UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-PX
                ANNUAL REPORT OF PROXY VOTING RECORD OF REGISTERED
                         MANAGEMENT INVESTMENT COMPANIES

                    Investment Company Act file number 811-21558
                                                           -----

Pioneer Short Term Income Fund
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(Exact name of registrant as specified in charter)

60 State Street Boston, MA  02109
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(Address of principal executive offices)

Dorothy Bourassa
60 State Street
Boston, MA  02109
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(Name and address of agent for service)

Registrant's telephone number, including area code:  (617) 742-7825

Date of fiscal year end:  August 31

Date of reporting period:  July 1, 2006 to June 30, 2007

SIGNATURES

Pursuant to the requirements of 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 Short Term Income Fund

By (Signature and Title)  /s/ John F. Cogan, Jr.
                         -------------------------
                         John F. Cogan, Jr., Chairman and President

Date  August 17, 2007
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========================= PIONEER SHORT TERM INCOME FUND =======================


SEVAN MARINE AS

Ticker:                      Security ID:  R776D4AA1
Meeting Date: MAY 3, 2007    Meeting Type: Bondholder
Record Date:

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Approve Notice of Meeting                 For       For        Management
2     Approve Agenda                            For       For        Management
3     Designate Inspector or Bondholder         For       For        Management
      Representative(s) of Minutes of Meeting
4     Approve Revised Final Maturity Dates of   For       For        Management
      Bond (May 14, 2007 Through May 16, 2007)
      Approve Maturity Price of Bond of 103.20
      Percent
========== END NPX REPORT