OMB APPROVAL OMB Number: 3235-0578 Expires: April 30, 2010 Estimated average burden hours per response..... 10.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-22014 Pioneer Diversified High Income Trust (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Dorothy E. Bourassa, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: April 30 Date of reporting period: July 31, 2007 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 close of the first and third fiscal quarters, pursuant to Rule 30b1-5under the Investment Company Act of 1940 (17 CFR 270.30b-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 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. ss. 3507. ITEM 1. Schedule of Investments. Pioneer Diversified High Income Trust SCHEDULE OF INVESTMENTS 7/31/07 (unaudited) Principal Amount Value COLLATERIZED MORTGAGE OBLIGATIONS - 0.2% of Net Assets Diversified Financials - 0.2% 400,000 DB Master Finance LLC, 8.285%, 6/20/31 (144A) $ 406,718 TOTAL COLLATERIZED MORTGAGE OBLIGATIONS (Cost $406,113) $ 406,718 CORPORATE BONDS & NOTES - 50.2% of Net Assets Energy - 4.7% Oil & Gas Drilling - 0.2% 300,000 Skeie Drilling & Production ASA, 11.25%, 3/8/13 $ 302,250 $ 302,250 Oil & Gas Equipment & Services - 1.1% 400,000 Bristow Group, Inc., 7.5%, 9/15/17 (144A) $ 396,000 5,000,000 Norwegian Energy Co. AS, 11.0%, 7/13/10 (144A) 850,136 275,000 SemGroup L.P., 8.75%, 11/15/15 (144A) 270,875 600,000 (a) Sevan Marine ASA, 8.37%, 5/14/13 (144A) 603,000 $ 2,120,011 Integrated Oil & Gas - 0.3% 500,000 Tristan Oil, Ltd., 10.5%, 1/1/12 (144A) $ 480,000 Oil & Gas Exploration & Production - 1.0% 160,000 Berry Petroleum Co., 8.25%, 11/1/16 $ 154,400 500,000 Harvest Operations Corp., 7.875%, 10/15/11 473,750 160,000 Hilcorp Energy I L.P./Hilcorp Finance Co., 7.75%, 11 149,600 675,000 Parallel Petroleum Corp., 10.25%, 8/1/14 (144A) 675,000 225,000 PetroQuest Energy, Inc., 10.375%, 5/15/12 226,125 250,000 Quicksilver Resources, Inc., 7.125%, 4/1/16 231,875 $ 1,910,750 Oil & Gas Refining & Marketing - 0.8% 955,000 Aventine Renewable Energy Holdings, Inc., 10.0%, 4/$ 897,700 600,000 VeraSun Energy Corp., 9.375%, 6/1/17 (144A) 546,000 $ 1,443,700 Oil & Gas Storage & Transportation - 0.9% 400,000 Inergy L.P./Inergy Finance Corp., 8.25%, 3/1/16 $ 400,000 250,000 LPG International, Inc., 7.25%, 12/20/15 243,125 250,000 Targa Resources, Inc., 8.5%, 11/1/13 (144A) 277,166 550,000 Transportadora de Gas del Sur SA, 7.875%, 5/14/17 (1 496,375 400,000 Williams Partners L.P./Williams Partners Finance Cor 388,000 $ 1,804,666 Coal &Consumable Fuels - 0.4% 900,000 Massey Energy Co., 6.875%, 12/15/13 $ 793,125 Total Energy $ 8,854,502 Materials - 6.0% Commodity Chemicals - 1.1% 400,000 ARCO Chemical Co., 9.8%, 2/1/20 $ 412,000 1,750,000 Georgia Gulf Corp., 10.75%, 10/15/16 1,636,250 $ 2,048,250 Diversified Chemicals - 0.7% 110,000 Braskem SA, 11.75%, 1/22/14 (144A) $ 131,725 850,000 Ineos Group Holdings Plc, 7.875%, 2/15/16 (144A) 1,016,628 250,000 Montell Finance Co. BV, 8.1%, 