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: January 31, 2008 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 1/31/08 (unaudited) Principal Amount USD ($) Value COLLATERALIZED MORTGAGE OBLIGATIONS - 0.2% of Net Assets Diversified Financials - 0.2% 400,000 DB Master Finance LLC, 8.285%, 6/20/31 (144A) $340,000 TOTAL COLLATERIZED MORTGAGE OBLIGATIONS (Cost $406,070) $340,000 CORPORATE BONDS & NOTES - 64.9% of Net Assets Energy - 4.7% Oil & Gas Drilling - 0.1% 300,000 Skeie Drilling & Production ASA, 11.25%, 3/8/13 ($283,500 Oil & Gas Equipment & Services - 1.4% 400,000 Bristow Group, Inc., 7.5%, 9/15/17 (144A) $404,000 350,000 Complete Production Services, Inc., 8.0%, 12/15/1$339,500 NOK 5,000,000 Norwegian Energy Co. AS, 11.0%, 7/13/10 (144A) $882,142 275,000 SemGroup L.P., 8.75%, 11/15/15 (144A) $257,125 600,000 (a) Sevan Marine ASA, 7.438%, 5/14/13 (144A) $582,000 $2,464,767 Integrated Oil & Gas - 0.3% 500,000 Tristan Oil, Ltd., 10.5%, 1/1/12 (144A) $470,000 Oil & Gas Exploration & Production - 0.9% 500,000 Harvest Operations Corp., 7.875%, 10/15/11 $452,500 160,000 Hilcorp Energy I L.P./Hilcorp Finance Co., 7.75%,$153,200 675,000 Parallel Petroleum Corp., 10.25%, 8/1/14 (144A) $661,500 225,000 PetroQuest Energy, Inc., 10.375%, 5/15/12 $228,375 150,000 Quicksilver Resources, Inc., 7.125%, 4/1/16 $145,500 $1,641,075 Oil & Gas Refining & Marketing - 0.7% 955,000 Aventine Renewable Energy Holdings, Inc., 10.0%, $797,425 600,000 VeraSun Energy Corp., 9.375%, 6/1/17 (144A) $477,000 $1,274,425 Oil & Gas Storage & Transportation - 0.8% 490,000 Inergy L.P./Inergy Finance Corp., 8.25%, 3/1/16 $499,800 250,000 LPG International, Inc., 7.25%, 12/20/15 $245,000 800,000 Transportadora de Gas del Sur SA, 7.875%, 5/14/17$688,000 $1,432,800 Coal & Consumable Fuels - 0.5% 900,000 Massey Energy Co., 6.875%, 12/15/13 $857,250 Total Energy $8,423,817 Materials - 6.6% Commodity Chemicals - 0.8% 400,000 ARCO Chemical Co., 9.8%, 2/1/20 $364,000 1,750,000 Georgia Gulf Corp., 10.75%, 10/15/16 $1,128,750 $1,492,750 Diversified Chemicals - 1.0% 110,000 Braskem SA, 11.75%, 1/22/14 (144A) $132,000 EURO 1,175,000 Ineos Group Holdings Plc, 7.875%, 2/15/16 (144A) $1,243,892 650,000 Montell Finance Co. BV, 8.1%, 3/15/27 (144A) $500,500 $1,876,392 Construction Materials - 0.2% 320,000 Blaze Recycling & Metals LLC/Blaze Finance Corp.,$288,000 Metal & Glass Containers - 0.5% EURO 625,000 Impress Holdings BV, 9.25%, 9/15/14 (144A) $818,959 80,000 Vitro, S.A.B. de CV, 9.125%, 2/1/17 $69,800 $888,759 Paper Packaging - 0.9% 600,000 Exopack Holding Corp., 11.25%, 2/1/14 $562,500 500,000 Graphic Packaging International, Inc., 9.5%, 8/15$471,250 750,000 U.S. Corrugated, Inc., 10.0%, 6/1/13 $600,000 $1,633,750 Aluminum - 0.7% 700,000 Aleris International, Inc., 10.0%, 12/15/16 $491,750 350,000 Asia Aluminum Holdings, Ltd., 8.0%, 12/23/11 (144$322,875 500,000 Indalex Holding Corp., 11.5%, 2/1/14 $441,250 $1,255,875 Diversified Metals & Mining - 1.2% 