation Notes     

BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010 1

Schedule of Investments (continued)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
California (concluded)       
Norwalk-La Mirada Unified School       
   District California, GO, Refunding,       
   CAB, Election 2002, Series E (AGC),       
   6.47%, 8/01/38 (a)  $ 12,000  $ 1,895,400 
San Diego Community College District       
   California, GO, CAB, Election 2002,       
   6.17%, 8/01/19 (b)    4,200  2,579,850 
State of California, GO, Refunding,       
   5.00%, 2/01/32    5,340  4,868,318 
State of California, GO, Refunding (CIFG),     
   4.50%, 8/01/28    3,000  2,632,200 
State of California, GO, Various Purpose,     
   5.75%, 4/01/31    3,000  3,014,580 
State of California, GO, Various Purpose,     
   5.00%, 6/01/32    4,545  4,140,177 
State of California, GO, Various Purpose,     
   5.00%, 6/01/32    4,545  4,140,177 
State of California, GO, Various Purpose,     
   6.50%, 4/01/33    2,900  3,097,809 
State of California, GO, Various Purpose     
   (CIFG), 5.00%, 3/01/33    5,000  4,523,750 
University of California, RB, Limited       
   Project, Series B, 4.75%, 5/15/38    4,185  3,924,902 
      56,277,615 
Colorado — 0.5%       
City of Colorado Springs Colorado, RB,       
   Subordinate Lien, Improvement,       
   Series C (AGM), 5.00%, 11/15/45    1,030  1,043,874 
District of Columbia — 2.2%       
District of Columbia Tobacco Settlement     
   Financing Corp., Refunding RB,       
 Asset-Backed, 6.50%, 5/15/33    4,960  4,900,778 
Florida — 12.3%       
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.20%, 10/01/32 (a)    4,225  910,741 
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.21%, 10/01/33 (a)    4,000  793,200 
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.21%, 10/01/34 (a)    4,580  842,170 
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.22%, 10/01/35 (a)    5,000  854,800 
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.23%, 10/01/36 (a)    10,000  1,581,200 
County of Miami-Dade Florida, RB, CAB,     
   Sub-Series A (NPFGC),       
 5.24%, 10/01/37 (a)    10,000  1,464,900 
County of Orange Florida, Refunding RB,     
   (Syncora), 4.75%, 10/01/32    5,000  4,884,300 
Fishhawk Community Development       
   District II, Special Assessment Bonds,     
   Series A, 6.13%, 5/01/34    1,990  1,775,159 

  Par   
Municipal Bonds  (000)  Value 
Florida (concluded)     
Hillsborough County IDA, RB, National     
   Gypsum Co., Series A, AMT,     
 7.13%, 4/01/30  $ 3,700  $ 2,849,111 
Miami Beach Health Facilities Authority,     
   RB, Mount Sinai Medical Center of     
   Florida, 6.75%, 11/15/21  1,960  1,977,895 
Sumter Landing Community     
   Development District Florida, RB,     
   Sub-Series B, 5.70%, 10/01/38  3,635  2,738,573 
Village Community Development District     
   No. 6, Special Assessment Bonds,     
   5.63%, 5/01/22  7,205  6,746,474 
    27,418,523 
Georgia — 3.1%     
City of Atlanta Georgia, RB (AGM),     
   5.00%, 11/01/34  1,500  1,506,810 
Gainesville & Hall County Hospital     
   Authority, RB, Northeast Georgia     
   Healthcare, Series B,     
 5.00%, 2/15/33 (d)  3,000  2,880,990 
Gwinnett County Hospital Authority, RB,     
   Gwinnett Hospital System, Series C     
   (AGM), 5.50%, 7/01/42  650  657,592 
Milledgeville & Baldwin County     
   Development Authority, RB, Georgia     
   College & State University     
   Foundation, 6.00%, 9/01/14 (c)  1,500  1,810,665 
    6,856,057 
Hawaii — 1.1%     
Hawaii State Department of Budget &     
   Finance, Refunding RB, Hawaiian     
   Electric Co. Inc., Series D, AMT     
   (AMBAC), 6.15%, 1/01/20  2,500  2,503,325 
Idaho — 1.6%     
Idaho Health Facilities Authority,     
   Refunding RB, Trinity Health Group,     
   Series B, 6.25%, 12/01/33  2,500  2,732,075 
Idaho Housing & Finance Association,     
   RB, GAN, RAN, Federal Highway Trust,     
   Series A, 5.00%, 7/15/27  900  957,168 
    3,689,243 
Illinois — 7.5%     
Chicago Public Building Commission     
   Building Illinois, RB, Series A (NPFGC),     
   7.00%, 1/01/20 (e)  5,000  6,489,350 
Illinois Finance Authority, RB, MJH     
   Education Assistance IV LLC, Sub-     
   Series B, 5.38%, 6/01/35 (f)(g)  700  49,686 
Illinois Finance Authority, RB, Monarch     
   Landing Inc. Facility, Series A, 7.00%,     
   12/01/37 (f)(g)  1,155  369,600 
Illinois Finance Authority, RB,     
   Northwestern Memorial Hospital,     
   Series A, 5.50%, 8/15/14 (c)  5,800  6,796,788 

