April 28, 2010

Ms. Laura E. Hatch
United States Securities and Exchange Commission
Division of Investment Management
100 F Street, N.E.
Washington, DC 20549

Re:      The GAMCO Growth Fund (the "Fund")
         Post-Effective Amendment No. 29 to the Registration Statement
         on Form N-1A (33-10583)

Dear. Ms. Hatch:

         This letter  responds to your  comments  communicated  by  telephone on
April 7,  2010,  with  respect  to the  Post-Effective  Amendment  No. 29 to the
Registration  Statement on Form N-1A (the "Registration  Statement") of the Fund
that was filed  with the  Securities  and  Exchange  Commission  (the  "SEC") on
February 26, 2010 (accession number 0000950123-10-017791).

         In addition, in connection with this filing, the Fund hereby states the
following:

         1.       The Fund  acknowledges  that in  connection  with the comments
                  made by the Staff of the SEC,  the Staff has not passed on the
                  accuracy or adequacy of the  disclosure  made herein,  and the
                  Fund and its management are solely responsible for the content
                  of such disclosure;

         2.       The Fund acknowledges  that the Staff's comments,  and changes
                  in  disclosure  in response to the  Staff's  comments,  do not
                  foreclose   the  SEC  or  other   regulatory   body  from  the
                  opportunity  to seek  enforcement  or take other  action  with
                  respect to the disclosure made herein; and

         3.       The Fund  represents  that neither it nor its management  will
                  assert  the  Staff's  comments  or changes  in  disclosure  in
                  response to the Staff's comments as a defense in any action or
                  proceeding by the SEC or any person.

                  The Fund's  responses to your  comments are  reflected  below.
         Comments that applied to both the Class AAA Shares  prospectus  and the
         Class  ABCI  Shares  prospectus  have only  been  addressed  once.  The
         substance  of  your  comments  has  been  restated  for  your  ease  of
         reference.



         COMMENT  #1-Cover  Page:  You  requested  that the Fund  pare  down the
         information  in  the  top  left  hand  corner  to  remove   duplicative
         references.

                  RESPONSE #1: The Fund has deleted the following  parenthetical
                  language that appears at the end of the  disclosure in the top
                  left hand corner:  "(Net Asset Value per share may be obtained
                  daily by calling 800-GABELLI after 7:00 p.m.)."

         COMMENT  #2-COVER  PAGE:  You requested  that the Fund add the required
         legend disclosure if the Fund intends to utilize a summary prospectus.

                  RESPONSE  #2:  The  Fund  will  not  be  utilizing  a  summary
                  prospectus  at this time and therefore the legend has not been
                  added.

         COMMENT  #3-PRINCIPAL  INVESTMENT  STRATEGIES:  You inquired  about the
         quality  ratings  associated  with investing in securities  that may be
         converted into common stock. If the ratings are below  investment grade
         but the Fund does not hold a  significant  portion of its  portfolio in
         securities that may be converted into common stock,  you requested that
         the Fund move the  disclosure  to Item 9, as well as disclose the risks
         of investing in below  investment grade  convertible  securities in the
         "Information  About  the  Fund's  Investment   Objectives,   Investment
         Strategies, and Related Risks" section.

                  RESPONSE #3: The Fund does not invest a significant portion of
                  its portfolio in convertible securities; consequently the Fund
                  has removed the following language from the first paragraph of
                  the "Principal  Investment  Strategies" section: "and may also
                  invest  in  securities  that  may  be  converted  into  common
                  stocks."

                  As a  conforming  change,  the Fund also has revised the first
                  sentence  of  the  fourth   paragraph   under  the  "Principal
                  Investment Strategies" to read:

                  "The Fund's assets will be invested primarily in a broad range
                  of readily  marketable equity securities  consisting of common
                  stock and preferred stock."

                  The Fund has added the following under  "Investing in the Fund
                  involves the following risks:":

                  o CONVERTIBLE  SECURITIES AND CREDIT RISK. The characteristics
                  of convertible  securities make them  appropriate  investments
                  for  investors  who seek a high level of total return with the
                  addition of credit  risk.  These  characteristics  include the
                  potential  for  capital  appreciation  if  the  value  of  the
                  underlying  common stock increases,  the relatively high yield
                  received  from  dividend or  interest  payments as compared to
                  common  stock


                  dividends,  and decreased risks of decline in value,  relative
                  to the  underlying  common  stock  due to their  fixed  income
                  nature. As a result of the conversion  feature,  however,  the
                  interest rate or dividend preference on a convertible security
                  is  generally  less than  would be the case if the  securities
                  were not convertible. During periods of rising interest rates,
                  the potential for capital gain on a convertible security might
                  be less than that of a common stock equivalent if the yield on
                  the convertible  security is at a level that causes it to sell
                  at a  discount.  Any  common  stock or other  equity  security
                  received by conversion will not be included in the calculation
                  of the  percentage  of total  assets  invested in  convertible
                  securities.

         COMMENT  #4-PERFORMANCE  TABLE:  You requested that the Fund delete the
         second  sentence in the  paragraph  that  discusses  after-tax  returns
         regarding "Return After Taxes on Distributions and Sale of Fund Shares"
         if it is not applicable for the Fund.

                  RESPONSE #4: This disclosure is applicable to the Fund.

         COMMENT  #5-STATEMENT OF ADDITIONAL  INFORMATION ("SAI"): You requested
         that the Fund  include the new  corporate  governance  and board member
         disclosure.

                  RESPONSE #5: The Fund will include such disclosure in the SAI.

         Should you have any questions  regarding the  foregoing,  please do not
         hesitate  to  contact  Helen  A.  Robichaud  at PNC  Global  Investment
         Servicing, Inc., the Fund's Sub-Administrator, at 617-338-4595.

         Very truly yours,

         /s/ Bruce N. Alpert
         -------------------
         Bruce N. Alpert
         President

         cc: Helen A. Robichaud         Arlene Lonergan
             PNC Global Investment      PNC Global Investment
             Servicing, Inc.            Servicing, Inc.

             Peter D. Goldstein         Richard Prins
             Gabelli Funds, LLC         Skadden, Arps, Slate, Meagher & Flom LLP

             Leslie Lowenbraun
             Skadden, Arps, Slate, Meagher & Flom LLP