350,000 American Rock Salt Co., LLC, 9.5%, 3/15/14 $361,375 250,000 FMG Finance Pty., Ltd., 10.625%, 9/1/16 (144A) $283,750 1,085,000 Industrias Metalurgicas Pescarmona SA, 11.25%, 10$1,041,600 500,000 (a)(Noranda Aluminium Acquisition Corp., 8.738%, 5/15$380,000 75,000 PNA Group, Inc., 10.75%, 9/1/16 $67,500 $2,134,225 Steel - 0.9% 1,245,000 Algoma Acquisition Corp., 9.875%, 6/15/15 (144A) $996,000 EURO 600,000 Bulgaria Steel Finance BV, 12.0%, 5/4/13 $586,319 EURO 50,000 Zlomrex International Finance SA, 8.5%, 2/1/14 (1$48,120 $1,630,439 Forest Products - 0.4% 250,000 Ainsworth Lumber Co., Ltd., 7.25%, 10/1/12 $157,500 500,000 Mandra Forestry Holdings, Ltd., 12.0%, 5/15/13 (1$550,000 $707,500 Total Materials $11,907,690 Capital Goods - 2.6% Building Products - 0.4% 500,000 (a) Builders FirstSource, Inc., 9.119%, 2/15/12 $406,875 300,000 (a)(C8 Capital SPV, Ltd., 6.64% (144A) $271,275 $678,150 Construction & Engineering - 0.1% 200,000 Dycom Industries, Inc., 8.125%, 10/15/15 $196,750 Electrical Components & Equipment - 0.3% 650,000 (c) Rede Empresas de Energia Eletrica SA, 11.125% (14$623,187 Construction & Farm Machinery & Heavy Trucks - 1.8% 600,000 Accuride Corp., 8.5%, 2/1/15 $474,000 520,000 Commercial Vehicle Group, Inc., 8.0%, 7/1/13 $440,050 500,000 Esco Corp., 8.625%, 12/15/13 (144A) $477,500 1,200,000 Greenbrier Companies, Inc., 8.375%, 5/15/15 $1,089,000 500,000 (d) Stanadyne Corp., 0.0%, 2/15/15 $345,000 400,000 Titan International, Inc., 8.0%, 1/15/12 $375,000 $3,200,550 Total Capital Goods $4,698,637 Commercial Services & Supplies - 1.1% Trading Companies & Distributors - 0.1% 125,000 United Rentals North America, Inc., 6.5%, 2/15/12$115,000 Diversified Commercial & Professional Services - 1.0% 350,000 FTI Consulting, Inc., 7.75%, 10/1/16 $362,250 425,000 (a) NCO Group, Inc., 9.744%, 11/15/13 $408,000 900,000 NCO Group, Inc., 11.875%, 11/15/14 $837,000 250,000 Park-Ohio Industries, Inc., 8.375%, 11/15/14 $203,125 $1,810,375 Total Commercial Services & Supplies $1,925,375 Transportation - 0.5% Airlines - 0.3% 147,371 American Airlines, Inc., 7.377%, 5/23/19 $133,370 500,000 (c) GOL Finance, 8.75% (144A) $448,750 $582,120 Railroads - 0.2% 350,000 Kansas City Southern de Mexico, 7.625%, 12/1/13 $337,750 Total Transportation $919,870 Automobiles & Components - 0.6% Auto Parts & Equipment - 0.6% 330,000 Allison Transmission, Inc., 11.0%, 11/1/15 (144A)$280,500 500,000 (b) Allison Transmission, Inc., 11.25%, 11/1/15 (144A$388,536 500,000 Cooper-Standard Automotive, Inc., 8.375%, 12/15/1$377,500 Total Automobiles & Components $1,046,536 Consumer Durables & Apparel - 1.3% Homebuilding - 0.6% 315,000 Desarrolladora Homex S.A.B. de CV, 7.5%, 9/28/15 $306,337 750,000 Desarrolladora Metropolitana SA de CV, 10.875%, 5$758,437 $1,064,774 Housewares & Specialties - 0.4% 200,000 Jarden Corp., 7.5%, 5/1/17 $171,000 750,000 Yankee Acquisition Corp., 9.75%, 2/15/17 $611,250 $782,250 Footwear - 0.3% EURO 730,000 (a) Edcon