EX-99

Report of Independent Registered Public
Accounting Firm

To the Board of Trustees and the Shareholders of
Vanguard Explorer Fund

In planning and performing our audit of the financial
statements of Vanguard Explorer Fund (hereafter
referred to as the ?Trust?) as of and for the year
ended October 31, 2010, in accordance with the
standards of the Public Company Accounting
Oversight Board (United States), we considered the
Trust?s internal control over financial reporting,
including controls over safeguarding securities, as a
basis for designing our auditing procedures for the
purpose of expressing our opinion on the financial
statements and to comply with the requirements of
Form N-SAR, but not for the purpose of expressing
an opinion on the effectiveness of the Trust?s
internal control over financial reporting.
Accordingly, we do not express an opinion on the
effectiveness of the Trust's internal control over
financial reporting.

The management of the Trust is responsible for
establishing and maintaining effective internal
control over financial reporting.  In fulfilling this
responsibility, estimates and judgments by
management are required to assess the expected
benefits and related costs of controls.  A
company?s internal control over financial reporting is
a process designed to provide reasonable
assurance regarding the reliability of financial
reporting and the preparation of financial statements
for external purposes in accordance with generally
accepted accounting principles.  A company's
internal control over financial reporting includes
those policies and procedures that (1) pertain to the
maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and
dispositions of the assets of the company; (2)
provide reasonable assurance that transactions are
recorded as necessary to permit preparation of
financial statements in accordance with generally
accepted accounting principles, and that receipts
and expenditures of the company are being made
only in accordance with authorizations of
management and trustees of the company; and (3)
provide reasonable assurance regarding prevention
or timely detection of unauthorized acquisition, use
or disposition of a company?s assets that could
have a material effect on the financial statements.

Because of its inherent limitations, internal control
over financial reporting may not prevent or detect
misstatements.  Also, projections of any evaluation
of effectiveness to future periods are subject to the
risk that controls may become inadequate because
of changes in conditions, or that the degree of
compliance with the policies or procedures may
deteriorate.

A deficiency in internal control over financial
reporting exists when the design or operation of a
control does not allow management or employees,
in the normal course of performing their assigned
functions, to prevent or detect misstatements on a
timely basis.  A material weakness is a deficiency, or
a combination of deficiencies, in internal control
over financial reporting, such that there is a
reasonable possibility that a material misstatement
of the Trust's annual or interim financial statements
will not be prevented or detected on a timely basis.

Our consideration of the Trust?s internal control over
financial reporting was for the limited purpose
described in the first paragraph and would not
necessarily disclose all deficiencies in internal
control over financial reporting that might be material
weaknesses under standards established by the
Public Company Accounting Oversight Board
(United States).  However, we noted no deficiencies
in the Trust?s internal control over financial reporting
and its operation, including controls over
safeguarding securities that we consider to be
material weaknesses as defined above as of
October 31, 2010.

This report is intended solely for the information and
use of management and the Board of Trustees of
Vanguard Explorer Fund and the Securities and
Exchange Commission and is not intended to be
and should not be used by anyone other than these
specified parties.


PricewaterhouseCoopers LLP
December 14, 2010

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EX-99

Vanguard Explorer? Fund
Supplement to the Prospectus and Summary Prospectus Dated
February 24, 2010
Restructuring of Investment Advisory Team
The board of trustees of Vanguard Explorer Fund has restructured the Fund?s
investment advisory team, removing AXA Rosenberg Investment Management
LLC (AXA) as an investment advisor and reallocating the AXA assets among
some of the Fund?s other advisors.
Vanguard and the Fund?s other continuing investment advisors each
independently select and maintain a portfolio of common stocks for the Fund.
The Fund?s board of trustees has designated the proportion of Fund assets to
be managed by each advisor and may change these proportions at any time.
Investment Objective, Primary Investment Strategies, Primary Risks, and
Fees and Expenses
The Fund?s investment objective, primary investment strategies, and primary
risks will not change. The management expenses for the Investor Shares and
Admiral Shares are not expected to change as a result of the restructuring
of the Fund?s advisory team.
Prospectus Text Changes
All text references to AXA are deleted.
? 2010 The Vanguard Group, Inc. All rights reserved.
Vanguard Marketing Corporation, Distributor. PS24 082010