UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-22126

Name of Fund: BlackRock Defined Opportunity Credit Trust (BHL)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock
Defined Opportunity Credit 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: 08/31/2009

Date of reporting period: 05/31/2009

Item 1 – Schedule of Investments


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)   Value  
Aerospace & Defense - 2.0%   Avio SpA Facility B2, 2.444% - 3.936%, 12/15/14   USD   468   $ 317,865  
  Avio SpA Facility C2, 3.069% - 4.561%, 12/14/15     500   339,375  
  Hawker Beechcraft Acquisition Co. LLC Letter of Credit      
  Facility Deposit, 3.22%, 3/26/14     135   77,202  
  Hawker Beechcraft Acquisition Co. LLC Term Loan,      
  2.319% - 3.22%, 3/26/14     2,285   1,311,409  
        2,045,851  
Auto Components - 2.9%   Allison Transmission, Inc. Term Loan, 3.12% - 3.15%,      
  8/07/14     2,177   1,679,250  
  Dana Holding Corp. Term Advance, 7.25%, 1/31/15   1,318   623,235  
  The Goodyear Tire & Rubber Co., Term Loan        
  (Second Lien), 2.07%, 4/30/14     750   627,071  
        2,929,556  
Building Products - 1.6%   Building Materials Corp. of America Term Loan Advance,      
  3.063%, 2/22/14     743   626,722  
  Momentive Performance Materials (Blitz 06-103 GmbH)      
  Tranche B-2 Term Loan, 3.191%, 12/04/13                             EUR   1,000   965,680  
        1,592,402  
Capital Markets - 0.9%   Nuveen Investments, Inc. Term Loan, 3.313% - 4.232%,      
  11/13/14                             USD   1,307   933,273  
Chemicals - 7.9%   Ashland, Inc. Term Loan B, 7.65%, 5/13/14     900   898,875  
  Brenntag Holding GmbH & Co. KG Facility B2, 2.30% -      
  3.501%, 1/20/14     995   850,559  
  Cognis GMBH Facility C, 3.32%, 9/15/13     1,000   822,500  
  Huish Detergents Inc. Tranche B Term Loan, 2.07%, 4/26/14   990   910,730  
                                                                    Matrix Acquisition Corp. (MacDermid, Inc.) Tranche B Term
  Loan, 2.319%, 4/12/14     1,562   1,054,539  
  Nalco Co. Term Loan B, 6.50%, 5/06/16     1,225   1,227,297  
  PQ Corp. (fka Niagara Acquisition, Inc.) Loan (Second      
  Lien), 7.54%, 7/30/15     1,000   503,333  
  PQ Corp. (fka Niagara Acquisition, Inc.) Term Loan (First      
  Lien), 4.29% - 4.47%, 7/31/14     1,243   938,088  
  Solutia Inc. Loan, 7.25%, 2/28/14     990   797,283  
        8,003,204  
Commercial Services & Supplies -   Alliance Laundry Systems LLC Term Loan, 3.174% - 3.607%,      
3.8%   1/27/12     737   681,579  
  ARAMARK Corp. Facility Letter of Credit, 4.063%,        
  1/26/14     119   108,598  
  ARAMARK Corp. U.S. Term Loan, 3.095%, 1/26/14   1,881   1,709,402  
  Kion Group GmbH (formerly Neggio Holdings 3 GmbH)      
  Facility B, 2.319%, 12/29/14     500   210,938  
  Kion Group GmbH (formerly Neggio Holdings 3 GmbH)      
  Facility C, 2.819%, 12/29/15     500   210,938  
                                                                    Synagro Technologies, Inc. Term Loan (First Lien), 2.32% -
  2.34%, 4/02/14     990   737,494  
  West Corp. Term B-2 Loan, 2.684% - 2.789%, 10/24/13   210   181,366  
        3,840,315  