Holdings Proprietary, Ltd., 10.448%, 6/15/1$545,825 Total Consumer Durables & Apparel $2,392,849 Consumer Services - 1.3% Casinos & Gaming - 1.3% EURO 50,000 Codere Finance Luxembourg SA, 8.25%, 6/15/15 (144$65,517 550,000 Fontainebleau Las Vegas Holdings LLC/Fontainebleau Las Vegas Capital Corp., 10.25%, 6/15/15 (144A) $412,500 275,000 Little Traverse Bay Bands of Odawa Indians, 10.25$275,688 EURO 50,000 Peermont Global, Ltd., 7.75%, 4/30/14 (144A) $59,594 750,000 Station Casinos, Inc., 6.625%, 3/15/18 $481,875 750,000 Trump Entertainment Resorts, Inc., 8.5%, 6/1/15 $540,000 EURO 405,000 Unibet Group Plc, 9.7%, 12/21/10 $599,645 Total Consumer Services $2,434,819 Media - 0.8% Movies & Entertainment - 0.2% 400,000 Corporacion Interamericana de Entretenimiento SA de CV, 8.875%, 6/14/15 (144A) $416,000 Publishing - 0.6% 536,875 (b) AAC Group Holding Corp., 14.75%, 10/1/12 $467,081 600,000 TL Acquisitions, Inc., 10.5%, 1/15/15 (144A) $546,000 $1,013,081 Total Media $1,429,081 Retailing - 0.8% Distributors - 0.5% 500,000 Intcomex, Inc., 11.75%, 1/15/11 $497,500 500,000 KAR Holdings, Inc., 10.0%, 5/1/15 (144A) $417,500 $915,000 Specialty Stores - 0.3% 500,000 Sally Holdings LLC, 9.25%, 11/15/14 $472,500 Total Retailing $1,387,500 Food & Staples Retailing - 0.4% Drug Retail - 0.1% 275,000 Duane Reade, Inc., 9.75%, 8/1/11 $239,250 Food Distributors - 0.3% 250,000 JBS SA, 10.5%, 8/4/16 (144A) $232,500 275,000 (d) SA Fabrica de Produtos Alimenticios Vigor, 9.25%,$269,156 $501,656 Total Food & Staples Retailing $740,906 Food, Beverage & Tobacco - 1.1% Brewers - 0.1% 189,000 Cerveceria Nacional Dominicana C por A, 8.0%, 3/2$190,890 Agricultural Products - 0.5% 580,000 (c) Cosan SA Industria e Comercio, 8.25% (144A) $526,350 400,000 Marfrig Overseas, Ltd., 9.625%, 11/16/16 (144A) $386,000 $912,350 Packaged Foods & Meats - 0.2% 500,000 Minerva Overseas, Ltd., 9.5%, 2/1/17 (144A) $460,000 Tobacco - 0.3% 500,000 Alliance One International, Inc., 8.5%, 5/15/12 $465,000 Total Food, Beverage & Tobacco $2,028,240 Health Care Equipment & Services - 2.2% Health Care Equipment & Services - 0.3% 750,000 Accellent, Inc., 10.5%, 12/1/13 $592,500 Health Care Supplies - 0.3% 500,000 (a) Medical Services Co., 11.758%, 10/15/11 $452,500 Health Care Services - 0.8% 350,000 Rural/Metro Corp., 9.875%, 3/15/15 $339,500 725,000 (b) Surgical Care Affiliates, Inc., 8.875%, 7/15/15 ($616,250 570,000 Surgical Care Affiliates, Inc., 10.0%, 7/15/17 (1$484,500 $1,440,250 Health Care Facilities - 0.5% 500,000 Community Health Systems, Inc., 8.875%, 7/15/15 $503,125 420,000 Hanger Orthopedic Group, Inc., 10.25%, 6/1/14 $428,400 $931,525 Managed Health Care - 0.3% 500,000 Multiplan, Inc., 10.375%, 4/15/16 (144A) $465,000 Total Health Care Equipment & Services $3,881,775 Pharmaceuticals & Biotechnology & Life Sciences - 0.4% Biotechnology - 0.2% 400,000 Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 $308,000 Pharmaceuticals - 0.2% 250,000 Phibro Animal Health