POWER OF ATTORNEY*
I hereby constitute and appoint each of Kimberly Maxwell and Brittany Roberts
signing singly, my true and lawful attorney-in-fact to:

(1)	execute for and on my behalf, in my capacity as an officer and/or director
of Forrester Research, Inc. (the "Company"), Forms 3, 4 and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;
(2)	do and perform any and all acts for and on my behalf that may be necessary
or desirable to complete and execute any such Form 3, 4 or 5 and timely file
such form with the United States Securities and Exchange Commission and any
stock exchange or similar authority; and
(3)	take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be to my benefit,
in my best interest, or that I am legally required to do, it being understood
that the documents executed by such attorney-in-fact on my behalf pursuant to
this Power of Attorney shall be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in such attorney-in-fact's
discretion.

I hereby grant to each such attorney-in-fact full power and authority to do and
perform any and every act and thing whatsoever requisite, necessary, or proper
to be done in the exercise of any of the rights and powers herein granted, as
fully to all intents and purposes as I might or could do if personally present,
with full power of substitution or revocation, hereby ratifying and confirming
all that such attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted.  I acknowledge that the
attorneys-in-fact, in serving in such capacity at my request, are not assuming,
nor is the Company assuming, any of my responsibilities to comply with Section
16 of the Securities Exchange Act of 1934. This Power of Attorney shall remain
in full force and effect until I am no longer required to file Forms 3, 4 and 5
with respect to my holdings of and transactions in Company securities, unless I
earlier revoke it in a signed writing delivered to the attorneys-in-fact.

IN WITNESS WHEREOF, I have caused this Power of Attorney to be executed as of
this 11th day of February, 2004.

/s/ Gail S. Mann
Signature

Gail S. Mann
Print Name

*  Drafter's Note:  In filing a Section 16(a) report on behalf of a reporting
person, an attorney-in-fact should indicate after the signature line on the form
that he or she is signing as such.  The Power of Attorney should be attached to
and filed with the report, if it has not previously been filed with the
Commission.  If it is not practicable to file the Power of Attorney at the time
of filing of the original report, it should be filed as soon as practicable as
an amendment to the original filing. The Power of Attorney need not be filed
with subsequent reports.