1


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)   Value  
Computers & Peripherals - 0.9%   Intergraph Corp. Initial Term Loan (First Lien), 2.664%,      
  5/29/14                             USD   1,000   $ 915,000  
Containers & Packaging - 3.8%   Crown Americas LLC Additional Term B Dollar Loan,      
  2.094%, 11/15/12     495   475,102  
  Graphic Packaging International, Inc. Incremental Term      
  Loan, 3.099% - 3.958%, 5/16/14     1,480   1,372,761  
  Smurfit Kappa Acquisitions (JSG) C1 Term Loan Facility,      
  2.941% - 3.739%, 7/16/15                               EUR   500   617,908  
  Smurfit Kappa Acquisitions (JSG) Term B1, 2.691% -      
  4.912%, 7/16/14     500   617,908  
  Smurfit-Stone Container DIP Term loan, 8.75% - 10%,      
  7/28/10                             USD   744   751,247  
        3,834,926  
Diversified Consumer   Coinmach Corp. Term Loan, 3.31% - 3.76%, 11/14/14   1,485   1,128,571  
Services - 1.3%   Coinmach Laundry Corp. Delay Draw Term Loan, 3.40% -      
  5.25%, 11/14/14     250   185,000  
        1,313,571  
Diversified Telecommunication   BCM Ireland Holdings Ltd. (Eircom) Facility B, 2.816%,      
Services - 4.6%   8/14/14                             EUR   492   498,727  
  BCM Ireland Holdings Ltd. (Eircom) Facility C, 3.066%,      
  8/14/13     492   498,783  
  Hawaiian Telecom Communications, Inc. Tranche C Term      
  Loan, 4.75%, 5/30/14                             USD   502   253,471  
  Integra Telecom Holdings, Inc. Term Loan (First Lien),      
  5.47% - 7%, 8/31/13     1,977   1,598,413  
  PAETEC Holding Corp. Replacement Term Loan, 2.819%,      
  2/28/13     458   414,696  
  Time Warner Telecom Holdings Inc. Term Loan B Loan,      
  2.32%, 1/07/13     153   141,041  
  Wind Finance SA Euro Facility (Second Lien), 7.099%,      
  12/17/14                             EUR   1,000   1,291,068  
        4,696,199  
Electric Utilities - 0.4%   Astoria Generating Co. Acquisitions, LLC Second Lien      
  Term Loan C, 4.06%, 8/23/13                               USD   500   433,125  
Electronic Equipment,   Flextronics International Ltd. A Closing Date Loan,      
Instruments & Components - 2.5%      2.664% - 3.458%, 10/01/14     763   611,297  
  Flextronics International Ltd. Delay Draw Term Loan,      
  3.381%, 10/01/12     219   175,660  
  L-1 Identity Solutions Operating Co. Term Loan, 6.75%,      
  8/05/13     687   678,502  
  Matinvest 2 SAS/Butterfly Wendel US, Inc. (Deutsche      
  Connector) B-2 Facility, 2.661%, 6/22/14     909   561,470  
  Matinvest 2 SAS/Butterfly Wendel US, Inc. (Deutsche      
  Connector) C-2 Facility, 3.161%, 6/22/15     751   463,918  
        2,490,847  