Corp., 10.0%, 8/1/13 (144A) $232,500 150,000 Warner Chilcott Corp., 8.75%, 2/1/15 $153,000 $385,500 Total Pharmaceuticals & Biotechnology & Life Scie$693,500 Banks - 1.2% Diversified Banks - 1.2% 500,000 (a)(ALB Finance BV, 9.375% $367,500 250,000 ATF Capital BV, 9.25%, 2/21/14 (144A) $252,500 375,000 Banco Macro SA, 8.5%, 2/1/17 $321,563 700,000 (a) Banco Macro SA, 10.75%, 6/7/12 $525,875 300,000 Petrocommerce Finance SA, 8.75%, 12/17/09 $295,500 500,000 TuranAlem Finance BV, 8.5%, 2/10/15 (144A) $443,150 Total Banks $2,206,088 Diversified Financials - 12.2% Other Diversified Financial Services - 1.9% 2,500,000 (a) Blue Fin, Ltd., 9.02% 4/10/12 (144A) $2,512,500 1,000,000 (a) Carillon, Ltd., 20.241%, 1/10/11 (144A) $1,034,900 $3,547,400 Specialized Finance - 9.3% 3,500,000 (a) Australis, Ltd., 8.528%, 3/24/09 (144A) $3,505,250 3,000,000 (a) Australis, Ltd., 8.878%, 2/3/09 (144A) $3,017,700 2,000,000 (a) Calabash Re, Ltd., 13.53%, 6/1/09 (144A) $2,080,000 1,000,000 (a) Calabash Re II, Ltd., 13.391%, 1/8/10 (144A) $1,020,100 5,000,000 (a) Cascadia, Ltd., 8.271%, 6/13/08 (144A) $5,002,000 2,000,000 (a) Successor II, Ltd., 44.4%, 6/6/08 (144A) $2,157,000 $16,782,050 Consumer Finance - 0.5% 460,000 AmeriCredit Corp., 8.5%, 7/1/15 (144A) $334,650 550,000 Russian Standard Finance SA, 7.5%, 10/7/10 (144A)$508,750 $843,400 Investment Banking & Brokerage - 0.5% 965,000 (b) LVB Acquisition Merger Sub, Inc., 10.375%, 10/15/$924,789 Total Diversified Financials $22,097,639 Insurance - 17.8% Insurance Brokers - 0.5% 600,000 HUB International Holdings, Inc., 10.25%, 6/15/15$456,000 500,000 USI Holdings Corp., 9.75%, 5/15/15 (144A) $390,000 $846,000 Multi-Line Insurance - 0.5% 1,000,000 (a) Liberty Mutual Group, Inc., 7.0%, 3/15/37 (144A) $883,950 65,000 Sul America Participacoes SA, 8.625%, 2/15/12 (14$66,381 $950,331 Property & Casualty Insurance - 0.6% 625,000 (a) AMBAC Financial Group, Inc., 6.15%, 2/15/37 $282,250 900,000 (a) MBIA Insurance Corp., 14.0%, 1/15/33 (144A) $841,500 $1,123,750 Reinsurance - 16.2% 2,250,000 (a) AKIBARE, 7.965%, 5/22/12 (144A) $2,272,275 1,500,000 (a) AKIBARE, 8.165%, 5/22/12 (144A) $1,515,300 3,000,000 (a) Atlantic & Western Re, Ltd., 10.979%, 1/9/09 (144$3,031,800 EURO 1,500,000 (a) Atlas Reinsurance Plc, 14.953%, 1/10/11 (144A) $2,220,906 3,000,000 (a) Fhu-Jin, Ltd., 8.778%, 8/10/11 (144A) $3,060,000 3,750,000 (a) Foundation Re, Ltd., 9.005%, 11/24/08 (144A) $3,670,125 1,000,000 (a) GlobeCat, Ltd., 10.91%, 1/2/13 (144A) $1,002,200 350,000 (a) GlobeCat, Ltd., 14.16%, 1/2/13 (144A) $349,510 EURO 1,500,000 (a) Green Valley, Ltd., 8.376%, 1/10/11 (144A) $2,234,898 1,000,000 (a) Newton Re, Ltd., 9.629%, 12/24/10 (144A) $1,000,100 1,000,000 (a) Newton Re, Ltd., 11.929%, 12/24/10 (144A) $995,200 2,500,000 (a) Redwood Capital X, Ltd., 14.08%, 1/9/09 (144A) $2,500,250 2,000,000 (a) Redwood Capital X, Ltd., 18.08%, 1/9/09 (144A) $1,999,400 2,900,000 (a) Residential Reinsurance 2005, Ltd., 13.574%, 6/6/$2,898,550 