[logo] PIONEER Investments(R)

November 21, 2012

VIA EDGAR

Securities and Exchange Commission
Division of Investment Management
100 F Street, NE
Washington, D.C.  20549

Re:     Pioneer Bond Fund
        (File Nos. 002-62436 and 811-02864)
        CIK No. 0000276776

Ladies and Gentlemen:

On behalf of Pioneer Bond Fund, a Delaware statutory trust (the "Fund"), and
pursuant to Rule 497 (c) under the Securities Act of 1933, as amended, we are
filing today via EDGAR exhibits containing interactive data format risk/return
summary information for the Fund. These exhibits contain the updated risk/return
summary information in the prospectus for the Fund, dated November 1, 2012, as
filed under Rule 497(c) on November 2, 2012 (SEC Accession Number 0000276776-12-
000035).

If you have any questions or comments relating to the filing, please contact me
at (617) 422-4695.

Very truly yours,


/s/ Thomas Reyes
    Thomas Reyes
    Assistant Secretary

cc:  Jeremy B. Kantrowitz, Esq.
     Toby R. Serkin, Esq.

Pioneer Investment Management, Inc.
60 State Street
Boston, MA  02109-1820

                "Member of the UniCredit S.p.A. banking group"

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                               PIONEER BOND FUND

                                 EXHIBIT INDEX

Index Number   Description of Index
------------   --------------------------------------------
EX-101.INS     XBRL Instance Document
EX-101.SCH     XBRL Taxonomy Extension Schema Document
EX-101.CAL     XBRL Taxonomy Extension Calculation Document
EX-101.DEF     XBRL Taxonomy Extension Definition Document
EX-101.LAB     XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE     XBRL Taxonomy Extension Presentation Linkbase

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