PAGE 1 000 A000000 09/30/2011 000 C000000 1166258 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 HIGH INCOME TRUST 001 B000000 811-21043 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 1 008 A000001 PIONEER INVESTMENT MANAGEMENT, INC. 008 B000001 A 008 C000001 801-8255 008 D010001 BOSTON 008 D020001 MA 008 D030001 02109 010 A000001 PIONEER INVESTMENT MANAGEMENT, INC. 010 B000001 801-8255 010 C010001 BOSTON 010 C020001 MA 010 C030001 02109 010 A000002 STATE STREET BANK & TRUST COMPANY, LLC 010 C010002 BOSTON 010 C020002 MA 010 C030002 02101 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 PAGE 2 011 C010003 MINNEAPOLIS 011 C020003 MN 011 C030003 55402 011 C040003 4422 011 A000004 ADVEST, INC. 011 B000004 8-21409 011 C010004 HARTFORD 011 C020004 CT 011 C030004 06103 011 A000005 JANNEY MONTGOMERY SCOTT, LLC 011 B000005 8-462 011 C010005 PHILADELPHIA 011 C020005 PA 011 C030005 19103 011 C040005 1675 011 A000006 MCDONALD INVESTMENTS, INC. 011 B000006 8-30177 011 C010006 CLEVELAND 011 C020006 OH 011 C030006 44114 011 C040006 2603 011 A000007 STIFEL, NICOLAUS & CO., INC. 011 B000007 8-001447 011 C010007 ST. LOUIS 011 C020007 MO 011 C030007 63102 012 A000001 PIONEER INVEST. MGMT. SHAREHOLDER SVCS., INC. 012 B000001 85-1359 012 C010001 BOSTON 012 C020001 MA 012 C030001 02109 012 A000002 AMERICAN STOCK TRANSFER & TRUST CO. (COMMON) 012 B000002 85-00000 012 C010002 BROOKLYN 012 C020002 NY 012 C030002 11219 012 A000003 DEUTSCHE BANK TRUST COMPANY AMERICAS (PREF.) 012 B000003 85-05212 012 C010003 NEW YORK 012 C020003 NY 012 C030003 10005 013 A000001 ERNST & YOUNG, LLP 013 B010001 BOSTON 013 B020001 MA 013 B030001 02116 013 B040001 5072 015 A000001 BROWN BROTHERS HARRIMAN & CO. 015 B000001 C 015 C010001 BOSTON 015 C020001 MA 015 C030001 02109 PAGE 3 015 E010001 X 015 A000002 BANK AUSTRIA 015 B000002 S 015 C010002 VIENNA 015 D010002 AUSTRIA 015 E040002 X 015 A000003 BANQUE BRUXELLES LAMBERT 015 B000003 S 015 C010003 BRUSSELS 015 D010003 BELGIUM 015 E040003 X 015 A000004 BANK OF BOSTON 015 B000004 S 015 C010004 SAO PAULO 015 D010004 BRAZIL 015 E040004 X 015 A000005 NATIONAL AUSTRALIA BANK 015 B000005 S 015 C010005 MELBOURNE 015 D010005 AUSTRALIA 015 E040005 X 015 A000006 ROYAL BANK OF CANADA 015 B000006 S 015 C010006 TORONTO 015 D010006 CANADA 015 E040006 X 015 A000007 DEN DANSKE BANK 015 B000007 S 015 C010007 COPENHAGEN 015 D010007 DENMARK 015 E040007 X 015 A000008 MERITA BANK 015 B000008 S 015 C010008 HELSINKI 015 D010008 FINLAND 015 E040008 X 015 A000009 BANQUE PARIBAS 015 B000009 S 015 C010009 PARIS 015 D010009 FRANCE 015 E040009 X 015 A000010 DRESDNER BANK 015 B000010 S 015 C010010 FRANKFURT 015 D010010 GERMANY 015 E040010 X 015 A000011 CITIBANK, N.A. 015 B000011 S 015 C010011 ATHENS 015 D010011 GREECE 015 E040011 X PAGE 4 015 A000012 STANDARD CHARTERED BANK 015 B000012 S 015 C010012 HONG KONG 015 D010012 HONG KONG 015 E040012 X 015 A000013 CITIBANK, N.A. 015 B000013 S 015 C010013 MUMBAI 015 D010013 INDIA 015 E040013 X 015 A000014 BANCA COMMERCIALE ITALIANA 015 B000014 S 015 C010014 MILAN 015 D010014 ITALY 015 E040014 X 015 A000015 THE SUMITOMO BANK, LIMITED 015 B000015 S 015 C010015 TOKYO 