2


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)           Value  
Energy Equipment & Services -   Dresser, Inc. Term B Loan, 3.104%, 5/04/14   USD   513   $ 445,062  
0.8%   Volnay Acquisition Co. I (aka CGG) B1 Term Loan Facility,      
  3.575% - 4.27%, 1/12/14     438   407,056  
        852,118  
Food & Staples Retailing - 1.2%   AB Acquisitions UK Topco 2 Ltd. Facility B2 UK Borrower,      
  3.599%, 7/09/15   GBP   1,000   1,234,154  
Food Products - 3.1%   Dole Food Co., Inc. Credit-Linked Deposit, 0.639% -      
  1.139%, 4/12/13   USD   127   126,429  
  Dole Food Co., Inc. Tranche B Term Loan, 7.25% - 8%,      
  4/12/13     223   221,581  
  Solvest, Ltd. (Dole) Tranche C Term Loan, 7.25% - 8%,      
  4/12/13     832   825,631  
  Wm. Wrigley Jr. Co. Tranche B Term Loan, 6.50%, 10/06/14   1,919   1,921,340  
        3,094,981  
Health Care Equipment &   Bausch & Lomb Inc. Delayed Draw Term Loan, 3.678% -      
Supplies - 2.8%   4.47%, 4/24/15     73   63,932  
  Bausch & Lomb Inc. Parent Term Loan, 4.47%, 4/24/15   387   336,709  
  Biomet, Inc. Dollar Term Loan, 3.313% - 4.222%, 3/25/15   975   915,636  
  DJO Finance LLC (ReAble Therapeutics Fin LLC) Term      
  Loan, 3.319% - 4.22%, 5/20/14     988   871,963  
  Hologic, Inc. Tranche B Term Loan, 3.625%, 3/31/13   208   198,804  
  Iasis Healthcare Delay Draw Term Loan, 5.704%, 3/14/14   32   28,945  
  Iasis Healthcare Line of Credit, 2.319%, 3/14/14   120   107,731  
  Iasis Healthcare Term Loan B, 2.319%, 3/14/14   347   311,323  
        2,835,043  
Health Care Providers &   CHS/Community Health Systems, Inc. Delayed Draw Term      
Services - 11.2%   Loan, 2.569%, 7/25/14     164   145,840  
  CHS/Community Health Systems, Inc. Funded Term Loan,      
  2.569% - 2.924%, 7/25/14     3,233   2,868,537  
  DaVita, Inc. Term Loan B, 1.82% - 2.74%, 10/05/12   800   747,125  
  Fresenius AG Term Loan B1, 6.75%, 7/06/14     717   716,400  
  Fresenius AG Term Loan B2, 6.75%, 7/06/14     433   432,737  
  HCA Inc. Tranche A-1 Term Loan, 2.97%, 11/17/12   3,405   3,046,571  
  HealthSouth Corp. Term Loan, 2.82% - 2.85%, 3/10/13   1,757   1,613,846  
  Surgical Care Affiliates, LLC Term Loan, 3.22%, 12/29/14   344   291,302  
  Symbion, Inc. Tranche A Term Loan, 3.569%, 8/23/13   476   351,865  
  Symbion, Inc. Tranche B Term Loan, 3.569%, 8/25/14   476   351,865  
  Vanguard Health Holding Co. II, LLC (Vanguard Health      
  System, Inc.) Replacement Term Loan, 2.569%, 9/23/11   860   812,700  
        11,378,788  
Health Care Technology - 0.4%   Sunquest Information Systems, Inc. (Misys Hospital      
  Systems, Inc.) Term Loan, 3.57% - 4.29%, 10/13/14   493   405,492  
Hotels, Restaurants & Leisure -   Harrah's Operating Co., Inc. Term B-2 Loan, 3.319% -      
3.3%   4.092%, 1/28/15     1,725   1,322,050  
  Penn National Gaming, Inc. Term Loan B, 2.06% - 2.72%,      
  10/03/12     982   923,534  
  QCE, LLC (Quiznos) Term Loan (First Lien), 3.50%,      
  5/05/13     990   631,506  

3


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)   Value  
VML US Finance LLC (aka Venetian Macau) Term B Delayed
  Draw Project Loan, 2.57%, 5/25/12   USD   181   $ 150,746  
  VML US Finance LLC (aka Venetian Macau) Term B Funded      
  Project Loan, 2.57%, 5/27/13     319   266,254  
        3,294,090  
Household Durables - 2.6%   Jarden Corp. Term Loan B3, 3.72%, 1/24/12     1,432   1,372,653  
  Yankee Candle Co., Inc. Term Loan, 2.32% - 3.22%, 2/06/14   1,521   1,295,321  
        2,667,974  
Household Products - 0.3%   VI-JON, Inc. (VJCS Acquisition, Inc.) Tranche B Term      
  Loan, 2.566%, 4/24/14     350   311,500  
IT Services - 5.6%   Amadeus Global Travel Distribution SA Term Loan B,      
  2.45%, 5/22/15     955   712,100  
  Amadeus Global Travel Distribution SA Term Loan C,      
  2.95%, 5/22/16     955   712,100  
  Ceridian Corp U.S. Term Loan, 3.316%, 11/09/14   1,977   1,455,745  
  First Data Corp. Initial Tranche B-2 Term Loan, 3.059% -      
  3.069%, 9/24/14     1,371   1,004,981  
  First Data Corp. Initial Tranche B-3 Term Loan, 3.059% -      
  3.069%, 9/24/14     989   725,456  
  SunGard Data Systems Inc. (Solar Capital Corp.) New U.S.      
  Term Loan, 2.132% - 2.724%, 2/28/14     629   569,913  
  SunGard Data Systems Inc. (Solar Capital Corp.) New U.S.      
  Term Loan, 6.75%, 2/28/14     474   465,459  
        5,645,754  
Independent Power Producers &   Dynegy Holdings Inc. Term Letter of Credit Facility Term      
Energy Traders - 7.0%   Loan, 1.82%, 4/02/13     208   186,715  
  Dynegy Holdings Inc. Tranche B Term Loan, 1.82%, 4/02/13   17   15,146  
  Mirant North America, LLC Term Loan, 2.069%, 1/03/13   679   630,730  
  NRG Energy, Inc. Credit-Linked Deposit, 1.12%, 2/01/13   164   151,269  
  NRG Energy, Inc. Term Loan, 2.72%, 2/01/13     1,602   1,482,085  
  Texas Competitive Electric Holdings Co., LLC (TXU) Initial      
  Tranche B-1 Term Loan, 3.819% - 3.882%, 10/10/14   495   337,820  
  Texas Competitive Electric Holdings Co., LLC (TXU) Initial      
  Tranche B-2 Term Loan, 3.819%, 10/10/14     1,500   1,032,750  
  Texas Competitive Electric Holdings Co., LLC (TXU) Initial      
  Tranche B-3 Term Loan, 3.819% - 3.882%, 10/10/14   4,690   3,205,940  
        7,042,455  
Industrial Conglomerates - 0.7%   Sequa Corp. Term Loan, 3.61% - 4.08%, 12/03/14   989   744,095  
Insurance - 0.6%   Alliant Holdings I, Inc. Term Loan, 4.232%, 8/21/14   737   626,848  
Internet & Catalog Retail - 0.2%   FTD Group, Inc. Tranche B Term Loan, 6.75%, 8/04/14   249   238,800  
Life Sciences Tools &   Life Technologies Corp. Term B Facility, 5.25%, 11/20/15   1,244   1,240,485  
Services - 1.2%          
Machinery - 3.0%   LN Acquisition Corp. (Lincoln Industrial) Delayed Draw      
  Term Loan (First Lien), 2.90%, 7/11/14     254   225,899  
  LN Acquisition Corp. (Lincoln Industrial) Initial U.S. Term      
  Loan (First Lien), 2.90%, 7/11/14     677   602,398  