500,000 (a) Residential Reinsurance 2006, Ltd., 15.124%, 6/5/$509,350 $29,259,864 Total Insurance $32,179,945 Real Estate - 0.7% Real Estate Management & Development - 0.7% 100,000 (a) Alto Palermo SA, 11.0%, 6/11/12 (144A) $80,280 105,000 China Properties Group, Ltd., 9.125%, 5/4/14 (144$77,175 410,000 IRSA Inversiones y Representaciones SA, 8.5%, 2/2$333,637 1,100,000 Neo-China Group Holdings, Ltd., 9.75%, 7/23/14 (1$825,000 Total Real Estate $1,316,092 Software & Services - 1.6% IT Consulting & Other Services - 0.2% 400 (e) MSX International UK/MXS International Business Services FR/MXS International GmbH, 12.5%, 4/1/12 (144$336,000 Data Processing & Outsourced Services - 1.2% 1,440,000 First Data Corp., 9.875%, 9/24/15 (144A) $1,274,400 1,110,000 Pegasus Solutions, Inc., 10.5%, 4/15/15 (144A) $932,400 $2,206,800 Application Software - 0.2% 500,000 Open Solutions, Inc., 9.75%, 2/1/15 (144A) $427,500 Total Software & Services $2,970,300 Technology Hardware & Equipment - 0.6% Computer Hardware - 0.4% 870,000 Activant Solutions, Inc., 9.5%, 5/1/16 $734,063 Electronic Manufacturing Services - 0.2% 300,000 Cia de Transporte de Energia Electrica de Alta Tension SA, 8.875%, 12/15/16 (144A) $261,000 70,000 Sanmina-SCI Corp., 6.75%, 3/1/13 $60,550 $321,550 Total Technology Hardware & Equipment $1,055,613 Semiconductors & Semiconductor Equipment - 0.6% Semiconductors - 0.6% 1,000,000 (b) Freescale Semiconductor, Inc., 9.125%, 12/15/14 $757,500 500,000 Freescale Semiconductor, Inc., 10.125%, 12/15/16 $356,250 Total Semiconductors & Semiconductor Equipment $1,113,750 Telecommunication Services - 4.3% Alternative Carriers - 0.5% 1,000,000 PAETEC Holding Corp., 9.5%, 7/15/15 (144A) $932,500 Integrated Telecommunication Services - 1.0% 1,200,000 GC Impsat Holdings I Plc, 9.875%, 2/15/17 (144A) $1,156,500 142,000 Tele Norte Leste Participacoes SA, 8.0%, 12/18/13$149,278 500,000 Windstream Corp., 8.625%, 8/1/16 $517,500 $1,823,278 Wireless Telecommunication Services - 2.8% 910,000 Broadview Networks Holdings, Inc., 11.375%, 9/1/1$900,900 500,000 Cell C Property, Ltd., 11.0%, 7/1/15 (144A) $478,750 500,000 Cricket Communications, Inc., 9.375%, 11/1/14 (14$455,000 150,000 Digicel, Ltd., 9.25%, 9/1/12 (144A) $152,063 EURO 500,000 (a) Hellas Telecommunications Luxembourg II, 10.576%,$580,212 850,000 (d) Intelsat Intermediate Holding Co., Ltd., 0.0%, 2/$697,000 400,000 Kabel Deutschland GmbH, 10.625%, 7/1/14 $405,000 1,330,000 True Move Co., Ltd., 10.375%, 8/1/14 (144A) $1,407,760 $5,076,685 Total Telecommunication Services $7,832,463 Utilities - 1.5% Electric Utilities - 1.3% 2,000,000 Intergen NV, 9.0%, 6/30/17 (144A) $2,085,000 250,000 Mirant JPSCo. Finance, Ltd., 11.0%, 7/6/16 (144A)$266,875 $2,351,875 Independent Power Producers & Energy Traders - 0.2% 390,000 Texas Competitive Electric Holdings Co. LLC, 10.2$383,175 Total Utilities $2,735,050 TOTAL CORPORATE BONDS & NOTES (Cost $125,448,762) $117,417,535 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 ($318,500 TOTAL CONVERTIBLE BONDS & NOTES (Cost $384,160) $318,500 FLOATING RATE LOAN INTERESTS - 32.5% of Net Assets (f) Energy - 0.9% Oil & Gas Exploration & Production - 0.9% 559,500 Concho Resources, Inc., Second Lien Term Loan, 9.