3/15/27 (144A) 217,500 $ 1,365,853 Construction Materials - 0.2% 320,000 Blaze Recycling & Metals LLC / Blaze Finance Corp.,$ 315,200 Metal & Glass Containers - 0.5% 625,000 Impress Holdings BV, 9.25%, 9/15/14 (144A) $ 842,699 80,000 Vitro, SAB de CV, 9.125%, 2/1/17 (144A) 76,800 $ 919,499 Paper Packaging - 1.0% 600,000 Exopack Holding Corp., 11.25%, 2/1/14 $ 612,000 500,000 Graphic Packaging International, Inc., 9.5%, 8/15/13 500,000 750,000 U.S. Corrugated, Inc., 10.0%, 6/1/13 729,375 $ 1,841,375 Aluminum - 0.8% 700,000 Aleris International, Inc., 10.0%, 12/15/16 (144A) $ 626,500 350,000 Asia Aluminum Holdings, Ltd., 8.0%, 12/23/11 (144A) 332,500 500,000 Indalex Holding Corp., 11.5%, 2/1/14 495,000 $ 1,454,000 Diversified Metals & Mining - 0.6% 350,000 American Rock Salt Co., LLC, 9.5%, 3/15/14 $ 352,625 250,000 FMG Finance Pty., Ltd., 10.625%, 9/1/16 (144A) 286,250 500,000 (a)(bNoranda Aluminium Acquisition Corp., 9.36%, 5/15/15 475,000 75,000 PNA Group, Inc., 10.75%, 9/1/16 (144A) 80,250 $ 1,194,125 Steel - 0.0% 1,245,000 Algoma Acquisition Corp., 9.875%, 6/15/15 (144A) $ 1,176,525 50,000 Zlomrex International Finance SA, 8.5%, 2/1/14 (144A 65,705 $ 1,242,230 Forest Products - 0.3% 250,000 Ainsworth Lumber Co., Ltd., 6.75%, 3/15/14 $ 170,000 500,000 Mandra Forestry Holdings, Ltd., 12.0%, 5/15/13 (144A 491,250 $ 661,250 Paper Products - 0.2% 500,000 Bowater, Inc., 9.375%, 12/15/21 $ 440,000 Total Materials $11,481,782 Capital Goods - 3.5% Aerospace & Defense - 0.2% 300,000 TransDigm, Inc., 7.75%, 7/15/14 (144A) $ 294,000 Building Products - 0.4% 500,000 (a) Builders FirstSource, Inc., 9.61%, 2/15/12 $ 492,500 300,000 (a)(cC8 Capital SPV, Ltd., 6.64% (144A) 285,510 $ 778,010 Construction & Engineering - 0.5% 750,000 Desarrolladora Metropolitana SA de CV, 10.875%, 5/9$ 758,437 200,000 Dycom Industries, Inc., 8.125%, 10/15/15 197,000 $ 955,437 Electrical Components & Equipment - 0.4% 650,000 (c) Rede Empresas de Energia Eletrica SA, 11.125% (144A$ 679,087 Industrial Conglomerates - 1.0% 2,000,000 Intergen NV, 9.0%, 6/30/17 (144A) $ 1,970,000 Construction & Farm Machinery & Heavy Truck - 1.0% 600,000 Accuride Corp., 8.5%, 2/1/15 $ 570,000 520,000 Commercial Vehicle Group, Inc., 8.0%, 7/1/13 478,400 550,000 Greenbrier Companies, Inc., 8.375%, 5/15/15 541,750 400,000 Titan International, Inc., 8.0%, 1/15/12 408,000 $ 1,998,150 Total Capital Goods $ 6,674,684 Commercial Services & Supplies - 1.0% Diversified Commercial & Professional Services - 1.0% 350,000 FTI Consulting, Inc., 7.75%, 10/1/16 $ 343,000 425,000 (a) NCO Group, Inc., 10.23%, 11/15/13 (144A) 408,000 900,000 NCO Group, Inc., 11.875%, 11/15/14 (144A) 873,000 250,000 Park-Ohio Industries, Inc., 8.375%, 11/15/14 232,500 Total Commercial Services & Supplies $ 1,856,500 Transportation - 0.8% Airlines - 0.3% 154,114 American Airlines, Inc., 7.377%, 5/23/19 $ 140,244 500,000 (c) GOL Finance, 8.75% (144A) 476,250 $ 616,494 Marine - 0.3% 500,000 Stena AB, 7.0%, 12/1/16 $ 492,500 Railroads - 0.2% 