PAGE 1 000 B000000 04/30/2014 000 C000000 0001388126 000 D000000 N 000 E000000 NF 000 F000000 Y 000 G000000 N 000 H000000 N 000 I000000 6.1 000 J000000 A 001 A000000 PIONEER DIVERSIFIED HIGH INCOME TRUST 001 B000000 811-22014 001 C000000 6177427825 002 A000000 60 STATE STREET 002 B000000 BOSTON 002 C000000 MA 002 D010000 02109 003 000000 N 004 000000 N 005 000000 N 006 000000 N 007 A000000 N 007 B000000 0 007 C010100 1 007 C010200 2 007 C010300 3 007 C010400 4 007 C010500 5 007 C010600 6 007 C010700 7 007 C010800 8 007 C010900 9 007 C011000 10 008 A000001 PIONEER INVESTMENT MANAGEMENT, INC. 008 B000001 A 008 C000001 801-8255 008 D010001 BOSTON 008 D020001 MA 008 D030001 02109 008 A000002 MONTPELIER CAPITAL ADVISORS, LTD. 008 B000002 S 008 C000002 801-00000 008 D010002 HAMILTON 008 D050002 BERMUDA 010 A000001 PIONEER INVESTMENT MANAGEMENT, INC. 010 B000001 801-8255 010 C010001 BOSTON 010 C020001 MA 010 C030001 02109 010 A000002 BROWN BROTHERS HARRIMAN & CO. 010 C010002 BOSTON 010 C020002 MA PAGE 2 010 C030002 02110 011 A000001 MERRILL LYNCH & CO. 011 B000001 8-7221 011 C010001 NEW YORK 011 C020001 NY 011 C030001 10281 011 C040001 1201 011 A000002 UBS INVESTMENT BANK 011 B000002 8-022651 011 C010002 STAMFORD 011 C020002 CT 011 C030002 06901 011 A000003 RBC CAPITAL MARKETS CORP. 011 B000003 8-045411 011 C010003 MINNEAPOLIS 011 C020003 MN 011 C030003 55402 011 C040003 4422 011 A000004 ROBERT W. BAIRD & CO. 011 B000004 8-00497 011 C010004 MILWAUKEE 011 C020004 WI 011 C030004 53201 011 C040004 0672 011 A000005 JANNEY MONTGOMERY SCOTT, LLC 011 B000005 8-462 011 C010005 PHILADELPHIA 011 C020005 PA 011 C030005 19103 011 C040005 1675 011 A000006 FERRIS, BAKER WATTS, INC. 011 B000006 8-00000 011 C010006 WASHINGTON 011 C020006 DC 011 C030006 20006 011 A000007 MORGAN KEEGAN & CO., INC. 011 B000007 8-15001 011 C010007 MEMPHIS 011 C020007 TN 011 C030007 38103 012 A000001 PIONEER INVEST. MGT. SHAREHOLDER SVCS., INC. 012 B000001 85-1359 012 C010001 BOSTON 012 C020001 MA 012 C030001 02109 012 A000002 AMERICAN STOCK TRANSFER & TRUST CO. 012 B000002 85-00000 012 C010002 BROOKLYN 012 C020002 NY 012 C030002 11219 013 A000001 ERNST & YOUNG, LLP PAGE 3 013 B010001 BOSTON 013 B020001 MA 013 B030001 02116 013 B040001 5072 015 A000001 BROWN BROTHER HARRIMAN & CO. 015 B000001 C 015 C010001 BOSTON 015 C020001 MA 015 C030001 02110 015 E010001 X 015 A000002 CITIBANK, N.A., BUENOS AIRES BRANCH 015 B000002 S 015 C010002 BUENOS AIRES 015 D010002 ARGENTINA 015 E040002 X 015 A000003 HSBC BANK AUSTRALIA LIMITED 015 B000003 S 015 C010003 SYDNEY 015 D010003 AUSTRALIA 015 E040003 