015 D010015 JAPAN 015 E040015 X 015 A000016 CITIBANK, N.A. 015 B000016 S 015 C010016 SEOUL 015 D010016 SOUTH KOREA 015 E040016 X 015 A000017 HONG KONG BANK MALAYSIA 015 B000017 S 015 C010017 KUALA LUMPUR 015 D010017 MALAYSIA 015 E040017 X 015 A000018 CITIBANK, N.A. 015 B000018 S 015 C010018 MEXICO CITY 015 D010018 MEXICO 015 E040018 X 015 A000019 MEESPIERSON 015 B000019 S 015 C010019 AMSTERDAM 015 D010019 NETHERLANDS 015 E040019 X 015 A000020 NATIONAL NOMINEES LIMITED 015 B000020 S 015 C010020 AUCKLAND 015 D010020 NEW ZEALAND 015 E040020 X 015 A000021 DEN NORSE BANK 015 B000021 S 015 C010021 OSLO 015 D010021 NORWAY 015 E040021 X 015 A000022 CITIBANK, N.A. PAGE 5 015 B000022 S 015 C010022 WARSAW 015 D010022 POLAND 015 E040022 X 015 A000023 BANCO COMMERCIAL PORTUGUESE SA 015 B000023 S 015 C010023 LISBON 015 D010023 PORTUGAL 015 E040023 X 015 A000024 STANDARD CHARTERED BANK 015 B000024 S 015 C010024 SINGAPORE 015 D010024 SINGAPORE 015 E040024 X 015 A000025 BANCO DE SANTANDER 015 B000025 S 015 C010025 MADRID 015 D010025 SPAIN 015 E040025 X 015 A000026 SKANDINAVISKA ENSKILDA BANKEN 015 B000026 S 015 C010026 STOCKHOLM 015 D010026 SWEDEN 015 E040026 X 015 A000027 UNION BANK OF SWITZERLAND AG 015 B000027 S 015 C010027 ZURICH 015 D010027 SWITZERLAND 015 E040027 X 015 A000028 CENTRAL TRUST OF CHINA 015 B000028 S 015 C010028 TAIPEI 015 D010028 TAIWAN 015 E040028 X 015 A000029 HONG KONG AND SHANGHAI BANKING CORPORATION 015 B000029 S 015 C010029 BANGKOK 015 D010029 THAILAND 015 E040029 X 015 A000030 MIDLAND BANK 015 B000030 S 015 C010030 LONDON 015 D010030 UNITED KINGDOM 015 E040030 X 015 A000031 FIRST NATIONAL BANK OF SOUTH AFRICA 015 B000031 S 015 C010031 JOHANNESBURG 015 D010031 SOUTH AFRICA 015 E040031 X 018 000000 Y 019 A000000 Y PAGE 6 019 B000000 55 019 C000000 PIONEERFDS 020 A000001 SUSQUEHANNA FINANCIAL GROUP, LLLP 020 C000001 0 020 A000002 BB&T INVESTMENT SERVICES, INC. 020 C000002 0 020 A000003 ITG INC. 020 B000003 95-4339369 020 C000003 0 020 A000004 CREDIT SUISSE SECURITIES (USA) L.L.C. 020 B000004 13-5659485 020 C000004 0 020 A000005 UBS SECURITIES LLC 020 B000005 13-3873456 020 C000005 0 020 A000006 BARCLAYS CAPITAL INC. 020 C000006 0 020 A000007 CITIGROUP, INC. 020 B000007 13-3039426 020 C000007 0 020 A000008 JP MORGAN SECURITIES, INC. 020 B000008 13-3379014 020 C000008 0 020 A000009 GOLDMAN SACHS & CO. 020 B000009 13-5108880 020 C000009 0 020 A000010 CANTOR FITZGERALD 020 B000010 13-3680187 020 C000010 0 021 000000 0 022 A000001 BNP PARIBAS SECURITIES CORP. 022 B000001 13-3235334 022 C000001 241325 022 D000001 0 022 A000002 DEUTSCHE BANK SECURITIES INC. 022 B000002 13-2730828 022 C000002 222303 022 D000002 505 022 A000003 SOCIETE GENERALE 022 C000003 218335 022 D000003 0 022 A000004 BARCLAYS CAPITAL INC. 022 C000004 63575 022 D000004 0 022 A000005 UBS AG 022 B000005 13-3340045 022 C000005 15400 022 D000005 0 022 A000006 J.P. MORGAN SECURITIES INC. 022 B000006 13-3299429 022 C000006 12427 PAGE 7 022 D000006 0 022 A000007 CITIGROUP GLOBAL MARKETS, INC. 022 B000007 11-2418191 022 C000007 7980 022 D000007 0 022 A000008 GOLDMAN, SACHS & CO. 022 B000008 13-5108880 022 C000008 6615 022 D000008 