350,000 Kansas City Southern de Mexico SA de CV, 7.625%, 12$ 350,000 Total Transportation $ 1,458,994 Automobiles & Components - 0.2% Auto Parts & Equipment - 0.2% 500,000 Cooper-Standard Automotive, Inc., 8.375%, 12/15/14 $ 435,000 Total Automobiles & Components $ 435,000 Consumer Durables & Apparel - 1.3% Homebuilding - 0.4% 315,000 Desarrolladora Homex SAB de CV, 7.5%, 9/28/15 $ 296,100 80,000 TOUSA, Inc., 10.375%, 7/1/12 45,600 500,000 William Lyon Homes, Inc., 7.5%, 2/15/14 380,000 $ 721,700 Housewares & Specialties - 0.4% 200,000 Jarden Corp., 7.5%, 5/1/17 $ 180,000 750,000 Yankee Acquisition Corp., 9.75%, 2/15/17 667,500 $ 847,500 Footwear - 0.5% 730,000 (a) Edcon Holdings Proprietary, Ltd., 9.645%, 6/15/15 ($ 849,372 Total Consumer Durables & Apparel $ 2,418,572 Consumer Services - 1.4% Casinos & Gaming - 1.4% 50,000 Codere Finance Luxembourg SA, 8.25%, 6/15/15 (144A)$ 65,020 550,000 Fontainebleau Las Vegas Holdings LLC/Fontainebleau L 474,375 275,000 Little Traverse Bay Bands of Odawa Indians, 10.25%, 275,000 50,000 Peermont Global, Ltd., 7.75%, 4/30/14 (144A) 65,020 750,000 Station Casinos, Inc., 6.625%, 3/15/18 600,000 750,000 Trump Entertainment Resorts, Inc., 8.5%, 6/1/15 631,875 650,000 Wimar Opco LLC, 9.625%, 12/15/14 (144A) 546,000 Total Consumer Services $ 2,657,290 Media - 0.8% Movies & Entertainment - 0.2% 400,000 Corporacion Interamericana de Entretenimiento SA de$ 416,000 Publishing - 0.6% 500,000 (b) AAC Group Holding Corp., 14.75%, 10/1/12 $ 510,000 600,000 TL Acquisitions, Inc., 10.5%, 1/15/15 (144A) 552,000 $ 1,062,000 Total Media $ 1,478,000 Retailing - 0.5% Distributors - 0.3% 500,000 Intcomex, Inc., 11.75%, 1/15/11 $ 510,000 Catalog Retail - 0.2% 500,000 Sally Holdings LLC, 9.25%, 11/15/14 (144A) $ 470,000 Total Retailing $ 980,000 Food & Staples Retailing - 0.4% Drug Retail - 0.1% 275,000 Duane Reade, Inc., 9.75%, 8/1/11 $ 259,875 Food Distributors - 0.3% 250,000 JBS SA, 10.5%, 8/4/16 (144A) $ 259,375 275,000 (d) SA Fabrica de Produtos Alimenticios Vigor, 9.25%, 2/ 266,750 $ 526,125 Total Food & Staples Retailing $ 786,000 Food, Beverage & Tobacco - 1.2% Brewers - 0.1% 250,000 Cerveceria Nacional Dominicana C por A, 8.0%, 3/27/$ 247,500 Agricultural Products - 0.5% 580,000 (c) Cosan SA Industria e Comercio, 8.25% (144A) $ 572,750 400,000 Marfrig Overseas, Ltd., 9.625%, 11/16/16 (144A) 407,000 $ 979,750 Packaged Foods & Meats - 0.3% 500,000 Minerva Overseas, Ltd., 9.5%, 2/1/17 (144A) $ 503,125 Tobacco - 0.3% 500,000 Alliance One International, Inc., 8.5%, 5/15/12 (14$ 492,500 Total Food, Beverage & Tobacco $ 2,222,875 Health Care Equipment & Services - 2.3% Health Care Equipment & Services - 0.4% 750,000 Accellent, Inc., 10.5%, 12/1/13 $ 720,000 Health Care Supplies - 0.2% 500,000 (a) Medical Services Co., 12.86%, 10/15/11 $ 480,000 Health Care Services - 0.8% 350,000 Rural/Metro Corp., 9.875%, 3/15/15 $ 343,000 725,000 (b) Surgical Care Affiliates, Inc., 8.875%, 7/15/15 (144 688,750 570,000 Surgical Care Affiliates, Inc., 