MORGAN, LEWIS & BOCKIUS LLP
                               ONE FEDERAL STREET
                          BOSTON, MASSACHUSETTS 02110

                                                              December 22, 2015

VIA EDGAR

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

     Re:   Pioneer Series Trust V (File Nos. 333-129005; 811-21823)
           Registration Statement on Form N-1A

Ladies and Gentlemen:

     This letter is to respond to comments we received from Mr. Jay
Williamson of the Staff of the Division of Investment Management of the
Securities and Exchange Commission (the "Commission") regarding Post-Effective
Amendment No. 25 to the Registration Statement on Form N-1A of Pioneer Series
Trust V (the "Registrant"), with respect to its series Pioneer Long/Short Bond
Fund (the "Fund"). Following are the Staff's comments and the Registrant's
responses thereto:

1.   COMMENT:   The Staff asked that the Registrant provide a letter to the
                Commission responding to the Staff's comments and that includes
                certain "Tandy" acknowledgments.

     RESPONSE:  A Tandy representation letter executed in connection with the
                filing of this response is attached hereto as Exhibit A.

2.   COMMENT:   The Staff requested that the Registrant confirm in its response
                that Pioneer has no ability to recoup any amounts waived or
                expenses reimbursed under the contractual fee waiver discussed
                in Footnote 2 to the Fee Table.

     RESPONSE:  The Registrant confirms that Pioneer has no ability to recoup
                any amounts waived or expenses reimbursed under the contractual
                fee waiver discussed in Footnote 2 to the Fee Table.

3.   COMMENT:   The Staff noted that the Fund appears to invest in credit
                default swaps to a significant extent. The Staff suggested that
                the Registrant add disclosure to the





                Prospectus that highlights the extent of the Fund's use of
                credit default swaps and related risks.

     RESPONSE:  The Registrant notes that, as indicated in the Prospectus, the
                Fund has the flexibility to invest in a variety of derivative
                instruments, including but not limited to credit default swaps.
                The Registrant notes that it believes that the current
                disclosure accurately describes the Fund's use of credit default
                swaps and other derivative instruments, and that no additional
                disclosure is required. However, the Registrant will revise the
                second and third sentences of the Fund's principal investment
                strategy disclosure to highlight the Fund's use of credit
                default swaps, as follows: "The Fund holds long positions
                through the purchase and sale of debt instruments and THROUGH
                THE USE OF CREDIT DEFAULT SWAPS AND OTHER derivatives. The Fund
                gains short exposure to markets, sectors or instruments mainly
                through the use of CREDIT DEFAULT SWAPS AND OTHER derivatives."

4.   The Staff noted that the Registrant states that "derivative instruments
     that provide exposure to debt instruments or have similar economic
     characteristics may be used to satisfy the Fund's 80% policy."

a.   COMMENT:   The Staff requested that the Registrant clarify what
                derivatives it believes have similar economic characteristics to
                debt instruments.

     RESPONSE:  The Registrant notes that it will revise the disclosure to state
                that "derivative instruments that provide exposure to debt
                instruments or have similar economic characteristics, including
                but not limited to interest rate swaps, credit default swaps,
                and other derivatives, may be used to satisfy the Fund's 80%
                policy."

b.   COMMENT:   The Staff requested that the Registrant confirm how
                derivatives will be valued for purposes of complying with the
                Fund's 80% policy. The Staff noted that it is the Staff's
                position that market value should be used for this purpose.

     RESPONSE:  The Registrant confirms that the Fund currently uses the market
                value of derivatives for purposes of complying with the Fund's
                80% policy.

5.   COMMENT:   The Staff noted that the Registrant states that "the Fund may
                gain long and short exposure to individual sectors, markets,
                currencies or securities by investing in a variety of derivative
                instruments" and then lists multiple types of derivatives. The
                Staff noted that it is unclear to the Staff from the disclosure
                which types of derivatives the Fund principally invests in, and
                how the Fund uses derivatives to meet its investment objectives.
                The Staff referred the Registrant to the observations and
                concerns noted in the letter from Barry D. Miller, Associate
                Director, Division of Investment Management, SEC to Karrie
                McMillan, General Counsel, ICI (July 30, 2010) regarding
                derivatives related disclosure by

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                investment companies, and requested that the Registrant revise
                the disclosure as appropriate.