2 BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010

Schedule of Investments (continued)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
Illinois (concluded)     
Illinois Finance Authority, RB, Roosevelt     
   University Project, 6.50%, 4/01/44  $ 1,500  $ 1,540,980 
Illinois Finance Authority, RB, Rush     
   University Medical Center, Series C,     
   6.63%, 11/01/39  1,200  1,254,264 
Illinois Finance Authority, Refunding RB,     
   Friendship Village Schaumburg,     
   Series A, 5.63%, 2/15/37  345  271,070 
    16,771,738 
Iowa — 1.7%     
Iowa Finance Authority, RB, Series A     
   (AGC), 5.63%, 8/15/37  3,600  3,722,076 
Kansas — 0.9%     
Kansas Development Finance Authority,     
   RB, University of Kansas Tenant,     
   Series O, 4.75%, 6/15/41  2,250  2,130,638 
Kentucky — 4.0%     
Kentucky Economic Development     
   Finance Authority, RB, Louisville     
   Arena, Sub-Series A-1 (AGC),     
 6.00%, 12/01/38  700  751,646 
Kentucky Economic Development     
   Finance Authority, Refunding RB,     
   Norton Healthcare Inc., Series B,     
   (NPFGC), 6.19%, 10/01/23 (a)  13,500  5,893,560 
Louisville/Jefferson County     
   Metropolitan Government, Refunding     
   RB, Jewish Hospital & St. Mary's     
   HealthCare, 6.13%, 2/01/37  2,250  2,319,525 
    8,964,731 
Maryland — 1.3%     
Maryland Community Development     
   Administration, Refunding RB,     
   Residential, Series A, AMT,     
 4.80%, 9/01/42  2,500  2,281,700 
Maryland Health & Higher Educational     
   Facilities Authority, Refunding RB,     
   University of Maryland Medical     
   System, 5.13%, 7/01/39  725  720,063 
    3,001,763 
Michigan — 4.8%     
Michigan State Building Authority,     
   Refunding RB, Facilities Program,     
   Series I, 6.25%, 10/15/38  1,875  2,040,094 
Michigan State Hospital Finance     
   Authority, Refunding RB, Henry Ford     
   Health System, Series A, 5.25%,     
   11/15/46  1,670  1,459,580 
Michigan State Hospital Finance     
   Authority, Refunding RB, Hospital,     
   Henry Ford Health, 5.75%, 11/15/39  4,110  4,012,305 

