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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-21051

Name of Fund: BlackRock Maryland Municipal Bond Trust (BZM)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock Maryland Municipal Bond Trust, 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

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

Date of fiscal year end: 08/31/2008

Date of reporting period: 03/01/2008 – 05/31/2008

Item 1 – Schedule of Investments

BlackRock Maryland Municipal Bond Trust          
Schedule of Investments May 31, 2008 (Unaudited) (Percentages shown are based on Net Assets)
        Par      
    Municipal Bonds   (000)     Value
Maryland - 113.3%   Annapolis, Maryland, Special Obligation Revenue Bonds (Park Place          
    Project), Series A, 5.35%, 7/01/34 $ 500   $ 430,415
    Anne Arundel County, Maryland, EDR (Community College Project),          
    5.25%, 9/01/28   2,870     2,923,325
    Baltimore County, Maryland, Metropolitan District, GO, 67th Issue,          
    5%, 6/01/22   2,000     2,086,520
    Baltimore County, Maryland, Metropolitan District, GO, 68th Issue,          
    5%, 8/01/28   2,000     2,037,500
    Baltimore County, Maryland, Revenue Refunding Bonds (Oak Crest          
    Village, Inc.), Series A, 5%, 1/01/37   1,000     918,900
    Baltimore, Maryland, Special Obligation Tax Bonds (Harborview Lot          
    Number 2), 6.50%, 7/01/31   1,000     1,003,410
    Baltimore, Maryland, Wastewater Project Revenue Refunding Bonds,          
    Series A, 5.20%, 7/01/32 (a)   3,500     3,547,355
    Baltimore, Maryland, Wastewater Project Revenue Refunding Bonds,          
    Series A, 5.125%, 7/01/42 (a)   2,000     2,003,840
    Frederick County, Maryland, Special Obligation Tax Bonds (Urbana          
    Community Development Authority), 6.625%, 7/01/25   1,000     1,005,990
    Howard County, Maryland, Retirement Community Revenue          
    Refunding Bonds (Columbia Vantage House Corporation), Series A,          
    5.25%, 4/01/33   500     419,665
    Maryland State Community Development Administration,          
    Department of Housing and Community Development, Residential          
    Revenue Bonds, AMT, Series H, 5.10%, 9/01/37   250     238,307
    Maryland State Health and Higher Educational Facilities Authority          
    Revenue Bonds (Baltimore Board of Child Care), 5.375%, 7/01/32   2,000     2,022,900
    Maryland State Health and Higher Educational Facilities Authority          
    Revenue Bonds (Carroll County General Hospital), 6%, 7/01/37   1,990     2,022,218
    Maryland State Health and Higher Educational Facilities Authority          
    Revenue Bonds (Loyola College), 5%, 10/01/39   2,000     1,990,440
    Maryland State Health and Higher Educational Facilities Authority          
    Revenue Bonds (Union Hospital of Cecil County), 5.625%, 7/01/32   2,000     2,025,700
    Maryland State Health and Higher Educational Facilities Authority          
    Revenue Bonds (University of Maryland Medical System), 5.25%,          
    7/01/11 (b)   2,000     2,138,340
    Maryland State Health and Higher Educational Facilities Authority,          
    Revenue Refunding Bonds (Peninsula Regional Medical Center), 5%,          
    7/01/36   1,000     982,180

Portfolio Abbreviations
To simplify the listings of BlackRock Maryland Municipal Bond Trust's portfolio holdings in the Schedule of
Investments, we have abbreviated the names of many of the securities according to the list below.
  AMT Alternative Minimum Tax (subject to)
  EDR Economic Development Revenue Bonds
  GO General Obligation Bonds