10.0%, 7/15/17 (144A 541,500 $ 1,573,250 Health Care Facilities - 0.6% 500,000 Community Health Systems, Inc., 8.875%, 7/15/15 (14$ 485,625 420,000 Hanger Orthopedic Group, Inc., 10.25%, 6/1/14 434,700 200,000 Sun Healthcare Group, Inc., 9.125%, 4/15/15 (144A) 200,000 $ 1,120,325 Managed Health Care - 0.3% 500,000 Multiplan, Inc., 10.375%, 4/15/16 (144A) $ 490,000 Total Health Care Equipment & Services $ 4,383,575 Pharmaceuticals & Biotechnology & Life Sciences - 0.4% Biotechnology - 0.2% 400,000 Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 $ 365,000 Pharmaceuticals - 0.2% 250,000 Phibro Animal Health Corp., 10.0%, 8/1/13 (144A) $ 245,000 250,000 Warner Chilcott Corp., 8.75%, 2/1/15 243,750 $ 488,750 Total Pharmaceuticals & Biotechnology & Life Scienc$ 853,750 Banks - 1.3% Diversified Banks - 1.3% 500,000 (a)(cALB Finance BV, 9.375% $ 444,450 250,000 ATF Capital BV, 9.25%, 2/21/14 (144A) 261,250 375,000 Banco Macro SA, 8.5%, 2/1/17 (144A) 335,625 700,000 (a) Banco Macro SA, 10.6%, 6/7/12 (144A) 622,440 300,000 Petrocommerce Finance SA, 8.75%, 12/17/09 297,120 500,000 TuranAlem Finance BV, 8.5%, 2/10/15 (144A) 455,000 Total Banks $ 2,415,885 Diversified Financials - 9.0% Other Diversified Financial Services - 0.5% 1,000,000 (a) Carillon, Ltd., 20.61%, 1/10/11 (144A) $ 997,400 Consumer Finance - 0.8% 460,000 AmeriCredit Corp., 8.5%, 7/1/15 (144A) $ 441,600 500,000 KAR Holdings, Inc., 10.0%, 5/1/15 (144A) 440,000 550,000 Russian Standard Finance SA, 7.5%, 10/7/10 (144A) 511,500 $ 1,393,100 Total Diversified Financials $17,175,055 Insurance - 8.2% Insurance Brokers - 0.5% 600,000 HUB International Holdings, Inc., 10.25%, 6/15/15 ($ 516,000 500,000 USI Holdings Corp., 9.75%, 5/15/15 (144A) 475,000 $ 991,000 Multi-Line Insurance - 0.5% 1,000,000 (a) Liberty Mutual Group, Inc., 7.0%, 3/15/37 (144A) $ 907,438 100,000 Sul America Participacoes SA, 8.625%, 2/15/12 (144A) 98,750 $ 1,006,188 Reinsurance - 14.8% 2,250,000 (a) AKIBARE, 8.31%, 5/22/12 (144A) $ 2,258,775 1,500,000 (a) AKIBARE, 8.51%, 5/22/12 (144A) 1,514,250 3,500,000 (a) Australis, Ltd., 9.005%, 3/24/09 (144A) 3,510,850 1,750,000 (a) Australis, Ltd., 9.355%, 2/3/09 (144A) 1,764,350 1,000,000 (a) Calabash Re, II Ltd., 13.76%, 1/8/10 (144A) 998,000 2,000,000 (a) Calabash Re, Ltd., 13.86%, 6/1/09 (144A) 2,035,000 1,000,000 (a) Cascadia, Ltd., 8.485%, 6/13/08 (144A) 1,000,030 3,000,000 (a) Fhu-Jin, Ltd., 9.255%, 8/10/11 (144A) 3,032,730 3,750,000 (a) Foundation Re, Ltd., 9.46%, 11/24/08 (144A) 3,591,000 3,400,000 (a) Residential Reinsurance 2005, Ltd., 13.81%, 6/6/08 ( 3,198,040 1,000,000 (a) Spinnaker Capital, Ltd., 16.86%, 6/15/08 (144A) 997,400 2,000,000 (a) Successor Hurricane Industry, Ltd., 18.66%, 12/6/07 1,960,400 2,000,000 (a) Successor II, Ltd., 44.61%, 6/6/08 (144A) 2,020,400 $13,594,795 Total Insurance $15,591,983 Real Estate - 0.8% Real Estate Management & Development - 0.8% 100,000 (a) Alto Palermo SA, 10.851%, 6/11/12 (144A) $ 89,000 105,000 China Properties Group, Ltd., 9.125%, 