  Par   
Municipal Bonds  (000)  Value 
Michigan (concluded)     
Royal Oak Hospital Finance Authority     
   Michigan, Refunding RB, William     
   Beaumont Hospital, 8.25%, 9/01/39  $ 2,750  $ 3,188,405 
    10,700,384 
Minnesota — 1.7%     
City of Minneapolis Minnesota,     
   Refunding RB, Fairview Health     
   Services, Series B (AGC),     
 6.50%, 11/15/38  3,500  3,887,975 
Mississippi — 3.7%     
Mississippi Development Bank Special     
   Obligation, RB, Jackson County     
   Limited Tax Note, (AGC), 5.50%,     
   7/01/32  2,655  2,788,281 
Mississippi Development Bank Special     
   Obligation, RB, Jones County Junior     
   College (AGC), 5.13%, 3/01/39  1,500  1,511,310 
University of Southern Mississippi, RB,     
   Campus Facilities Improvements     
   Project, 5.38%, 9/01/36  3,750  3,961,237 
    8,260,828 
Missouri — 1.1%     
Missouri Joint Municipal Electric Utility     
   Commission, RB, Plum Point Project     
   (NPFGC), 4.60%, 1/01/36  2,820  2,380,616 
Multi-State — 3.2%     
Centerline Equity Issuer Trust, 7.60%,     
   12/15/50 (h)(i)  7,000  7,235,970 
Nebraska — 1.0%     
Omaha Public Power District, RB,     
   Series A, 4.75%, 2/01/44  2,265  2,246,110 
Nevada — 0.5%     
County of Clark Nevada, Refunding RB,     
   Alexander Dawson School Nevada     
   Project, 5.00%, 5/15/29  1,065  1,058,408 
New Jersey — 7.6%     
Middlesex County Improvement     
   Authority, RB, Subordinate, Heldrich     
   Center Hotel, Series B,     
 6.25%, 1/01/37  1,510  279,350 
New Jersey EDA, RB, Cigarette Tax,     
   5.75%, 6/15/29  7,000  6,871,270 
New Jersey EDA, RB, Motor Vehicle     
   Surcharge, Series A (NPFGC),     
 5.00%, 7/01/27  1,150  1,149,954 
New Jersey Educational Facilities     
   Authority, RB, Princeton University,     
   Series B, 4.25%, 7/01/40  2,600  2,476,214 
New Jersey Educational Facilities     
   Authority, Refunding RB, University of     
   Medicine & Dentistry, Series B,     
   7.13%, 12/01/23  950  1,077,072 

BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010 3

Schedule of Investments (continued)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
New Jersey (concluded)     
New Jersey Educational Facilities     
   Authority, Refunding RB, University of     
   Medicine & Dentistry, Series B,     
   7.50%, 12/01/32  $ 1,225  $ 1,380,943 
New Jersey Health Care Facilities     
   Financing Authority, RB, Virtua Health     
   (AGC), 5.50%, 7/01/38  1,450  1,512,741 
New Jersey State Housing & Mortgage     
   Finance Agency, RB, Series AA,     
   6.50%, 10/01/38  1,165  1,267,835 
University of Medicine & Dentistry of     
   New Jersey, RB, Series A (AMBAC),     
   5.50%, 12/01/27  1,000  1,004,350 
    17,019,729 
New York — 8.1%     
Albany Industrial Development Agency,     
   RB, New Covenant Charter School     
   Project, Series A, 7.00%, 5/01/35  725  456,736 
Long Island Power Authority, RB,     
   General, Series C, (CIFG),     
 5.25%, 9/01/29  2,000  2,191,100 
Long Island Power Authority, Refunding     
   RB, Series A, 6.25%, 4/01/33  480  551,866 
Long Island Power Authority, Refunding     
   RB, Series A, 5.75%, 4/01/39  2,475  2,678,148 
New York City Industrial Development     
   Agency, RB, American Airlines Inc.,     
   JFK International Airport, AMT,     
 7.63%, 8/01/25  2,600  2,538,276 
New York City Industrial Development     
   Agency, RB, Queens Baseball     
   Stadium, PILOT (AGC),     
 6.50%, 1/01/46  1,100  1,222,562 
New York Liberty Development Corp.,     
   RB, Goldman Sachs Headquarters,     
   5.25%, 10/01/35  2,000  2,010,260 
New York State Dormitory Authority, RB,     
   5.83%, 7/01/39 (b)  1,825  1,468,778 
New York State Dormitory Authority, RB,     
   Rochester Institute of Technology,     
   Series A, 6.00%, 7/01/33  1,625  1,783,486 
New York State Dormitory Authority, RB,     
   University of Rochester, Series A,     
   5.13%, 7/01/39  550  565,499 
New York State Dormitory Authority,     
   Refunding RB, Yeshiva University,     
   5.00%, 9/01/38  500  507,975 
Port Authority of New York & New     
   Jersey, Refunding RB, Consolidated,     
   152nd Series, AMT, 5.75%,     
   11/01/30  1,000  1,056,370 
State of New York, GO, Series A,     
 5.00%, 2/15/39  950  984,950 
    18,016,006 