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BlackRock Maryland Municipal Bond Trust            
Schedule of Investments May 31, 2008 (Unaudited) (Percentages shown are based on Net Assets)
        Par        
    Municipal Bonds   (000 )   Value  
    Maryland State Industrial Development Financing Authority, EDR            
    (Our Lady of Good Counsel School), Series A, 6%, 5/01/35 $ 1,000   $ 1,000,500  
    Maryland State Transportation Authority, Parking Revenue Bonds            
    (Baltimore/Washington International Airport), AMT, Series B,            
    5.125%, 3/01/24 (c)   2,000     1,992,360  
    Montgomery County, Maryland, Lease Revenue Bonds (Metrorail            
    Garage Projects), 5%, 6/01/23   500     520,200  
    Montgomery County, Maryland, Lease Revenue Bonds (Metrorail            
    Garage Projects), 5%, 6/01/24   1,435     1,492,974  
    Prince Georges County, Maryland, Special Obligation Bonds (National            
    Harbor Project), 5.20%, 7/01/34   1,500     1,263,060  
              34,066,099  
Puerto Rico - 20.6%   Children's Trust Fund Project of Puerto Rico, Tobacco Settlement            
    Revenue Refunding Bonds, 5.50%, 5/15/39   1,500     1,427,325  
    Puerto Rico Commonwealth Highway and Transportation Authority,            
    Highway Revenue Refunding Bonds, Series CC, 5.25%, 7/01/36 (d)   2,595     2,816,198  
    Puerto Rico Commonwealth Highway and Transportation            
    Authority, Transportation Revenue Refunding Bonds, Series D,            
    5.25%, 7/01/12 (b)   1,500     1,606,170  
    Puerto Rico Public Buildings Authority, Government Facilities            
    Revenue Refunding Bonds, Series D, 5.375%, 7/01/33   350     350,809  
              6,200,502  
    Total Municipal Bonds            
    (Cost - $39,605,190) - 133.9%         40,266,601  
    Municipal Bonds Transferred to Tender Option            
    Bond Trusts (e)            
Maryland - 10.3%   Maryland State Transportation Authority, Transportation Facilities            
    Projects Revenue Bonds, 5%, 7/01/41 (d)   3,000     3,089,460  
    Total Municipal Bonds Transferred to Tender Option            
    Bond Trusts (Cost - $3,057,849) - 10.3%         3,089,460  
    Corporate Bonds            
Multi-State - 7.5%   Charter Mac Equity Issuer Trust, 7.20%, 10/31/52 (f)   2,000     2,244,640  
    Total Corporate Bonds            
    (Cost - $2,000,000) - 7.5%         2,244,640  
    Short-Term Securities   Shares        
    Merrill Lynch Institutional Tax-Exempt Fund, 1.71% (g)(h)   3,800,000     3,800,000  
    Total Short-Term Securities            
    (Cost - $3,800,000) - 12.6%         3,800,000  
    Total Investments (Cost - $48,463,039*) - 164.3%         49,400,701  
    Other Assets Less Liabilities - 2.3%         687,512  
    Liability for Trust Certificates,            
    Including Interest Expense and Fees Payable - (6.6%)         (1,999,528 )
    Preferred Shares, at Redemption Value - (60.0%)         (18,012,611 )
    Net Assets Applicable to Common Shares - 100.0%       $ 30,076,074  

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BlackRock Maryland Municipal Bond Trust
Schedule of Investments May 31, 2008 (Unaudited)
          * The cost and unrealized appreciation (depreciation) of investments as of May 31, 2008,
  as computed for federal income tax purposes, were as follows:
  Aggregate cost $ 46,401,687    
  Gross unrealized appreciation $ 1,520,815    
  Gross unrealized depreciation   (520,301 )  
  Net unrealized appreciation $ 1,000,514    

(a) FGIC Insured.
 
(b) U.S. 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.
 
(c) AMBAC Insured.
 
(d) FSA Insured.
 
(e) Securities represent bonds transferred to a tender option bond trust in exchange for which the Trust acquired residual interest certificates. These securities serve as a collateral in a financing transaction.
 
(f) 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. The Trust is not obligated for costs associated with the registration of restricted securities.
 
(g) Represents the current yield as of report date.
 
(h) 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   Dividend  
  Affiliate Activity   Income  
  Merrill Lynch Institutional Tax-Exempt Fund 3,600,000   $ 21,785      

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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 13a-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 Maryland Municipal Bond Trust 
 
    By: /s Donald C. Burke    
      Donald C. Burke   
      Chief Executive Officer of   
      BlackRock Maryland Municipal Bond Trust   
 
    Date: July 18, 2008   
 
    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/ Donald C. Burke    
      Donald C. Burke   
      Chief Executive Officer (principal executive officer) of   
      BlackRock Maryland Municipal Bond Trust   
 
      Date: July 18, 2008   
 
    By: /s/ Neal J. Andrews    
      Neal J. Andrews   
      Chief Financial Officer (principal financial officer) of   
      BlackRock Maryland Municipal Bond Trust   
 
    Date: July 18, 2008