5/4/14 (144A) 92,925 410,000 IRSA Inversiones y Representaciones SA, 8.5%, 2/2/17 364,900 1,100,000 Neo-China Group Holdings, Ltd., 9.75%, 7/23/14 (144A 1,034,000 Total Real Estate $ 1,580,825 Software & Services - 1.0% IT Consulting & Other Services - 0.2% 400 (e) MSX International UK/MXS International Business Ser$ 396,000 Data Processing & Outsourced Services - 0.5% 1,110,000 Pegasus Solutions, Inc., 10.5%, 4/15/15 (144A) $ 1,037,850 Application Software - 0.3% 500,000 Open Solutions, Inc., 9.75%, 2/1/15 (144A) $ 482,500 Total Software & Services $ 1,916,350 Technology Hardware & Equipment - 0.8% Computer Hardware - 0.6% 500,000 (a)(bCHR Intermediate Holding Corp., 12.61%, 6/1/13 (144A 498,125 870,000 Activant Solutions, Inc., 9.5%, 5/1/16 $ 783,000 Electronic Manufacturing Services - 0.2% 300,000 Cia de Transporte de Energia Electrica de Alta Tens$ 279,000 70,000 Sanmina-SCI Corp., 6.75%, 3/1/13 61,600 $ 340,600 Total Technology Hardware & Equipment $ 1,123,600 Semiconductors & Semiconductor Equipment - 0.8% Semiconductors - 0.8% 1,000,000 Freescale Semiconductor, Inc., 8.875%, 12/15/14 (14$ 912,500 100,000 (a) Freescale Semiconductor, Inc., 9.235%, 12/15/14 (144 91,750 500,000 Freescale Semiconductor, Inc., 10.125%, 12/15/16 (14 440,000 Total Semiconductors & Semiconductor Equipment $ 1,444,250 Telecommunication Services - 3.9% Alternative Carriers - 0.5% 1,000,000 PAETEC Holding Corp., 9.5%, 7/15/15 (144A) $ 955,000 Integrated Telecommunication Services - 1.0% 1,200,000 GC Impsat Holdings I Plc, 9.875%, 2/15/17 (144A) $ 1,140,000 142,000 Tele Norte Leste Participacoes SA, 8.0%, 12/18/13 148,390 500,000 Windstream Corp., 8.625%, 8/1/16 506,250 $ 1,794,640 Wireless Telecommunication Services - 2.4% 910,000 Broadview Networks Holdings, Inc., 11.375%, 9/1/12 $ 919,100 500,000 Cell C Property, Ltd., 11.0%, 7/1/15 (144A) 441,250 500,000 Cricket Communications, Inc., 9.375%, 11/1/14 (144A) 493,125 150,000 Digicel, Ltd., 9.25%, 9/1/12 (144A) 151,500 500,000 (a) Hellas Telecommunications Luxembourg II, 10.209%, 1/ 674,159 850,000 (d) Intelsat Intermediate Holding Co., Ltd., 0.0%, 2/1/1 667,250 1,330,000 True Move Co., Ltd., 10.375%, 8/1/14 (144A) 1,301,738 $ 4,648,122 Total Telecommunication Services $ 7,397,762 Utilities - 0.1% Electric Utilities - 0.1% 250,000 Mirant JPSCo. Finance, Ltd., 11.0%, 7/6/16 (144A) $ 270,000 Total Utilities $ 270,000 TOTAL CORPORATE BONDS & NOTES (Cost $99,189,761) $95,457,234 CONVERTIBLE BONDS & NOTES - 0.2% of Net Assets Real Estate - 0.2% Retail Real Estate Investment Trust - 0.2% 400,000 General Growth Properties, Inc., 3.98%, 4/15/27 (14$ 361,000 TOTAL CONVERTIBLE BONDS & NOTES (Cost $384,160) $ 361,000 FLOATING RATE LOAN INTERESTS - 34.5% of Net Assets(f) Energy - 1.0% Oil & Gas Exploration & Production - 1.0% 997,500 Concho Resources, Inc., Second Lien Term Loan, 9.07$ 985,031 1,000,000 W&T Offshore, Inc., Tranche B Term Loan, 2.25%, 5/26 987,500 Total Energy $ 1,972,531 Materials - 2.8% Paper Packaging - 0.7% 1,500,000 