  Par   
Municipal Bonds  (000)  Value 
North Carolina — 2.2%     
City of Charlotte North Carolina,     
   Refunding RB, Series A,     
 5.50%, 7/01/34 (d)  $ 325  $ 344,019 
Gaston County Industrial Facilities &     
   Pollution Control Financing Authority     
   North Carolina, RB, Exempt Facilities,     
   National Gypsum Co. Project, AMT,     
   5.75%, 8/01/35  2,425  1,557,480 
North Carolina Medical Care     
   Commission, RB, WakeMed, Series A     
   (AGC), 5.88%, 10/01/38  1,000  1,036,400 
North Carolina Medical Care     
   Commission, Refunding RB, University     
   Health System, Series D,     
 6.25%, 12/01/33  1,750  1,919,015 
    4,856,914 
Ohio — 6.0%     
County of Cuyahoga Ohio, Refunding     
   RB, Series A, 6.00%, 1/01/20  3,485  3,760,071 
County of Cuyahoga Ohio, Refunding     
   RB, Series A, 6.00%, 1/01/21  5,000  5,376,300 
Kent State University, Refunding RB,     
   General Receipts, Series B (AGC),     
   4.25%, 5/01/31  2,000  1,921,320 
Ohio Higher Educational Facility     
   Commission, RB, Kenyon College     
   Project, 4.75%, 7/01/39 (d)  2,450  2,363,368 
    13,421,059 
Oklahoma — 1.3%     
Tulsa Airports Improvement Trust, RB,     
   Series A, AMT,     
   7.75%, 6/01/35  2,900  2,840,579 
Oregon — 1.1%     
Oregon Health & Science University, RB,     
   Series A, 5.75%, 7/01/39  2,250  2,359,958 
Pennsylvania — 5.8%     
Delaware River Port Authority, RB, Port     
   District Project, Series B (AGM),     
   5.70%, 1/01/22  2,000  2,002,620 
McKeesport Area School District, GO,     
   CAB (FGIC), 5.53%,     
   10/01/31 (a)(c)(e)  870  331,644 
McKeesport Area School District, GO,     
   CAB (FGIC), 5.53%, 10/01/31 (a)  2,435  693,488 
Pennsylvania Economic Development     
   Financing Authority, RB, Amtrak     
   Project, Series A, AMT, 6.25%,     
   11/01/31  2,000  2,017,300 
Pennsylvania Economic Development     
   Financing Authority, RB, Amtrak     
   Project, Series A, AMT, 6.38%,     
   11/01/41  3,100  3,131,620 

