[VANGUARD SHIP LOGO/R/]

                                                    P.O. Box 2600
                                                    Valley Forge, PA 19482-2600
                                                    610-669-4294
                                                    Michael_Drayo@vanguard.com

July 11, 2008

Christian Sandoe, Esq.
U.S. Securities & Exchange Commission                     via electronic filing
100 F Street, N.E.
Washington, DC  20549

RE:      Vanguard Montgomery Funds
         File No. 333-145624

Dear Mr. Sandoe,

This letter responds to your July 7, 2008 comments on Post-Effective Amendment
No. 1 to the above-referenced registrant's registration statement that was filed
on May 23, 2008.


Comment 1:        Prospectus - Fund Profile - Primary Risks
- --------------------------------------------------------------------------------
Comment:          Please clarify what is meant by the bracketed language under
                  Investment risk.

Response:         The bracketed language is meant to disclose that the bottom-up
                  investment approach used by the Fund's advisors may
                  intentionally or unintentionally increase the Fund's
                  investment risk. For example, an advisor may select stocks for
                  the long portfolio that are value oriented, and select stocks
                  for the short portfolio that are growth oriented. The
                  selection of stocks with a value or growth orientation may be
                  intentional or unintentional. In this case, if growth oriented
                  stocks perform better than value oriented stocks, the Fund's
                  investment risk may increase.

Comment 2:        Prospectus - Fund Profile Performance/Risk Information
- --------------------------------------------------------------------------------
Comment:          Please clarify that the performance shown in the performance
                  bar chart and table for periods prior to the date that
                  the Fund was reorganized as a Vanguard fund is the performance
                  of the Fund's predecessor fund, the Laudus Rosenberg
                  U.S. Large/Mid Capitalization Long/Short Equity Fund.

Response:         We have made the requested clarification.

Comment 3:        Prospectus - Plain Talk About Market Neutral Investing
- --------------------------------------------------------------------------------
Comment:          Please clarify whether the short portion of the Fund's
                  portfolio is expected to deliver the overall returns of the
                  stock market, plus additional performance unique to the
                  specific stocks the advisor has sold short.

Response:         The short portion of the Fund's portfolio is expected to
                  deliver the inverse of the overall returns of the stock
                  market, plus additional performance unique to the specific
                  stocks the advisor has sold short. We have updated the
                  prospectus accordingly.


Comment 4:        Prospectus - Investing With Vanguard - Frequent-Trading Limits
- --------------------------------------------------------------------------------
Comment:          Please clarify whether the Fund's frequent trading policy
                  applies to accounts that are under common control of the
                  investor, such as a joint account with the investor's spouse.

Response:         The Fund's frequent trading policy is applied on an account by
                  account basis. For example, if an investor redeemed or
                  exchanged shares of a Fund in an individual account, the
                  investor would not be prohibited from purchasing shares in the
                  same Fund within 60 days of the previous redemption or
                  exchange if the transaction is conducted in a joint account
                  with the investor's spouse. The current disclosure accurately
                  reflects the Fund's policy.

Comment 5:        Tandy Requirements
- --------------------------------------------------------------------------------
As required by the SEC, the Fund acknowledges that:

- -    The Fund is responsible  for the adequacy and accuracy of the disclosure in
     the filing.

- -    Staff  comments  or changes in  response  to staff  comments in the filings
     reviewed  by the staff do not  foreclose  the  Commission  from  taking any
     action with respect to the filing.

- -    The Fund may not  assert  staff  comments  as a defense  in any  proceeding
     initiated by the Commission or any person under the federal securities laws
     of the United States.


Please contact me at 610-669-4294 with any questions or comments regarding the
above responses. Thank you.

Sincerely,


Michael J. Drayo
Associate Counsel
The Vanguard Group
Securities Regulation, Legal Department