Georgia-Pacific LLC, Term B Loan, 7.09% - 7.11%, 12$ 1,420,981 Forest Products - 0.8% 1,500,000 Ainsworth Lumber Co. Ltd., Term Loan, 8.375%, 6/26/$ 1,462,500 Steel - 1.3% 1,850,000 Algoma Steel, Inc., Term Loan, 2.5%, 6/20/13 $ 1,757,500 650,000 Niagara Corp., Term Loan B, 10.36%, 6/29/14 651,625 $ 2,409,125 Total Materials $ 5,292,606 Capital Goods - 1.0% Construction & Farm Machinery & Heavy Trucks - 1.0% 2,000,000 Rental Service Corp., Second Lien Initial Term Loan$ 1,970,000 Total Capital Goods $ 1,970,000 Commercial Services & Supplies - 2.2% Environmental & Facilities Services - 1.3% 1,250,000 Synagro Technologies, Inc., First Lien Term Loan, 2$ 1,200,000 1,225,000 Waste Services, Inc., Tranche E Term Loan , 2.5%, 3/ 1,188,250 $ 2,388,250 Logistics-.09% 439,482 Louis No. 1 PLC, Pre-Funded LC Loan, 7.86%, 11/4/13$ 442,366 1,341,318 Louis No. 1 PLC, Term Loan, 7.82%, 11/4/13 1,350,121 $ 1,792,487 Total Commercial Services & Supplies $ 4,180,737 Consumer Durables & Apparel - 1.5% Homebuilding - 1.0% 2,000,000 LandSource Communities Development LLC, Second Lien$ 1,856,666 Housewares & Specialties - 0.5% 1,000,000 Yankee Candle Company, Inc., Term Loan, 7.36%, 2/6/$ 950,000 Total Consumer Durables & Apparel $ 2,806,666 Consumer Services - 1.6% Casinos & Gaming - 1.6% 1,000,500 Fontainebleau Las Vegas, LLC/Fontainebleau Las Vega$ 963,607 833,350 New World Gaming Partners, Term Loan, 2.5%, 7/16/04 810,433 1,000,000 New World Gaming Partners, Term Loan, 5.5%, 7/16/04 965,000 250,000 Riviera Holdings Corp., Term Loan, 7.36%, 6/8/14 243,125 Total Consumer Services $ 2,982,165 Media - 2.9% Broadcasting & Cable Television - 1.0% 2,000,000 Charter Communications Operating, LLC, New Term Loa$ 1,906,000 Movies & Entertainment - 0.5% 1,000,000 Lodgenet Entertainment Corp., Closing Date Term Loa$ 979,167 Publishing - 1.5% 1,250,000 Canwest Mediaworks Limited Partnership, Credit D Te$ 1,225,000 1,741,219 Riverdeep Interactive Learning USA, Inc., Term Loan, 1,688,983 $ 2,913,983 Total Media $ 5,799,150 Retailing - 1.0% Apparel, Accessories & Luxury Goods - 1.0% 2,000,000 Hanesbrands, Inc., Term Loan B, 7.105%, 9/5/13 $ 1,939,376 Total Retailing $ 1,939,376 Food, Beverage & Tobacco - 0.6% Tobacco - 0.6% 1,103,448 Alliance One International, Inc./Intabex Netherland$ 1,106,207 Total Food, Beverage & Tobacco $ 1,106,207 Household & Personal Products - 1.8% Household Products - 1.8% 2,000,000 Huish Detergents, Inc., Second Lien Term Loan, 9.57$ 1,860,000 1,500,000 Samsonite Corp., Term Loan, 2.25%, 12/20/13 1,492,188 Total Household & Personal Products $ 3,352,188 Health Care Equipment & Services - 4.8% Health Care Equipment & Services - 0.9% 1,750,000 Talecris Biotherapeutics Holdings Corp., First Lien$ 1,717,188 $ 1,717,188 Health Care Supplies - 0.5% 500,000 IM US Holdings, LLC (Inverness Medical), First Lien$ 477,500 600,000 IM US Holdings, LLC (Inverness Medical), Second Lien 585,000 $ 1,062,500 Health Care Services - 0.8% 1,500,000 HealthSouth Corp., Term