4 BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010

Schedule of Investments (continued)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
Pennsylvania (concluded)     
Pennsylvania Economic Development     
   Financing Authority, RB, Reliant     
   Energy, Series A, AMT,     
 6.75%, 12/01/36  $ 4,645  $ 4,697,674 
    12,874,346 
Puerto Rico — 4.3%     
Puerto Rico Electric Power Authority,     
   Refunding RB, Series UU (AGM),     
   5.00%, 7/01/23  2,900  3,032,414 
Puerto Rico Housing Finance Authority,     
   Refunding RB, Subordinate, Capital     
   Fund Modernization,     
 5.13%, 12/01/27  2,500  2,502,475 
Puerto Rico Sales Tax Financing Corp.,     
   RB, First Sub-Series A, 5.75%,     
   8/01/37  3,000  3,059,370 
Puerto Rico Sales Tax Financing Corp.,     
   Refunding RB, CAB, Series A,     
   (NPFGC), 5.77%, 8/01/41 (a)  7,500  1,114,800 
    9,709,059 
Rhode Island — 3.1%     
Rhode Island Health & Educational     
   Building Corp., RB, Hosp Financing,     
   LifeSpan Obligation, Series A (AGC),     
   7.00%, 5/15/39  3,000  3,399,870 
Rhode Island Health & Educational     
   Building Corp., Refunding RB,     
   Hospital, Lifespan (NPFGC),     
 5.50%, 5/15/16  200  200,256 
Rhode Island Housing & Mortgage     
   Finance Corp., RB, Homeownership     
   Opportunity, Series 54, AMT,     
 4.85%, 10/01/41  2,165  1,988,184 
State of Rhode Island, COP, Series C,     
   School for the Deaf (AGC),     
 5.38%, 4/01/28  1,330  1,406,329 
    6,994,639 
South Carolina — 5.3%     
South Carolina Jobs EDA, Refunding RB,     
   Palmetto Health Alliance, Series A,     
   6.25%, 8/01/31  2,185  2,215,787 
South Carolina Jobs EDA, Refunding RB,     
   Palmetto Health, Series C,     
 6.88%, 8/01/13 (c)  3,560  4,231,380 
South Carolina Jobs EDA, Refunding RB,     
   Palmetto Health, Series C,     
 6.88%, 8/01/13 (c)  440  524,982 
South Carolina State Housing Finance &     
   Development Authority, Refunding     
   RB, Series A-2, AMT (AMBAC), 5.15%,     
   7/01/37  4,975  4,839,481 
    11,811,630 

  Par   
Municipal Bonds  (000)  Value 
Tennessee — 2.7%     
Memphis-Shelby County Airport     
   Authority, RB, Series D, AMT (AMBAC),     
   6.00%, 3/01/24  $ 3,865  $ 3,907,206 
Memphis-Shelby County Sports     
   Authority Inc., Refunding RB,     
   Memphis Arena Project, Series A,     
   5.25%, 11/01/27  1,135  1,156,599 
Memphis-Shelby County Sports     
   Authority Inc., Refunding RB,     
   Memphis Arena Project, Series A,     
   5.38%, 11/01/28  1,000  1,023,940 
    6,087,745 
Texas — 8.1%     
Harris County Health Facilities     
   Development Corp., Refunding RB,     
   Memorial Hermann Healthcare     
   System, Series B, 7.13%, 12/01/31  1,000  1,121,370 
Harris County Health Facilities     
   Development Corp., Refunding RB,     
   Memorial Hermann Healthcare     
   System, Series B, 7.25%, 12/01/35  2,650  2,968,954 
Harris County-Houston Sports Authority,     
   Refunding RB, CAB, Senior Lien,     
   Series A, (NPFGC),     
 6.17%, 11/15/38 (a)  5,000  630,850 
Lower Colorado River Authority,     
   Refunding RB (AMBAC),     
 4.75%, 5/15/36  2,000  1,915,860 
Lower Colorado River Authority,     
   Refunding RB (NPFGC),     
 5.00%, 5/15/13 (c)  20  22,499 
Lower Colorado River Authority,     
   Refunding RB, Series A (NPFGC),     
   5.00%, 5/15/13 (c)  5  5,625 
Matagorda County Navigation District     
   No. 1 Texas, Refunding RB, Central     
   Power & Light Co. Project, Series A,     
   6.30%, 11/01/29  2,200  2,376,792 
San Antonio Energy Acquisition Public     
   Facility Corp., RB, Gas Supply,     
 5.50%, 8/01/24  2,550  2,666,994 
Texas State Turnpike Authority, RB, CAB     
   (AMBAC), 6.05%, 8/15/31 (a)  15,000  3,420,900 
Texas State Turnpike Authority, RB, First     
   Tier, Series A (AMBAC),     
 5.00%, 8/15/42  3,325  3,038,784 
    18,168,628 
Virginia — 1.6%     
Tobacco Settlement Financing Corp.     
   Virginia, Refunding RB, Senior     
 Series B1, 5.00%, 6/01/47  2,900  2,021,561 
Virginia Small Business Financing     
   Authority, Refunding RB, Sentara     
   Healthcare, 5.00%, 11/01/40  1,550  1,545,055 
    3,566,616 

BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010 5

Schedule of Investments (continued)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
Washington — 1.0%     
Washington Health Care Facilities     
   Authority, RB, MultiCare Health     
   System, Series B (AGC),     
 6.00%, 8/15/39  $ 2,100  $ 2,214,408 
West Virginia --- 3.3%     
West Virginia Higher Education Policy     
   Commission, RB, Community &     
   Technology Capital Improvement,     
   Series A, 4.75%, 7/01/33  2,900  2,831,792 
West Virginia Higher Education Policy     
   Commission, RB, Community &     
   Technology Capital Improvement,     
   Series A, 5.00%, 7/01/39  1,265  1,240,117 
West Virginia Hospital Finance     
   Authority, Refunding RB, Charleston,     
   Series A, 5.63%, 9/01/32  3,500  3,414,600 
    7,486,509 
Wisconsin — 2.0%     
Wisconsin Health & Educational     
   Facilities Authority, RB, Aurora Health     
   Care, 6.40%, 4/15/33  3,220  3,280,214 
Wisconsin Housing & EDA, Refunding     
   RB, Series A, AMT, 4.75%, 9/01/33  1,250  1,164,362 
    4,444,576 
Wyoming — 1.7%     
County of Sweetwater Wyoming,     
   Refunding RB, Idaho Power Co.     
   Project, 5.25%, 7/15/26  1,800  1,860,264 
Wyoming Community Development     
   Authority, RB, Series 3, AMT,     
 4.75%, 12/01/37  2,145  1,968,316 
    3,828,580 
Total Municipal Bonds – 151.5%    338,642,105 
Municipal Bonds Transferred to Tender     
Option Bond Trusts (j)     
Colorado — 2.3%     
Colorado Health Facilities Authority, RB,     
   Catholic Health, Series C 7 (AGM),     
   5.00%, 9/01/36  5,250  5,166,263 
Illinois — 1.5%     
Chicago New Public Housing Authority,     
   Illinois, Refunding RB (AGM),     
 5.00%, 7/01/24  3,194  3,314,368 
Massachusetts — 1.4%     
Massachusetts Water Resources     
   Authority, RB, Generation, Series A,     
   5.00%, 8/01/41  3,070  3,119,396 
New York — 2.3%     
New York City Municipal Water Finance     
   Authority, RB, Fiscal 2009, Series A,     
   5.75%, 6/15/40  690  769,308 

Municipal Bonds Transferred to Tender    Par   
Option Bond Trusts (j)    (000)  Value 
New York (concluded)       
New York City Municipal Water Finance       
  Authority, RB, Series FF-2,       
  5.50%, 6/15/40  $ 810  $ 886,061 
New York State Dormitory Authority, RB,       
  New York University, Series A,       
  5.00%, 7/01/38    3,350  3,444,823 
Total Municipal Bonds in New York      5,100,192 
Ohio — 1.9%       
County of Montgomery, Ohio, RB,       
  Catholic Health, Series C 1 (AGM),       
  5.00%, 10/01/41    1,740  1,688,740 
Ohio State Higher Educational Facility       
  Commission, RB, Hospital Cleveland       
  Clinic Health, Series A,       
  5.25%, 1/01/33    2,600  2,665,910 
Total Municipal Bonds in Ohio      4,354,650 
Total Municipal Bonds Transferred to       
Tender Option Bond Trusts – 9.4%      21,054,869 
Total Long-Term Investments       
(Cost – $363,510,088) – 160.9%      359,696,974 
Short-Term Securities    Shares   
FFI Institutional Tax-Exempt Fund,       
0.16% (k)(l)  3,415,546  3,415,546 
Total Short-Term Securities       
(Cost – $3,415,546) – 1.5%      3,415,546 
Total Investments       
(Cost – $366,925,634*) – 162.4%      363,112,520 
Liabilities in Excess of Other Assets – (1.1)%    (2,437,674) 
Liability for Trust Certificates, Including Interest   
Expense and Fees Payable – (5.0)%      (11,143,903) 
Preferred Shares, at Redemption Value – (56.3)%  (125,958,961) 
Net Assets Applicable to Common Shares – 100.0%  $ 223,571,982 
*  The cost and unrealized appreciation (depreciation) of investments as of 
       January 31, 2010, as computed for federal income tax purposes, were 
       as follows:       
       Aggregate cost      $ 356,536,807 
       Gross unrealized appreciation      $ 14,288,220 
       Gross unrealized depreciation      (18,849,909) 
       Net unrealized depreciation      $ (4,561,689) 
(a) Represents a zero-coupon bond. Rate shown reflects the current yield as 
   of report date.       
(b) Represents a step-down bond that pays an initial coupon rate for the first 
   period and then a lower coupon rate for the following periods. Rate 
   shown reflects the current yield.       
(c) US government securities, held in escrow, are used to pay interest on this 
  security, as well as to retire the bond in full at the date indicated, typically 
   at a premium to par.       