X 015 A000004 UNICREDIT BANK AUSTRIA AG 015 B000004 S 015 C010004 VIENNA 015 D010004 AUSTRIA 015 E040004 X 015 A000005 BNP PARIBAS SECURITIES SERVICES 015 B000005 S 015 C010005 PARIS 015 D010005 BELGIUM 015 E040005 X 015 A000006 EUROCLEAR BANK SA NV 015 B000006 S 015 C010006 BRUSSELS 015 D010006 BELGIUM 015 E040006 X 015 A000007 STANDARD CHARTERED BANK,BANGLADESH BRANCH 015 B000007 S 015 C010007 DHAKA 015 D010007 BANGLADESH 015 E040007 X 015 A000008 CITIBANK, N.A., SAO PAULO BRANCH 015 B000008 S 015 C010008 SAO PAULO 015 D010008 BRAZIL 015 E040008 X 015 A000009 ING BANK, N.V., SOFIA BRANCH 015 B000009 S 015 C010009 SOFIA 015 D010009 BULGARIA 015 E040009 X 015 A000010 RBC INVESTOR SERVICES TRUST PAGE 4 015 B000010 S 015 C010010 TORONTO 015 D010010 CANADA 015 E040010 X 015 A000011 BANCO DE CHILE 015 B000011 S 015 C010011 SANTIAGO 015 D010011 CHILE 015 E040011 X 015 A000012 STANDARD CHARTERED BANK (CHINA) LIMITED 015 B000012 S 015 C010012 SHANGHAI 015 D010012 CHINA 015 E040012 X 015 A000013 CITITRUST COLOMBIA S.A., SOCIEDAD FIDUCIARA 015 B000013 S 015 C010013 BOGOTA 015 D010013 COLOMBIA 015 E040013 X 015 A000014 UNICREDIT BANK AUSTRIA AG 015 B000014 S 015 C010014 VIENNA 015 D010014 CROATIA 015 E040014 X 015 A000015 CITIBANK EUROPE PLC, ORGANIZACNI SLOZKA 015 B000015 S 015 C010015 PRAGUE 015 D010015 CZECH REPUBLIC 015 E040015 X 015 A000017 SKANDINAVISKA ENSKILDA BANKEN AB (PUBL) DAN 015 B000017 S 015 C010017 COPENHAGEN 015 D010017 DENMARK 015 E040017 X 015 A000018 CITIBANK N.A., CAIRO BRANCH 015 B000018 S 015 C010018 CAIRO 015 D010018 EGYPT 015 E040018 X 015 A000019 NORDEA BANK FINLAND PLC 015 B000019 S 015 C010019 HELSINKI 015 D010019 FINLAND 015 E040019 X 015 A000020 BNP PARIBAS SECURITIES SERVICES 015 B000020 S 015 C010020 PARIS 015 D010020 FRANCE 015 E040020 X 015 A000021 BNP PARIBAS SECURITIES SERVICES, FRANKFURT BR 015 B000021 S PAGE 5 015 C010021 FRANKFURT 015 D010021 GERMANY 015 E040021 X 015 A000022 HSBC BANK PLC, ATHENS BRANCH 015 B000022 S 015 C010022 ATHENS 015 D010022 GREECE 015 E040022 X 015 A000023 STANDARD CHARTERED BANK GHANA LTD. 015 B000023 S 015 C010023 ACCRA 015 D010023 GHANA 015 E040023 X 015 A000024 STANDARD CHARTERED BANK (HONG KONG) LIMITED 015 B000024 S 015 C010024 KWUN TONG 015 D010024 HONG KONG 015 E040024 X 015 A000025 CITIBANK EUROPE PLC, HUNGARIAN BRANCH 015 B000025 S 015 C010025 BUDAPEST 015 D010025 HUNGARY 015 E040025 X 015 A000026 CITIBANK, N.A.