Loan, 7.82%, 3/10/13 $ 1,463,720 Health Care Facilities - 2.6% 938,128 Community Health Systems, Inc., Term Loan, 7.57%, 7$ 896,750 1,750,000 Hanger Orthopedic Group, Inc., Tranche B Term Loan, 1,741,250 1,000,000 HCA, Inc., Tranche B Term Loan, 7.61%, 11/18/13 967,167 499,674 Psychiatric Solutions, Inc., Term Loan, 7.09% - 7.13 499,049 160,919 Sun Healthcare Group, Inc., Synthetic LC Loan, 2.0%, 159,713 712,644 Sun Healthcare Group, Inc., Term Loan, 2.0%, 4/19/14 707,299 $ 4,971,228 Total Health Care Equipment & Services $ 9,214,636 Diversified Financials - 3.1% Other Diversified Financial Services - 0.8% 1,500,000 J.G. Wentworth LLC, Second Lien Term Loan, 10.36%, $ 1,481,250 $ 3,273,737 Specialized Finance - 0.5% 897,740 Ace Cash Express, Inc., Term Loan, 8.34% - 8.39%, 1$ 855,097 Consumer Finance - 1.4% 997,494 Collect Acquisition Corp., Facility Term Loan B, 8.$ 987,519 1,750,000 Dollar Financial Corp., Canadian Borrower Term Loan, 1,700,781 $ 2,688,300 Asset Management & Custody Banks - 0.4% 750,000 Asset Acceptance Capital Corp., Tranche B Term Loan$ 746,250 Total Diversified Financials $ 7,563,384 Insurance - 2.0% Insurance Brokers - 1.2% 408,497 HUB International Holdings, Inc., Initial Term Loan$ 387,051 2,000,000 USI Holdings Corp., Tranche B Term Loan, 8.11%, 5/5/ 1,900,000 $ 2,287,051 Multi-Line Insurance - 0.8% 500,000 AmWins Group, Inc., Initial Term Loan, 7.82% - 7.84$ 471,250 1,000,000 AmWins Group, Inc., Second Lien Initial Term Loan, 1 942,500 $ 1,413,750 Total Insurance $ 3,700,801 Software & Services - 1.8% Computer Storage & Peripherals - 1.0% 1,994,987 SunGard Data Systems Inc., Term Loan B, 7.356%, 2/1$ 1,920,383 1,496,250 Vangent, Inc., Term Loan, 7.61% - 7.62%, 2/14/13 1,488,769 Total Software & Services $ 3,409,152 Technology Hardware & Equipment - 1.0% Electronic Equipment Manufacturers - 1.0% 2,000,000 H3C Holdings Ltd., Tranche B Term Loan, 3.0%, 9/28/$ 2,005,000 Total Technology Hardware & Equipment $ 2,005,000 Semiconductors & Semiconductor Equipment - 0.5% Semiconductors - 0.5% 1,000,000 Freescale Semiconductor, Inc., Term Loan, 7.11%, 11$ 922,386 Total Semiconductors & Semiconductor Equipment $ 922,386 Telecommunication Services - 2.1% Alternative Carriers - 0.7% 1,250,000 PAETEC Holding Corp., Replacement Term Loan, 2.5%, $ 1,229,166 Wireless Telecommunication Services - 1.4% 1,000,000 Cricket Communications, Inc., Term Loan B, 7.36%, $ 973,500 1,750,000 MetroPCS Wireless, Inc., New Tranche B Term Loan, 7. 1,706,250 $ 2,679,750 Total Telecommunication Services $ 3,908,916 Utilities - 2.8% Independent Power Producers & Energy Traders - 2.8% 1,995,000 Calpine Corp., First Priority Term Loan, 7.59%, 3/2$ 1,938,059 187,926 Mach Gen, LLC, First Lien Synthetic LC Loan, 7.36%, 182,382 1,807,533 Mach Gen, LLC, First Lien Term Loan B, 7.36%, 2/22/1 1,754,210 418,256 NRG Energy, Inc., Credit-Linked Deposit Loan, 7.11%, 405,011 1,007,483 NRG Energy, Inc., Term Loan, 7.11%, 2/1/13 975,579 Total Utilities $ 5,255,241 TOTAL FLOATING