6 BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010

Schedule of Investments (concluded)

BlackRock Investment Quality Municipal Trust (BKN)
(Percentages shown are based on Net Assets)

(d) When-issued security. Unsettled when-issued security transactions were 
  as follows:       
      Market  Unrealized 
  Counterparty    Value  Depreciation 
  Merrill Lynch                   $ 5,588,377$  (27,884) 
(e)Security is collateralized by Municipal or US Treasury obligations. 
(f)  Issuer filed for bankruptcy and/or is in default of interest payments. 
(g) Non-income producing security.       
(h) Security exempt from registration under Rule 144A of the Securities Act 
  of 1933. These securities may be resold in transactions exempt from 
  registration to qualified institutional investors.   
(i)  Security represents a beneficial interest in a trust. The collateral 
  deposited into the trust is federally tax-exempt revenue bonds issued by 
  various state or local governments, or their respective agencies or 
  authorities. The security is subject to remarketing prior to its stated 
  maturity, and is subject to mandatory redemption at maturity. 
(j)  Securities represent bonds transferred to a tender option bond trust in 
  exchange for which the Trust acquired residual interest certificates. 
  These securities serve as collateral in a financing transaction. 
(k) Investments in companies considered to be an affiliate of the Trust, for 
  purposes of Section 2(a)(3) of the Investment Company Act of 1940, 
  were as follows:       
      Net   
  Affiliate    Activity  Income 
  FFI Institutional Tax-Exempt Fund    $ (7,984,454)                                 $ 17,446 
(l)  Represents the current yield as of report date.   
• Fair Value Measurements — Various inputs are used in determining the 
  fair value of investments, which are as follows:   
  • Level 1 — price quotations in active markets/exchanges for identical 
     assets and liabilities       
  • Level 2 — other observable inputs (including, but not limited to: quoted 
      prices for similar assets or liabilities in markets that are active, quoted 
     prices for identical or similar assets or liabilities in markets that are not 
     active, inputs other than quoted prices that are observable for the 
     assets or liabilities (such as interest rates, yield curves, volatilities, 
     prepayment speeds, loss severities, credit risks and default rates) or 
     other market-corroborated inputs)     
  • Level 3 — unobservable inputs based on the best information available 
      in the circumstances, to the extent observable inputs are not available 
     (including the Trust’s own assumptions used in determining the fair 
     value of investments)       
  The inputs or methodologies used for valuing securities are not 
  necessarily an indication of the risk associated with investing in those 
  securities. For information about the Trust’s policy regarding valuation of 
  investments and other significant accounting policies, please refer to the 
  Trust’s most recent financial statements as contained in the semi-annual 
  report.       

The following table summarizes the inputs used as of January 31, 2010 
in determining the fair valuation of the Trust’s investments: 
  Investments in 
Valuation Inputs  Securities 
  Assets 
Level 1 - Short-Term Securities  $ 3,415,546 
Level 2 - Long-Term Investments1  359,696,974 
Level 3  - 
Total  $ 363,112,520 
1See above Schedule of Investments for values in each state or political 
   subdivision.   

BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST JANUARY 31, 2010 7

Item 2 – Controls and Procedures

2(a) – 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”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13(a)-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) 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

Certifications – Attached hereto

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.

BlackRock Investment Quality Municipal Trust, Inc.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock Investment Quality Municipal Trust, Inc.

Date: March 19, 2010

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: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
BlackRock Investment Quality Municipal Trust, Inc.

Date: March 19, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock Investment Quality Municipal Trust, Inc.

Date: March 19, 2010