-MUMBAI BRANCH 015 B000026 S 015 C010026 MUMBAI 015 D010026 INDIA 015 E040026 X 015 A000027 CITIBANK, N.A., JAKARTA BRANCH 015 B000027 S 015 C010027 JAKARTA 015 D010027 INDONESIA 015 E040027 X 015 A000028 CITIBANK, N.A., LONDON BRANCH 015 B000028 S 015 C010028 LONDON 015 D010028 IRELAND 015 E040028 X 015 A000029 BANK HAPOALIM BM 015 B000029 S 015 C010029 TEL AVIV 015 D010029 ISRAEL 015 E040029 X 015 A000030 BNP PARIBAS SECURITIES SERVICES, MILAN BRANCH 015 B000030 S 015 C010030 MILAN 015 D010030 ITALY 015 E040030 X 015 A000031 SUMITOMO MITSU BANKING CORPORATION 015 B000031 S 015 C010031 TOKYO PAGE 6 015 D010031 JAPAN 015 E040031 X 015 A000032 HSBC BANK MIDDLE EAST LIMITED, JORDAN BRANCH 015 B000032 S 015 C010032 AMMAN 015 D010032 JORDAN 015 E040032 X 015 A000033 CFC STANBIC BANK LIMITED 015 B000033 S 015 C010033 NAIROBI 015 D010033 KENYA 015 E040033 X 015 A000034 HSBC BANK MIDDLE EAST LIMITED, KUWAIT BRANCH 015 B000034 S 015 C010034 SAFAT 015 D010034 KUWAIT 015 E040034 X 015 A000035 KBL EUROPEAN PRIVATE BANKERS SA 015 B000035 S 015 C010035 LUXEMBOURG 015 D010035 LUXEMBOURG 015 E040035 X 015 A000036 HSBC BANK MALAYSIA BERHAD 015 B000036 S 015 C010036 KUALA LUMPUR 015 D010036 MALAYSIA 015 E040036 X 015 A000037 BANCO NACIONAL DE MEXICO, S.A. (BANAMEX) 015 B000037 S 015 C010037 MEXICO CITY 015 D010037 MEXICO 015 E040037 X 015 A000038 CITIBANK MAGHREB 015 B000038 S 015 C010038 CASABLANCA 015 D010038 MOROCCO 015 E040038 X 015 A000039 BNP PARIBAS SECURITIES SERVICES 015 B000039 S 015 C010039 PARIS 015 D010039 NETHERLANDS 015 E040039 X 015 A000040 HSBC LIMITED, NEW ZEALAND BRANCH 015 B000040 S 015 C010040 AUCKLAND 015 D010040 NEW ZEALAND 015 E040040 X 015 A000041 STANBIC IBTC BANK PLC 015 B000041 S 015 C010041 LAGOS 015 D010041 NIGERIA PAGE 7 015 E040041 X 015 A000042 NORDEA BANK NORGE ASA 015 B000042 S 015 C010042 OSLO 015 D010042 NORWAY 015 E040042 X 015 A000043 CITIBANK DEL PERU S.A. 015 B000043 S 015 C010043 LIMA 015 D010043 PERU 015 E040043 X 015 A000044 HSBC LIMITED, PHILIPPINE BRANCH 015 B000044 S 015 C010044 TAGUIG CITY 015 D010044 PHILIPPINES 015 E040044 X 015 A000045 BANK HANDLOWY W WARSZAWIE SA 015 B000045 S 015 C010045 WARSAW 015 D010045 POLAND 015 E040045 X 015 A000046 BNP PARIBAS SECURITIES SERVICES 015 B000046 S 015 C010046 PANTIN 015 D010046 PORTUGAL 015 E040046 X 015 A000047 ING BANK N.V., BUCHAREST BRANCH 015 B000047 S 015 C010047 BUCHAREST 015 D010047 ROMANIA 015 E040047 X 015 A000048 ZAO CITIBANK 015 B000048 S 015 C010048 MOSCOW 015 D010048 RUSSIA 015 E040048 X 015 A000049 HSBC BANK MIDDLE EAST LIMITED, QATAR BRANCH 015 B000049 S 015 C010049 JERSEY 015 D010049 QATAR 015 E040049 X 015 A000050 HSBC SAUDI ARABIA LIMITED 015 B000050 S 015 C010050 RIYADH 015 D010050 SAUDI ARABIA 015 E040050 X 015 