0 022 A000009 MORGAN STANLEY & CO., INC. 022 B000009 13-2655998 022 C000009 4809 022 D000009 799 022 A000010 CREDIT SUISSE SECURITIES (USA) LLC 022 B000010 13-5659485 022 C000010 340 022 D000010 1705 023 C000000 797067 023 D000000 5168 024 000000 Y 025 A000001 GOLDMAN SACHS CAPITAL II 025 C000001 D 025 D000001 1442 025 A000002 BANK OF AMERICA CORP. 025 C000002 E 025 D000002 1441 025 A000003 JANUS CAPITAL GROUP, INC. 025 C000003 D 025 D000003 1010 026 A000000 N 026 B000000 Y 026 C000000 N 026 D000000 Y 026 E000000 N 026 F000000 N 026 G010000 N 026 G020000 N 026 H000000 N 027 000000 N 028 A010000 0 028 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 PAGE 8 028 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 048 000000 0.600 048 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 PAGE 9 048 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 N 056 000000 Y 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 Y 060 B000000 Y 061 000000 0 062 A000000 Y 062 B000000 0.0 062 C000000 0.0 062 D000000 1.9 062 E000000 0.0 062 F000000 0.0 062 G000000 0.0 062 H000000 0.0 062 I000000 0.0 062 J000000 0.0 PAGE 10 062 K000000 0.0 062 L000000 10.5 062 M000000 0.0 062 N000000 0.0 062 O000000 6.7 062 P000000 131.5 062 Q000000 0.0 062 R000000 3.2 063 A000000 0 063 B000000 5.7 064 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 070 L010000 Y 070 L020000 Y 070 M010000 Y 070 M020000 Y 070 N010000 Y 070 N020000 Y 070 O010000 Y 070 O020000 N 070 P010000 N 070 P020000 N 070 Q010000 N PAGE 11 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 95133 071 B000000 79411 071 C000000 523922 071 D000000 15 072 A000000 6 072 B000000 25810 072 C000000 110 072 D000000 0 072 E000000 67 072 F000000 1449 072 G000000 172 072 H000000 0 072 I000000 4 072 J000000 78 072 K000000 0 072 L000000 23 072 M000000 8 072 N000000 12 072 O000000 0 072 P000000 0 072 Q000000 0 072 R000000 30 072 S000000 9 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 259 072 X000000 2044 072 Y000000 0 072 Z000000 23943 072AA000000 9072 072BB000000 0 072CC010000 0 072CC020000 65316 072DD010000 23145 072DD020000 0 072EE000000 0 073 A010000 0.8300 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 1311 074 B000000 0 074 C000000 43078 074 D000000 480543 074 E000000 3776 074 F000000 7447 074 G000000 0 PAGE 12 074 H000000 0 074 I000000 0 074 J000000 96 074 K000000 0 074 L000000 13762 074 M000000 386 074 N000000 550399 074 O000000 1229 074 P000000 301 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 50038 074 S000000 151001 074 T000000 347830 074 U010000 28129 074 U020000 0 074 V010000 12.37 074 V020000 0.00 074 W000000 0.0000 074 X000000 20275 074 Y000000 0 075 A000000 0 075 B000000 416267 076 000000 16.35 077 A000000 N 078 000000 N 080 C000000 0 081 B000000 0 082 B000000 0 083 B000000 0 084 B000000 0 086 A010000 129 086 A020000 2036 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 72369H106 087 A030000 PHT 087 B010000 PREFERRED STOCK-SERIES M7 087 B020000 72369H205 087 C010000 PREFERRED STOCK-SERIES W28 PAGE 13 087 C020000 72369H304 088 A000000 N 088 B000000 N 088 C000000 N 088 D000000 Y SIGNATURE MARK E. BRADLEY TITLE TREASURER