4


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)   Value  
  Navistar International Corp. Revolving Credit-Linked      
  Deposit, 3.569% - 3.66%, 1/19/12   USD   533   $ 444,762  
  Navistar International Corp. Term Advance, 3.569%, 1/19/12   1,467   1,223,096  
  Oshkosh Truck Corp. Term B Loan, 3.03% - 7.32%, 12/06/13   583   499,222  
        2,995,377  
Media - 29.7%   AlixPartners, LLP Tranche C Term Loan, 2.35% - 3.14%,      
  10/12/13     500   472,500  
  Alpha Topco Ltd. (Formula One) Facility B1, 2.694%, 12/31/13   560   392,100  
  Alpha Topco Ltd. (Formula One) Facility B2, 2.694%, 12/31/13   378   264,852  
  Bresnan Communications, LLC Additional Term Loan B      
  (First Lien), 2.31% - 3.11%, 6/30/13     750   682,031  
  CSC Holdings Inc. (Cablevision) Incremental Term Loan,      
  2.094% - 2.25%, 3/29/13     1,724   1,615,645  
  Catalina Marketing Corp. Initial Term Loan, 3.395%, 10/01/14   799   724,800  
  Cengage Learning Acquisitions, Inc. (Thomson Learning)      
  Tranche 1 Incremental Term Loan, 7.50%, 7/03/14   2,481   2,378,278  
  Cequel Communications, LLC (aka Cebridge) Term Loan,      
  2.349% - 2.401%, 11/05/13     2,470   2,226,215  
  Charter Communications Operating, LLC Replacement      
  Term Loan, 4.25% - 6.25%, 3/06/14     1,287   1,090,571  
  Charter Communications Term Loan B1, 7.939%, 3/25/14   500   485,417  
  Clarke American Corp. Tranche B Term Loan, 2.819% -      
  3.72%, 6/30/14     1,476   1,137,860  
  Discovery Communications Holding, LLC Term B Loan,      
  3.22%, 5/14/14     485   452,695  
  FoxCo Acquisition Sub, LLC Term Loan, 6.50% - 7.25%,      
  7/14/15     674   426,303  
  Gray Television, Inc. Term Loan B - DD, 3.92%, 12/31/14   482   258,505  
  HMH Publishing Co. Ltd. (fka Education Media) Tranche A      
  Term Loan, 7.66%, 6/12/14     2,003   1,426,861  
  Hanley-Wood, LLC (FSC Acquisition) Term Loan, 2.563% -      
  2.599%, 3/08/14     495   176,462  
                                      Hargray Acquisition Co.,/DPC Acquisition LLC/HCP Acquisition
  LLC, Term Loan (First Lien), 3.257%, 6/27/14     491   420,870  
  Idearc Inc. (Verizon) Tranche B Term Loan, 3.22%,      
  11/17/14 (a)(b)     358   140,496  
  Insight Midwest Holdings, LLC B Term Loan, 2.41%,      
  4/07/14     500   461,042  
  Intelsat Corp. (fka PanAmSat Corp.) Term B-2-B, 2.914%,      
  1/03/14     662   603,422  
  Intelsat Corp. (fka PanAmSat Corp.) Term B-2-C, 2.914%,      
  1/03/14     662   603,422  
  Intelsat Corp. (fka PanAmSat Corp.) Tranche B-2-A Term      
  Loan, 2.914%, 1/03/14     662   603,605  
                                      Lavena Holding 3 GmbH (Prosiebensat.1 Media AG) Facility
  B1, 4.589%, 6/28/15   EUR   1,010   335,277  
                                      Lavena Holding 3 GmbH (Prosiebensat.1 Media AG) Facility
  C1, 4.839%, 6/30/16     1,010   335,277  