A000051 STANDARD CHARTERED BANK SINGAPORE BRANCH 015 B000051 S 015 C010051 SINGAPORE 015 D010051 SINGAPORE 015 E040051 X PAGE 8 015 A000052 ING BANK NV, BRATISLAVA BRANCH 015 B000052 S 015 C010052 BRATISLAVA 015 D010052 SLOVAKIA 015 E040052 X 015 A000053 STANDARD BANK OF SOUTH AFRICA LIMITED 015 B000053 S 015 C010053 JOHANNESBURG 015 D010053 SOUTH AFRICA 015 E040053 X 015 A000054 CITIBANK KOREA INC 015 B000054 S 015 C010054 SEOUL 015 D010054 SOUTH KOREA 015 E040054 X 015 A000055 BANCO BILBAO VIZCAYA ARGENTARIA SA 015 B000055 S 015 C010055 MADRID 015 D010055 SPAIN 015 E040055 X 015 A000056 HSBC,SRI LANKA BRANCH 015 B000056 S 015 C010056 COLOMBO 015 D010056 SRI LANKA 015 E040056 X 015 A000057 SKANDINAVISKA ENSKILDA BANKEN AB (PUBL) 015 B000057 S 015 C010057 STOCKHOLM 015 D010057 SWEDEN 015 E040057 X 015 A000058 CREDIT SUISSE AG 015 B000058 S 015 C010058 ZURICH 015 D010058 SWITZERLAND 015 E040058 X 015 A000059 BANK OF TAIWAN 015 B000059 S 015 C010059 TAIPEI 015 D010059 TAIWAN 015 E040059 X 015 A000060 HSBC LIMITED, THAILAND BRANCH 015 B000060 S 015 C010060 BANGKOK 015 D010060 THAILAND 015 E040060 X 015 A000061 CITIBANK ANONIM SIRKETI 015 B000061 S 015 C010061 ISTANBUL 015 D010061 TURKEY 015 E040061 X 015 A000062 HSBC BANK MIDDLE EAST LIMITED PAGE 9 015 B000062 S 015 C010062 DUBAI 015 D010062 UNITED ARAB EMIRATES 015 E040062 X 015 A000063 HSBC BANK PLC 015 B000063 S 015 C010063 LONDON 015 D010063 UNITED KINGDOM 015 E040063 X 015 A000064 CITIBANK, N.A., CARACAS BRANCH 015 B000064 S 015 C010064 CARACAS 015 D010064 VENEZUELA 015 E040064 X 015 A000065 HSBC BANK (VIETNAM) LTD 015 B000065 S 015 C010065 HO CHI MINH CITY 015 D010065 VIETNAM 015 E040065 X 018 000000 Y 019 A000000 Y 019 B000000 55 019 C000000 PIONEERFDS 020 A000001 J.P. MORGAN SECURITIES, LLC 020 B000001 13-3224016 020 C000001 1 020 C000002 0 020 C000003 0 020 C000004 0 020 C000005 0 020 C000006 0 020 C000007 0 020 C000008 0 020 C000009 0 020 C000010 0 021 000000 1 022 A000001 SCOTIA CAPITAL (USA) INC. 022 B000001 13-5239583 022 C000001 244770 022 D000001 0 022 A000002 BROWN BROTHERS HARRIMAN & CO. 022 B000002 13-4973745 022 C000002 17684 022 D000002 24828 022 A000003 DEUTSCHE BANK SECURITIES, INC. 022 B000003 13-2730828 022 C000003 34886 022 D000003 527 022 A000004 BNY MELLON CAPITAL MARKETS, LLC 022 B000004 23-2384977 022 C000004 13398 PAGE 10 022 D000004 4722 022 A000005 J.P. MORGAN SECURITIES INC. 022 B000005 13-3379014 022 C000005 11500 022 D000005 771 022 A000006 GOLDMAN SACHS & CO. 022 B000006 13-5108880 022 C000006 10088 022 D000006 350 022 A000007 CITIGROUP GLOBAL MARKETS INC. 022 