$549,709 992,857 W&T Offshore, Inc., Tranche B Term Loan, 7.45%, 5$982,929 Total Energy $1,532,638 Materials - 2.6% Paper Packaging - 0.7% 1,492,386 Georgia-Pacific LLC, Term Loan B, 6.948% - 7.474%$1,381,390 Steel - 1.1% 1,310,931 Algoma Steel, Inc., Term Loan, 8.09%, 6/20/13 $1,222,443 895,500 Niagara Corp., Term Loan, 6.819% - 10.129%, 6/29/$788,040 $2,010,483 Forest Products - 0.8% 1,500,000 Ainsworth Lumber Co., Ltd., Term Loan, 7.819%, 6/$1,395,000 Total Materials $4,786,873 Capital Goods - 2.0% Construction & Farm Machinery & Heavy Trucks - 1.6% 1,000,000 Accuride Corp., Term Loan, 8.5%, 1/31/12 $964,375 2,000,000 Rental Service Corp., Second Lien Initial Term Lo$1,960,000 $2,924,375 Diversified Commercial & Professional Services - 0.4% 746,250 Asset Acceptance Capital Corp., Tranche B Term Lo$716,400 Total Capital Goods $3,640,775 Commercial Services & Supplies - 1.3% Environmental & Facilities Services - 1.3% 1,243,750 Synagro Technologies, Inc., First Lien Term Loan,$1,106,938 1,223,109 Waste Services, Inc., Tranche E Term Loan, 8.05%,$1,149,723 Total Commercial Services & Supplies $2,256,661 Consumer Durables & Apparel - 1.0% Homebuilding - 0.6% 2,000,000 LandSource Communities Development LLC, Second Lien Term Loan, 9.86%, 2/27/14 $1,045,000 Housewares & Specialties - 0.4% 925,583 Yankee Candle Company, Inc., Term Loan, 5.29% - 6$838,810 Total Consumer Durables & Apparel $1,883,810 Consumer Services - 1.6% Casinos & Gaming - 1.6% 1,000,000 (g) Fontainebleau Las Vegas, LLC/Fontainebleau Las Vegas II, LLC, Intial Term Loan, 8.948%, 6/6/14 $895,000 166,667 Gateway Casinos & Entertainment, First Lien Delayed Draw Term Loan, 9.0%, 9/30/14 $147,917 833,333 Gateway Casinos & Entertainment, First Lien Term $739,583 1,000,000 Gateway Casinos & Entertainment, Second Lien Term$850,000 250,000 Riviera Holdings Corp., Term Loan, 7.36%, 6/8/14 $231,250 Total Consumer Services $2,863,750 Media - 2.2% Broadcasting & Cable Television - 1.0% 2,000,000 Charter Communications Operating, LLC, Replacemen$1,850,770 Movies & Entertainment - 0.5% 995,000 Lodgenet Entertainment Corp., Closing Date Term L$922,862 Publishing - 0.7% 1,243,750 Canwest Mediaworks, L.P., Credit D Term Loan, 7.5$1,200,219 Total Media $3,973,851 Retailing - 0.8% Apparel, Accessories & Luxury Goods - 0.8% 1,505,978 Hanesbrands, Inc., Term Loan B, 6.533% - 7.11%, 9$1,456,327 Total Retailing $1,456,327 Health Care Equipment & Services - 4.8% Health Care Equipment & Services - 0.9% 1,741,206 Talecris Biotherapeutics Holdings Corp., First Lien Term Loan, 8.38% - 9.5%, 12/6/13 $1,730,323 Health Care Supplies - 0.6% 497,500 IM US Holdings, LLC, First Lien Term Loan, 7.198%$460,187 600,000 IM US Holdings, LLC, Second Lien Term Loan, 9.448$562,500 $1,022,687 Health Care Services - 0.6% 1,090,738 HealthSouth Corp., Term Loan, 5.78% - 6.92%, 3/11$1,022,567 Health Care Facilities - 2.7% 922,660 CHS/Community Health Systems, Inc., Term Loan, 7.