RATE LOAN INTERESTS (Cost $67,596,516) $65,588,655 Shares WARRANTS - 0.0% of Net Assets (g) Real Estate - 0.0% Real Estate Management & Development - 0.0% 750,000 Neo-China Group Holdings, Ltd., Expires 7/22/12 $ 61,332 TOTAL WARRANTS (Cost $17,012) $ 61,332 TEMPORARY CASH INVESTMENTS - 24.7% of Net Assets Commercial Paper - 24.7% 9,410,000 AIG Funding, Inc., 5.33%, 8/1/07 $ 9,410,000 9,410,000 Banco Bilbao Vizcaya, 5.35%, 8/1/07 9,410,000 4,090,000 Citigroup Funding, Inc., 5.33%, 8/1/07 4,090,000 9,410,000 DZ Bank AG Grand Cayman, 5.35%, 8/1/07 (144A) 9,410,000 5,320,000 Rabobank U.S.A. Financial, 5.32%, 8/1/07 5,320,000 9,410,000 Societe Generale North America, 5.34%, 8/1/07 9,410,000 TOTAL TEMPORARY CASH INVESTMENTS (Cost $47,050,000) $47,050,000 TOTAL INVESTMENTS IN SECURITIES - 109.8% (Cost $214,643,562) (h) $208,924,939 OTHER ASSETS AND LIABILITIES - (9.8)% $(18,593,413) PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (0.0)% $- NET ASSETS APPLICABLE TO COMMON SHAREOWNERS - 100.0$190,331,526 (144A) Security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At July 31, 2007, the value of these securities amounted to $83,168,698 or 43.7% of total net assets applicable to common shareowners. Floating rate note. The rate shown is the rate at July 31, 2007. (a) Floating rate note. The rate shown is the rate at July 31, 2007. (b) Represents a pay-in-kind security which may pay interest in additional principal. (c) Security is a perpetual bond and has no definite maturity date. (d) Debt obligation initially issued at one coupon which converts to a higher coupon at a specific date. The rate shown is the rate at July 31, 2007. (e) Security is priced as a unit. (f) Floating rate loan interests in which the Trust invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major United States banks, (iii) the certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at July 31, 2007. (g) Non-income producing. (h) At July 31, 2007, the net unrealized gain on investments based on cost for federal income tax purposes of $214,643,562 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 170,318 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (5,888,941) Net unrealized gain $(5,718,623) For financial reporting purposes net unrealized loss was $5,718,623 and cost of investments aggregated $214,643,562 ITEM 2. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on their evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 3. EXHIBITS. (a) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] 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) Pioneer Diversified High Income Trust By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date September 28, 2007 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/ John F. Cogan, Jr. John F. Cogan, Jr., President Date September 28, 2007 By (Signature and Title)* /s/ Vincent Nave Vincent Nave, Treasurer Date September 28, 2007 * Print the name and title of each signing officer under his or her signature.