UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

   CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number 811-04873
                                                     ---------

                              The GAMCO Growth Fund
                ------------------------------------------------
               (Exact name of registrant as specified in charter)

                              One Corporate Center
                            Rye, New York 10580-1422
                ------------------------------------------------
               (Address of principal executive offices) (Zip code)

                                 Bruce N. Alpert
                               Gabelli Funds, LLC
                              One Corporate Center
                            Rye, New York 10580-1422
                ------------------------------------------------
                     (Name and address of agent for service)


       registrant's telephone number, including area code: 1-800-422-3554
                                                          ---------------

                      Date of fiscal year end: December 31
                                              ------------

                     Date of reporting period: June 30, 2006
                                              --------------


Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the  transmission to stockholders of
any report that is required to be transmitted to  stockholders  under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1).  The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant  is required to disclose the  information  specified by Form N-CSR,
and the  Commission  will make this  information  public.  A  registrant  is not
required to respond to the  collection  of  information  contained in Form N-CSR
unless the Form  displays a  currently  valid  Office of  Management  and Budget
("OMB")  control number.  Please direct comments  concerning the accuracy of the
information  collection  burden  estimate and any  suggestions  for reducing the
burden to  Secretary,  Securities  and Exchange  Commission,  100 F Street,  NE,
Washington,  DC 20549. The OMB has reviewed this collection of information under
the clearance requirements of 44 U.S.C. ss. 3507.







ITEM 1. REPORTS TO STOCKHOLDERS.

The Report to Shareholders is attached herewith.


                             THE GAMCO GROWTH FUND

                               SEMI-ANNUAL REPORT
                                 JUNE 30, 2006






TO OUR SHAREHOLDERS,

      During the second  quarter of 2006,  The GAMCO  Growth  Fund (the  "Fund")
declined  4.0%,  while the Russell  1000 Growth  Index and the Standard & Poor's
("S&P")  500 Index  were down  3.9% and  1.4%,  respectively.  For the six month
period ended June 30, 2006, the Fund declined 0.5% versus a loss of 0.9% for the
Russell 1000 Growth Index and a gain of 2.7% for the S&P 500 Index.

      Enclosed are the financial  statements and the investment  portfolio as of
June 30, 2006.



COMPARATIVE RESULTS
- ---------------------------------------------------------------------------------------------------------------------
                                           AVERAGE ANNUAL RETURNS THROUGH JUNE 30, 2006 (A)
                                           ------------------------------------------------
                                                                                                              Since
                                              Year to                                                       Inception
                                   Quarter     Date     1 Year    3 Year     5 Year    10 Year    15 Year   (4/10/87)
                                   -------     ----     ------    ------     ------    -------    -------   ---------
                                                                                    
  GAMCO GROWTH FUND CLASS AAA .... (3.95)%    (0.49)%   10.02%    10.69%     (1.66)%    7.16%     9.62%     11.40%

  S&P 500 Index .................. (1.44)      2.71      8.62     11.21       2.49      8.32     10.73      10.32
  Russell 1000 Growth Index ...... (3.90)     (0.93)     6.12      8.35      (0.76)     5.42      N/A*       N/A*

  Class A ........................ (3.98)     (0.49)    10.01     10.70      (1.65)     7.17      9.62      11.41
                                   (9.50)(b)  (6.21)(b)  3.69(b)   8.54(b)   (2.81)(b)  6.53(b)   9.19(b)   11.07(b)
  Class B ........................ (4.16)     (0.85)     9.20     10.00      (2.03)     6.96      9.48      11.30
                                   (8.95)(c)  (5.80)(c)  4.20(c)   9.17(c)   (2.42)(c)  6.96(c)   9.48(c)   11.30(c)
  Class C ........................ (4.12)     (0.85)     9.20     10.00      (2.03)     6.96      9.48      11.30
                                   (5.08)(c)  (1.84)(c)  8.20(c)  10.00(c)   (2.03)(c)  6.96(c)   9.48(c)   11.30(c)