B000007 11-2418191 022 C000007 5432 022 D000007 1164 022 A000008 CREDIT SUISSE SECURITIES (USA) LLC. 022 B000008 13-5659485 022 C000008 5854 022 D000008 255 022 A000009 BARCLAYS CAPITAL, INC. 022 B000009 61-0316560 022 C000009 4586 022 D000009 587 022 A000010 ROYAL BANK OF CANADA 022 B000010 00-0000000 022 C000010 1718 022 D000010 2698 023 C000000 366516 023 D000000 40169 024 000000 Y 025 A000001 GOLDMAN SACHS CAPITAL II 025 B000001 20-6109939 025 C000001 D 025 D000001 347 025 A000002 DELETE 025 D000002 0 025 D000003 0 025 D000004 0 025 D000005 0 025 D000006 0 025 D000007 0 025 D000008 0 026 A000000 Y 026 B000000 Y 026 C000000 N 026 D000000 Y 026 E000000 N 026 F000000 N 026 G010000 N 026 G020000 Y 026 H000000 N 027 000000 N 028 A010000 0 PAGE 11 028 A020000 0 028 A030000 0 028 A040000 0 028 B010000 0 028 B020000 0 028 B030000 0 028 B040000 0 028 C010000 0 028 C020000 0 028 C030000 0 028 C040000 0 028 D010000 0 028 D020000 0 028 D030000 0 028 D040000 0 028 E010000 0 028 E020000 0 028 E030000 0 028 E040000 0 028 F010000 0 028 F020000 0 028 F030000 0 028 F040000 0 028 G010000 0 028 G020000 0 028 G030000 0 028 G040000 0 028 H000000 0 030 A000000 0 030 B000000 0.00 030 C000000 0.00 031 A000000 0 031 B000000 0 032 000000 0 033 000000 0 035 000000 0 036 B000000 0 038 000000 0 042 A000000 0 042 B000000 0 042 C000000 0 042 D000000 0 042 E000000 0 042 F000000 0 042 G000000 0 042 H000000 0 043 000000 0 044 000000 0 045 000000 Y 046 000000 N 047 000000 Y PAGE 12 048 000000 0.850 048 A010000 0 048 A020000 0.000 048 B010000 0 048 B020000 0.000 048 C010000 0 048 C020000 0.000 048 D010000 0 048 D020000 0.000 048 E010000 0 048 E020000 0.000 048 F010000 0 048 F020000 0.000 048 G010000 0 048 G020000 0.000 048 H010000 0 048 H020000 0.000 048 I010000 0 048 I020000 0.000 048 J010000 0 048 J020000 0.000 048 K010000 0 048 K020000 0.000 049 000000 N 050 000000 N 051 000000 N 052 000000 N 053 A000000 N 054 A000000 Y 054 B000000 Y 054 C000000 Y 054 D000000 N 054 E000000 N 054 F000000 N 054 G000000 N 054 H000000 Y 054 I000000 N 054 J000000 Y 054 K000000 N 054 L000000 N 054 M000000 Y 054 N000000 N 054 O000000 N 055 A000000 N 055 B000000 Y 056 000000 N 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 Y 060 B000000 Y PAGE 13 061 000000 0 062 A000000 Y 062 B000000 0.0 062 C000000 0.0 062 D000000 0.0 062 E000000 0.0 062 F000000 0.0 062 G000000 0.0 062 H000000 0.0 062 I000000 0.0 062 J000000 0.0 062 K000000 0.0 062 L000000 0.0 062 M000000 0.0 062 N000000 0.0 062 O000000 0.0 062 P000000 101.1 062 Q000000 31.1 062 R000000 6.4 063 A000000 0 063 B000000 5.2 064 A000000 N 