5


BlackRock Defined Opportunity Credit Trust          
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
        Par    
Industry   Floating Rate Loan Interests       (000)           Value  
  Local TV Finance, LLC Term Loan, 2.32%, 5/07/13   USD   1,973   $ 966,655  
  MCC Iowa LLC (Mediacom Broadband Group) Tranche D-1        
  Term Loan, 2.04%, 1/31/15       377   343,484  
  MCC Iowa LLC (Mediacom Broadband Group) Tranche D-2        
  Term Loan, 2.04%, 1/31/15       247   225,320  
  Mediacom Broadband (Term Loan E), 6.50%, 11/30/15     825   819,844  
  NTL Cable Plc Term Loan, 3.889%, 11/19/37     GBP   389   565,266  
  NTL Cable Plc Term Loan B, 5.389%, 9/03/12       469   683,579  
  NV Broadcasting, LLC Term Loan (First Lien), 5.25%,        
  11/01/13     USD   1,639   409,710  
  Newsday, LLC Fixed Rate Term Loan, 9.75%, 8/01/13     250   249,375  
  Newsday, LLC Floating Rate Term Loan, 6.631%, 8/01/13     500   478,125  
  Nielsen Finance LLC Dollar Term Loan, 2.382%, 8/09/13     2,466   2,171,110  
  Parkin Broadcasting, LLC Term Loan, 5.25%, 11/01/13     336   84,042  
  Sunshine Acquisition Ltd. (aka HIT Entertainment) Term        
  Facility, 3.26%, 7/31/14       1,751   927,916  
  Tribune Co. Term Debtor in Possession, 9%, 4/07/10     350   350,875  
  TWCC Holding Corp. Term Loan, 6.25%, 9/14/15     1,398   1,390,136  
  UPC Financing Partnership M Facility, 2.946%, 12/31/14   EUR   750   908,601  
  UPC Financing Partnership M Facility, 2.946%, 11/19/37     850   1,029,748  
  Virgin Media NTL Term Loan B, 5.389%, 9/03/12   GBP   281   408,934  
  Wallace Theater Corp. (Hollywood Theaters) First Lien        
  Term Loan, 5.50%, 7/31/09     USD   400   320,000  
          30,047,226  
Metals & Mining - 0.6%   Algoma Steel Inc. Term Loan, 2.82%, 6/20/13       992   600,417  
Multi-Utilities - 0.4%   FirstLight Power Resources, Inc. (fka NE Energy, Inc.) First        
  Lien Term Loan B, 3.75%, 11/01/13       443   396,054  
  FirstLight Power Resources, Inc. (fka NE Energy, Inc.)        
  Synthetic Letter of Credit, 3.75%, 11/01/13       57   51,030  
          447,084  
Multiline Retail - 1.4%   Dollar General Corp. Tranche B-1 Term Loan, 3.069% -        
  3.789%, 7/07/14       1,500   1,404,644  
Oil, Gas & Consumable Fuels -   Big West Oil, LLC Delayed Advance Loan, 6.50%, 5/15/14     567   445,413  
1.6%   Big West Oil, LLC Initial Advance Loan, 6.50%, 5/15/14     233   182,587  
  Petroleum GEO-Services ASA/PGS Finance, Inc. Term        
  Loan, 2.97%, 6/29/15       508   462,280  
  Vulcan Energy Corp. (fka Plains Resources Inc) Term B3        
  Loan, 5.50%, 8/12/11       500   482,500  
          1,572,780  
Paper & Forest Products - 3.4%   Georgia-Pacific LLC Term B Loan, 2.319% - 3.293%,        
  12/20/12       2,660   2,465,128  
  NewPage Corp. Term Loan, 4.063% - 5%, 12/22/14     1,217   978,322  
          3,443,450  
Personal Products - 0.9%   American Safety Razor Co., LLC Loan (Second Lien),        
  6.57%, 1/30/14       1,250   887,500  
Pharmaceuticals - 0.7%   Warner Chilcott Co., Inc. Tranche B Acquisition Date        
  Term Loan, 2.319% - 3.22%, 1/18/12       483   456,684  