$853,816 1,740,779 Hanger Orthopedic Group, Inc., Tranche B Term Loa$1,658,092 994,975 HCA, Inc., Tranche B Term Loan, 7.448%, 11/18/13 $921,828 498,042 Psychiatric Solutions, Inc., Term Loan, 6.568% - $480,611 104,307 Sun Healthcare Group, Inc., Delayed Draw Term Loa$98,049 162,256 Sun Healthcare Group, Inc., Synthetic LC Loan, 5.$152,521 706,608 Sun Healthcare Group, Inc., Term Loan, 6.78% - 7.$664,212 $4,829,129 Total Health Care Equipment & Services $8,604,706 Pharmaceuticals & Biotechnology & Life Sciences - 0.4% Pharmaceuticals - 0.4% 750,000 Mylan Inc., Tranche B Term Loam, 7.625%, 10/2/14 $735,000 Total Pharmaceuticals & Biotechnology & Life Scie$735,000 Diversified Financials - 3.2% Specialized Finance - 1.4% 875,721 Ace Cash Express, Inc., Term Loan, 7.86% - 8.7%, $757,499 439,482 Ceva Group Plc, Pre-Funded LC Loan, 7.86%, 11/4/1$428,495 1,334,229 Ceva Group 1 Plc, Term Loan, 8.086%, 11/4/13 $1,300,874 $2,486,868 Consumer Finance - 1.4% 992,481 Collect Acquisition Corp., Facility Term Loan B, $938,721 1,003,394 Dollar Financial Corp., Canadian Borrower Term Lo$968,275 737,790 Dollar Financial Corp., Delayed Draw Term Loan, 7$711,967 $2,618,963 Investment Banking & Brokerage - 0.4% 700,000 MSCI, Inc., Term Loan B, 7.74%, 11/20/14 $697,375 Total Diversified Financials $5,803,206 Insurance - 1.9% Insurance Brokers - 1.2% 70,992 HUB International, Ltd., Delay Draw Term Loan, 7.$63,893 406,454 HUB International, Ltd., Initial Term Loan, 7.33%$365,809 1,990,000 USI Holdings Corp., Tranche B Term Loan, 7.95%, 5$1,845,725 $2,275,427 Multi-Line Insurance - 0.7% 497,500 AmWins Group, Inc., Initial Term Loan, 7.82% - 8.$398,000 1,000,000 AmWins Group, Inc., Second Lien Initial Term Loan$825,000 $1,223,000 Total Insurance $3,498,427 Technology Hardware & Equipment - 3.1% Computer Storage & Peripherals - 1.8% 1,984,962 SunGard Data Systems Inc., New Term Loan, 6.898%,$1,844,568 1,488,750 Vangent, Inc., Term Loan, 7.62%, 2/14/13 $1,332,431 $3,176,999 Electronic Equipment Manufacturers - 1.4% 748,125 Aeroflex, Inc., Tranche B-2 Term Loan, 8.619%, 8/$705,108 1,980,000 H3C Holdings, Ltd., Tranche B Term Loan, 8.141%, $1,900,800 $2,605,908 Technology Distributors - 0.3% 513,713 Scitor Corp., Term Loan, 9.11%, 9/28/14 $506,649 Total Technology Hardware & Equipment $5,584,448 Semiconductors & Semiconductor Equipment - 0.5% Semiconductors - 0.5% 994,975 Freescale Semiconductor, Inc., Term Loan, 7.33%, $847,594 Total Semiconductors & Semiconductor Equipment $847,594 Telecommunication Services - 2.4% Alternative Carriers - 0.6% 1,243,725 PAETEC Holding Corp., Replacement Term Loan, 7.34$1,175,839 Wireless Telecommunication Services - 1.8% 994,950 Cricket Communications, Inc., Term Loan B, 7.448$960,281 1,741,184 