064 B000000 Y 065 000000 N 066 A000000 N 067 000000 N 068 A000000 N 068 B000000 N 069 000000 N 070 A010000 Y 070 A020000 Y 070 B010000 Y 070 B020000 N 070 C010000 Y 070 C020000 N 070 D010000 Y 070 D020000 N 070 E010000 Y 070 E020000 N 070 F010000 Y 070 F020000 N 070 G010000 Y 070 G020000 N 070 H010000 Y 070 H020000 N 070 I010000 N 070 I020000 N 070 J010000 Y 070 J020000 Y 070 K010000 Y 070 K020000 Y PAGE 14 070 L010000 Y 070 L020000 Y 070 M010000 Y 070 M020000 Y 070 N010000 Y 070 N020000 N 070 O010000 Y 070 O020000 Y 070 P010000 N 070 P020000 N 070 Q010000 N 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 88337 071 B000000 91178 071 C000000 229752 071 D000000 38 072 A000000 12 072 B000000 19027 072 C000000 164 072 D000000 0 072 E000000 366 072 F000000 1998 072 G000000 123 072 H000000 0 072 I000000 9 072 J000000 43 072 K000000 0 072 L000000 14 072 M000000 6 072 N000000 0 072 O000000 0 072 P000000 744 072 Q000000 0 072 R000000 44 072 S000000 21 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 91 072 X000000 3093 072 Y000000 0 072 Z000000 16464 072AA000000 0 072BB000000 4012 072CC010000 958 072CC020000 0 072DD010000 19032 072DD020000 0 072EE000000 0 PAGE 15 073 A010000 2.2900 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 0 074 B000000 0 074 C000000 0 074 D000000 220188 074 E000000 9294 074 F000000 1373 074 G000000 0 074 H000000 0 074 I000000 26 074 J000000 3316 074 K000000 0 074 L000000 3544 074 M000000 62 074 N000000 237803 074 O000000 301 074 P000000 163 074 Q000000 67000 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 3728 074 S000000 0 074 T000000 166611 074 U010000 8320 074 U020000 0 074 V010000 20.03 074 V020000 0.00 074 W000000 0.0000 074 X000000 3194 074 Y000000 0 075 A000000 0 075 B000000 166706 076 000000 20.85 077 A000000 Y 077 B000000 Y 077 C000000 N 077 D000000 N 077 E000000 N 077 F000000 N 077 G000000 N 077 H000000 N 077 I000000 N 077 J000000 N 077 K000000 Y 077 L000000 N 077 M000000 N 077 N000000 N PAGE 16 077 O000000 N 077 P000000 N 077 Q010000 N 077 Q020000 N 077 Q030000 N 078 000000 N 080 A000000 ICI MUTUAL INSURANCE COMPANY 080 C000000 45000 081 A000000 Y 081 B000000 55 082 A000000 Y 082 B000000 0 083 A000000 N 083 B000000 0 084 A000000 N 084 B000000 0 085 A000000 N 085 B000000 N 086 A010000 29 086 A020000 587 086 B010000 0 086 B020000 0 086 C010000 0 086 C020000 0 086 D010000 0 086 D020000 0 086 E010000 0 086 E020000 0 086 F010000 0 086 F020000 0 087 A010000 COMMON STOCK 087 A020000 723653101 087 A030000 HNW 088 A000000 Y 088 B000000 N 088 C000000 N 088 D000000 N SIGNATURE MARK BRADLEY TITLE TREASURER