6


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
      Par    
Industry   Floating Rate Loan Interests     (000)   Value  
  Warner Chilcott Corp. Tranche C Acquisition Date Term      
  Loan, 2.139%, 1/18/12   USD   217   $ 204,700  
        661,384  
Professional Services - 1.0%   Booz Allen Hamilton Inc. Tranche B Term Loan, 7.50%,      
  7/31/15     995   986,003  
Road & Rail - 0.7%   RailAmerica, Inc. Canadian Term Loan, 5.20%, 8/14/09   65   62,295  
  RailAmerica, Inc. U.S. Term Loan, 5.20%, 8/14/09   685   653,955  
        716,250  
Specialty Retail - 0.8%   Adesa, Inc. (KAR Holdings, Inc.) Initial Term Loan,      
  2.57% - 3.47%, 10/20/13     400   342,500  
General Nutrition Centers, Inc. Term Loan, 3.45% - 4.50%,
  9/16/13     560   481,600  
        824,100  
Textiles, Apparel & Luxury   Hanesbrands Inc. Term B Loan (First Lien), 5.085% -      
Goods - 0.4%   5.842%, 9/05/13     436   426,014  
Transportation Infrastructure -   SBA Telecommunications Term Loan, 1.994%, 11/01/10   993   883,966  
0.9%          
Wireless Telecommunication   Cricket Communications, Inc. (aka Leap Wireless) Term B      
Services - 3.6%   Loan, 5.75%, 6/16/13     1,567   1,573,302  
  Digicel Group Term Loan B, 3.75%, 3/01/12   925   839,438  
  MetroPCS Wireless, Inc. New Tranche B Term Loan,      
  2.625% - 3.313%, 11/03/13     1,275   1,199,658  
        3,612,398  
  Total Floating Rate Loan Interests - 122.7%     124,149,439  
  Corporate Bonds        
Chemicals - 0.2%   Nalco Co., 8.25%, 5/15/17 (c)     250   251,250  
Containers & Packaging - 0.5%   Crown Americas LLC, 7.625%, 5/15/17 (c)   280   274,400  
  Owens-Brockway Glass Container, Inc., 7.375%,      
  5/15/16 (c)     280   270,900  
        545,300  
Diversified Financial   FCE Bank Plc, 7.125%, 1/16/12                           EUR   100   120,165  
Services - 0.1%          
Diversified Telecommunication   Qwest Corp., 4.57%, 6/15/13 (d)                           USD   750   673,125  
Services - 0.7%          
Hotels, Restaurants &   MGM Mirage, 10.375%, 5/15/14 (c)     300   309,000  
Leisure - 0.6%   MGM Mirage, 11.125%, 11/15/17 (c)   240   251,400  
        560,400  
Independent Power Producers &   Calpine Construction Finance Co. LP, 8%, 6/01/16 (c)   750   713,437  
Energy Traders - 0.7%          
Media - 1.5%   DIRECTV Holdings LLC, 8.375%, 3/15/13   750   755,625  
  EchoStar DBS Corp., 6.375%, 10/01/11   750   724,688  
        1,480,313  
Paper & Forest Products - 0.2%   Verso Paper Holdings LLC, 11.50%, 7/01/14 (c)   200   183,936  
Wireless Telecommunication   Cricket Communications, Inc., 7.75%, 5/15/16 (c)   1,500   1,449,375  
Services - 1.4%          
  Total Corporate Bonds - 5.9%       5,977,301  
  Total Long-Term Investments        
  (Cost - $148,332,767) - 128.6%       130,126,740  