MetroPCS Wireless, Inc., New Tranche B Term Loan,$1,630,183 625,000 Stratos Global Corp./Stratos Funding L.P., Facili$596,875 $3,187,339 Total Telecommunication Services $4,363,178 Utilities - 3.4% Multi-Utilities - 0.8% 1,496,250 Alliant Holdings I, Inc., Term Loan, 7.47%, 8/21/$1,413,956 Independent Power Producers & Energy Traders - 2.6% 1,985,000 Calpine Corp., First Priority Term Loan, 7.08%, 3$1,776,575 187,926 Mach Gen, LLC, First Lien Synthetic LC Loan, 7.35$169,885 1,798,450 Mach Gen, LLC, First Lien Term Loan B, 7.2%, 2/22$1,625,798 418,256 NRG Energy, Inc., Credit-Linked Deposit Loan, 7.1$385,266 905,913 NRG Energy, Inc., Term Loan, 6.948%, 2/1/13 $834,459 $4,791,983 Total Utilities $6,205,939 TOTAL FLOATING RATE LOAN INTERESTS (Cost $63,675,518) $58,742,291 FIXED RATE LOAN INTERESTS - 0.3% of Net Assets Energy - 0.3% Oil & Gas Exploration & Production - 0.3% 600,000 SandRidge Energy, Inc., Term Loan, 8.625%, 4/1/15$595,500 TOTAL FIXED RATE LOAN INTERESTS (Cost $602,931) $595,500 Shares WARRANTS - 0.0% of Net Assets (h) Real Estate - 0.0% Real Estate Management & Development - 0.0% 750,000 Neo-China Group Holdings, Ltd., Expires 7/22/12 $38,479 TOTAL WARRANTS (Cost $17,012) $38,479 TOTAL INVESTMENTS IN SECURITIES - 98.1% (Cost $190,534,453) (i) $177,452,305 OTHER ASSETS AND LIABILITIES - 1.9% $3,457,549 NET ASSETS APPLICABLE TO COMMON SHAREOWNERS - 100$180,909,854 (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 January 31, 2008, the value of these securities amounted to $89,108,829 or 49.3% of total net assets applicable to common shareowners. (a) Floating rate note. The rate shown is the rate at January 31, 2008. (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 January 31, 2008. (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 (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at January 31, 2008. (g) Indicates a security that has been deemed illiquid. The aggregate cost of illiquid securities is $996,458. The aggregate value $895,000 represents 0.5% of the net assets. (h) Non-income producing security. (i) At January 31, 2008, the net unrealized loss on investments based on cost for federal income tax purposes of $190,534,453 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $757,320 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value ($13,839,468) Net unrealized loss ($13,082,148) For financial reporting purposes net unrealized loss was $13,082,148 and cost of investments aggregated $190,534,453. Glossary of Terms: LC - Letter of Credit Note: Principal amounts are denominated in U.S. dollars unless otherwise denoted. EURO NOK 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 March 31, 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 (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date March 31, 2008 By (Signature and Title)* /s/ Vincent Nave Vincent Nave, Treasurer Date March 31, 2008 * Print the name and title of each signing officer under his or her signature.