     RESPONSE:  The Registrant notes that, as indicated in the Prospectus, the
                Fund has the flexibility to invest in a variety of derivative
                instruments and will invest in a particular type of derivative
                instrument based on a number of factors. The Registrant notes
                that the Prospectus contains disclosure regarding specific
                derivatives instruments the Fund may use as part of its
                principal investment strategies, as well as the associated
                purposes of such use. The Registrant notes that it believes that
                the disclosure regarding the Fund's use of derivatives addresses
                the observations and concerns noted in the letter from the
                Division of Investment Management to the ICI regarding
                derivatives-related disclosure by investment companies.
                Accordingly, the Registrant submits that no change to the
                disclosure is required. However, the Registrant will revise the
                second and third sentences of the Fund's principal investment
                strategy disclosure to highlight the Fund's use of credit
                default swaps, as indicated in the response to Comment No. 3
                above.

6.   COMMENT:   The Staff requested that the Registrant review the risk
                disclosure responsive to Items 4 and 9 of Form N-1A in light of
                the general disclosure requirements of Form N-1A. In this
                respect, the Staff noted that the disclosure should be clear,
                concise and understandable, and include only as much information
                as is necessary for an average investor to understand the
                particular characteristics of the Fund.

     RESPONSE:  The Registrant notes that it believes that the disclosure
                referenced by the Staff accurately describes the risks
                associated with the Fund's investment strategies, and that no
                change to the disclosure is required.

7.   COMMENT:   The Staff noted that it read the Fund's Form N-CSR for the
                period ended February 28, 2015, including the Q&A with the
                Fund's portfolio managers. The Staff noted that, in its view,
                the Q&A portion of the Form N-CSR is more informative for retail
                investors and better enables them to understand the Fund's
                investment strategy than what is currently included in the
                Prospectus in response to Items 4 and 9 of Form N-1A. The Staff
                noted that, at the same time, the investment strategy described
                in the Form N-CSR appears at times to the Staff to be
                inconsistent with the Prospectus disclosure. The Staff noted
                that, for example, in the Q&A portion of the Form N-CSR, the
                Fund's portfolio managers indicate an investment approach in two
                distinct strategies. The Staff noted that one strategy is
                directional and the other involves relative value-based trading
                strategies, and noted that the portfolio managers also reference
                a risk budget and currency strategies. The Staff noted that the
                Prospectus refers to an alpha strategy and a beta strategy and
                noted that, in its view, it is not entirely clear how the
                discussion in the Form N-CSR reconciles with the discussion in
                the Fund's Prospectus. The Staff requested that the Registrant
                review its Items

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                4 and 9 disclosure to ensure that it is consistent with how the
                portfolio managers are currently managing the Fund.

     RESPONSE:  The Registrant notes that it believes that the disclosure in the
                Prospectus is consistent with the discussion in the Form N-CSR
                and with how the portfolio managers are currently managing the
                Fund. Accordingly, the Registrant respectfully submits that no
                change to the disclosure is required.

8.   COMMENT:   The Staff noted that in the Fund's Form N-CSR, the Fund's
                portfolio managers state that virtually all of the Fund's
                investment strategies are implemented through derivatives and,
                therefore, the Fund's performance will always be affected by
                derivatives. The Staff requested that the Registrant explain how
                the Fund's use of derivatives complies with the Fund's 80%
                policy, relevant Staff and Commission guidance, and is otherwise
                consistent with the Fund's disclosure.

     RESPONSE:  The Registrant notes that the discussion in the Fund's Form
                N-CSR refers to the use of derivatives in implementing the
                Fund's trading strategies, in terms of their effect on return
                and risk, and does not refer to the composition of the Fund's
                portfolio for purposes of the Fund's 80% policy. The Registrant
                notes that the Fund holds a substantial portfolio of debt
                securities in satisfaction of the Fund's 80% policy. To the
                extent that derivatives are also used to satisfy the Fund's 80%
                policy, the Registrant notes that the Staff has indicated that
                an investment company may include a synthetic instrument in the
                80% basket if it has economic characteristics similar to the
                securities included in that basket in the adopting release for
                Rule 35d-1 under the Investment Company Act of 1940, as amended
                (the "1940 Act"). Consistent with the Staff's guidance, the
                Registrant states in the Prospectus that "derivative instruments
                that provide exposure to debt instruments or have similar
                economic characteristics may be used to satisfy the Fund's 80%
                policy." Accordingly, the Registrant believes that the use of
                derivatives to satisfy the Fund's 80% policy is consistent with
                the 80% policy, relevant Staff and Commission guidance, and the
                Fund's disclosure.

9.   COMMENT:   The Staff requested that, given the extent of the Fund's credit
                default swap activities, the Registrant disclose in the
                Statement of Additional Information the Fund's segregation
                activities in the event the Fund is a buyer or seller of credit
                default swaps. The Staff requested that the Registrant confirm
                that, if the Fund sells credit default swaps, the Fund's
                segregation cover will be based on the notional value of the
                credit default swap contract.