7


BlackRock Defined Opportunity Credit Trust        
Schedule of Investments May 31, 2009 (Unaudited)   (Percentages shown are based on Net Assets)  
                                                                                        Short-Term Securities     Shares   Value  
                                                                                        BlackRock Liquidity Funds, TempFund, 0.535% (e)(f)   3,055,622   $ 3,055,622  
                                                                                        Total Short-Term Securities        
                                                                                        (Cost - $3,055,622) - 3.0%       3,055,622  
                                                                                        Total Investments (Cost - $151,388,389*)   - 131.6%     133,182,362  
                                                                                        Liabilities in Excess of Other Assets - (31.6)%     (31,956,193)  
                                                                                        Net Assets - 100.0%       $ 101,226,169  

* The cost and unrealized appreciation (depreciation) of investments as of May 31, 2009, as computed
for federal income tax purposes, were as follows:

Aggregate cost   $ 151,186,800  
Gross unrealized appreciation   $ 933,368  
Gross unrealized depreciation   (18,937,806)  
Net unrealized depreciation   $ (18,004,438)  

(a) Issuer filed for bankruptcy and/or is in default of interest payments.
(b) Non-income producing security.
(c) 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.

(d) Variable rate security. Rate shown is as of report date.
(e) Represents the current yield as of report date.
(f) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment
Company Act of 1940, were as follows:

Affiliate   Net Activity   Income  
BlackRock Liquidity Funds, TempFund   3,055,622   $ 3,218  
BlackRock Liquidity Series, LLC Cash Sweep Series   $ (2,365,561)   $ 14,989  

For Fund compliance purposes, the Fund's industry classifications refer to any one or more of the industry sub-
classifications used by one or more widely recognized market indexes or ratings group indexes, and/or as defined by
Fund management. This definition may not apply for purposes of this report, which may combine such industry sub-
classifications for reporting ease.

Foreign currency exchange contracts as of May 31, 2009 were as follows:

            Unrealized  
  Currency     Currency     Settlement   Appreciation  
  Purchased     Sold   Counterparty   Date   (Depreciation)  
EUR   73,000   USD   101,803   Citibank NA   6/02/09   $ 1,394  
USD   2,158,662   GBP   1,543,500   UBS AG   6/10/09   (335,970)  
USD   7,225,029   EUR   5,303,000   Citibank NA   7/15/09   (269,025)  
Total             $ (603,601)  

Currency Abbreviations:

EUR   Euro  
GBP   British Pound  
USD   US Dollar  

8


BlackRock Defined Opportunity Credit Trust

Schedule of Investments May 31, 2009 (Unaudited)

Financial Accounting Standards Board Statement of Financial Accounting Standards No. 157, "Fair Value Measurements"
clarifies the definition of fair value, establishes a framework for measuring fair values and requires additional
disclosures about the use of 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 securities
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 Fund's own assumptions used in determining the fair value of
investments)

The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with
investing in those securities. For information about the Fund's policy regarding valuation of investments and other
significant accounting policies, please refer to the Fund's most recent financial statements as contained in its semi-
annual report.

The following table summarizes the inputs used as of May 31, 2009 in determining the fair valuation of the
Fund's investments:

Valuation   Investments in   Other Financial  
Inputs   Securities   Instruments*  
  Assets   Assets   Liabilities  
Level 1   $ 3,055,622   -   -  
Level 2   99,137,607   $ 1,394   $ (604,995)  
Level 3   30,989,133   -   -  
Total   $ 133,182,362   $ 1,394   $ (604,995)  

* Other financial instruments are foreign currency exchange contracts. Foreign currency exchange contracts
are valued at the unrealized appreciation/depreciation on the instrument.
The following is a reconciliation of investments for unobservable inputs (Level 3) used in determining fair value:

  Investments in  
  Securities  
Balance, as of August 31, 2008   $ 4,841,355  
Realized gain (loss)                       (195,253)  
Change in unrealized appreciation (depreciation)                 (1,574,142)  
Net purchases (sales)                 (1,826,790)  
Net transfers in/out of Level 3                 29,743,963  
Balance, as of May 31, 2009   $ 30,989,133  

9


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 Defined Opportunity Credit Trust

By: /s/ Donald C. Burke
Donald C. Burke
Chief Executive Officer of
BlackRock Defined Opportunity Credit Trust

Date: July 15, 2009

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Donald C. Burke
Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock Defined Opportunity Credit Trust

Date: July 15, 2009

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock Defined Opportunity Credit Trust

Date: July 15, 2009


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