     RESPONSE:  The Registrant notes that it will add a statement that "to the
                extent the Fund sells or writes credit default swaps, the Fund
                segregates liquid assets at least equal to the full notional
                value of such credit default swaps" to address the Staff's
                comment. However, the Registrant reserves the right to modify
                this approach in the future, including with respect to
                index-based credit default swaps, which are cash-settled, based
                on then-current market practice and applicable SEC Staff
                guidance.

10.  The Staff noted that the Fund's concentration policy states that "except as
     permitted by exemptive or other relief or permission from the SEC, SEC
     Staff or other authority of

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     competent jurisdiction, the Fund may not make any investment if, as a
     result, the Fund's investments will be concentrated in any one industry."

a.   COMMENT:   The Staff noted that, while the Fund's policy addresses
                concentration "in any one industry," Section 8(b) of the 1940
                Act requires the policy to address concentration in a particular
                industry or group of industries.

     RESPONSE:  The Registrant acknowledges the Staff's comment. The Registrant
                notes that it believes that the Fund's policy addresses the
                requirements of Section 8(b) of the 1940 Act. The Registrant
                also notes that the Fund's concentration policy cannot be
                changed without shareholder approval.

b.   COMMENT:   The Staff requested that the Registrant confirm that it will not
                change the Fund's concentration policy without a requisite
                shareholder vote.

     RESPONSE:  The Registrant confirms that it will not change the Fund's
                concentration policy without a requisite shareholder vote.

11.  COMMENT:   The Staff requested that the Registrant confirm that it will
                complete the tables in the Statement of Additional Information
                that provide additional information about the Fund's portfolio
                managers in the Registrant's Rule 485(b) filing with respect to
                the Fund.

     RESPONSE:  The Registrant confirms that it will complete the tables in the
                Statement of Additional Information that provide additional
                information about the Fund's portfolio managers in the
                Registrant's Rule 485(b) filing with respect to the Fund.

12.  The Staff noted that the Registrant states in the Description of Shares
     section in the Statement of Additional Information that its declaration of
     trust includes two fee-shifting provisions in connection with the bringing
     of derivative actions by shareholders.

a.   COMMENT:   The Staff requested that the Registrant indicate in its
                response when such fee-shifting provisions were added to the
                declaration of trust.

     RESPONSE:  The Registrant notes that shareholders of the Fund authorized
                the amendment of the Registrant's declaration of trust in 2008
                to include the fee-shifting provisions, among other changes.

b.   COMMENT:   The Staff requested that the Registrant indicate in its
                response whether the fee shifting provisions in the declaration
                of trust remain in effect following the adoption of recent
                legislation limiting fee-shifting provisions under the Delaware
                General Corporation Law and, if not, revise the disclosure.

     RESPONSE:  The Registrant notes that it is a Delaware statutory trust
                established under the Delaware Statutory Trust Act, and is not a
                corporation established under

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                Delaware General Corporation Law. The Registrant believes that
                the fee shifting provisions set forth in the declaration of
                trust are permitted under the Delaware Statutory Trust Act and
                remain in effect.

c.   COMMENT:   The Staff requested that the Registrant indicate whether such
                fee-shifting provisions apply to derivative actions under the
                Securities Laws and, if so, explain how such fee-shifting
                provisions are consistent with Sections 36 and 44 of the 1940
                Act, as well as the general principles behind Sections 1(b)(3),
                47(a) and 50 of the 1940 Act.

     RESPONSE:  The Registrant believes that the fee-shifting provisions apply
                to derivative actions under the Securities Laws. The Registrant
                notes that the fee-shifting provisions take effect only if: (1)
                a court determines that a demand that was rejected by a majority
                of the Independent Trustees as not being in the best interests
                of the Registrant was made without reasonable cause or for an
                improper purpose; or (2) a court determines that a derivative
                action that was dismissed by a court on the basis of failure to
                comply with the derivative action provisions of the declaration
                of trust was brought without reasonable cause or for an improper
                purpose. The Registrant believes that the fee-shifting
                provisions protect and benefit the Registrant and its
                shareholders and are, therefore, consistent with the Securities
                Laws, including the sections of the 1940 Act cited by the Staff.

     Please call the undersigned at (617) 951-8458 or Toby Serkin at (617)
951-8760 with any questions.

                                                Sincerely,

                                                /s/ Jeremy Kantrowitz
                                                ---------------------
                                                Jeremy Kantrowitz

cc:  Terrence J. Cullen
     Christopher J. Kelley
     Roger P. Joseph
     Toby R. Serkin

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