- --------------------------------------------------------------------------------
(a) RETURNS  REPRESENT PAST  PERFORMANCE  AND DO NOT GUARANTEE  FUTURE  RESULTS.
    TOTAL RETURNS AND AVERAGE ANNUAL RETURNS  REFLECT CHANGES IN SHARE PRICE AND
    REINVESTMENT OF DISTRIBUTIONS  AND ARE NET OF EXPENSES.  INVESTMENT  RETURNS
    AND THE PRINCIPAL  VALUE OF AN INVESTMENT  WILL  FLUCTUATE.  WHEN SHARES ARE
    REDEEMED,  THEY  MAY BE  WORTH  MORE  OR  LESS  THAN  THEIR  ORIGINAL  COST.
    PERFORMANCE  RETURNS  FOR  PERIODS  LESS  THAN ONE YEAR ARE NOT  ANNUALIZED.
    CURRENT  PERFORMANCE  MAY BE  LOWER OR  HIGHER  THAN  THE  PERFORMANCE  DATA
    PRESENTED.  VISIT WWW.GABELLI.COM FOR PERFORMANCE INFORMATION AS OF THE MOST
    RECENT  MONTH  END.  INVESTORS  SHOULD  CAREFULLY  CONSIDER  THE  INVESTMENT
    OBJECTIVES,  RISKS, CHARGES, AND EXPENSES OF THE FUND BEFORE INVESTING.  THE
    PROSPECTUS CONTAINS MORE INFORMATION ABOUT THIS AND OTHER MATTERS AND SHOULD
    BE READ CAREFULLY BEFORE INVESTING.
    THE CLASS AAA SHARES' NET ASSET VALUES ARE USED TO CALCULATE PERFORMANCE FOR
    THE PERIODS  PRIOR TO THE  ISSUANCE OF CLASS A SHARES,  CLASS B SHARES,  AND
    CLASS C SHARES ON DECEMBER 31, 2003. THE ACTUAL  PERFORMANCE FOR THE CLASS B
    SHARES  AND  CLASS C SHARES  WOULD  HAVE BEEN  LOWER  DUE TO THE  ADDITIONAL
    EXPENSES  ASSOCIATED WITH THESE CLASSES OF SHARES. THE S&P 500 INDEX AND THE
    RUSSELL  1000  GROWTH  INDEX  ARE  UNMANAGED   INDICATORS  OF  STOCK  MARKET
    PERFORMANCE. DIVIDENDS ARE REINVESTED.
(b) INCLUDES THE EFFECT OF THE MAXIMUM  5.75% SALES  CHARGE AT THE  BEGINNING OF
    THE PERIOD.
(c) INCLUDES THE EFFECT OF THE  APPLICABLE  CONTINGENT  DEFERRED SALES CHARGE AT
    THE END OF THE  PERIOD  SHOWN FOR CLASS B AND CLASS C SHARES,  RESPECTIVELY.
    CLASS B SHARES ARE NOT AVAILABLE FOR NEW PURCHASES.
*   THERE IS NO DATA AVAILABLE FOR THE RUSSELL 1000 GROWTH INDEX PRIOR TO AUGUST
    31, 1992.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
  We have  separated  the  portfolio  manager's  commentary  from the  financial
  statements and investment  portfolio due to corporate  governance  regulations
  stipulated by the Sarbanes-Oxley Act of 2002. We have done this to ensure that
  the  content  of the  portfolio  manager's  commentary  is  unrestricted.  The
  financial  statements and investment  portfolio are mailed separately from the
  commentary.  Both the commentary and the financial  statements,  including the
  portfolio   of   investments,   will   be   available   on  our   website   at
  www.gabelli.com/funds.
- --------------------------------------------------------------------------------



THE GAMCO GROWTH FUND
DISCLOSURE OF FUND EXPENSES (UNAUDITED)
For  the Six Month Period from January 1, 2006 through June 30, 2006
                                                                   EXPENSE TABLE
- --------------------------------------------------------------------------------
We believe it is important for you to understand the impact of fees and expenses
regarding  your  investment.  All mutual  funds have  operating  expenses.  As a
shareholder  of a fund,  you  incur  ongoing  costs,  which  include  costs  for
portfolio  management,  administrative  services,  and shareholder reports (like
this one), among others.  Operating  expenses,  which are deducted from a fund's
gross income,  directly  reduce the investment  return of a fund.  When a fund's
expenses are expressed as a percentage of its average net assets, this figure is
known as the expense  ratio.  The  following  examples  are intended to help you
understand  the  ongoing  costs (in  dollars) of  investing  in your Fund and to
compare these costs with those of other mutual funds.  The examples are based on
an  investment  of $1,000 made at the beginning of the period shown and held for
the entire period.

The Expense Table below illustrates your Fund's costs in two ways:

ACTUAL FUND  RETURN:  This section  provides  information  about actual  account
values and actual expenses. You may use this section to help you to estimate the
actual  expenses that you paid over the period after any fee waivers and expense
reimbursements.  The "Ending  Account  Value"  shown is derived  from the Fund's
ACTUAL return during the past six months,  and the "Expenses Paid During Period"
shows the dollar  amount  that would have been paid by an  investor  who started
with $1,000 in the Fund. You may use this information,  together with the amount
you invested, to estimate the expenses that you paid over the period.

To do so, simply  divide your account  value by $1,000 (for  example,  an $8,600
account value  divided by $1,000 = 8.6),  then multiply the result by the number
given for your Fund under the heading  "Expenses Paid During Period" to estimate
the expenses you paid during this period.

HYPOTHETICAL 5% RETURN:  This section provides  information  about  hypothetical
account  values and  hypothetical  expenses  based on the Fund's actual  expense
ratio. It assumes a hypothetical  annualized return of 5% before expenses during
the period shown. In this case - because the hypothetical return used is NOT the
Fund's  actual  return - the  results  do not apply to your  investment  and you
cannot use the  hypothetical  account  value and expense to estimate  the actual
ending  account  balance or expenses  you paid for the period.  This  example is
useful in making  comparisons  of the ongoing costs of investing in the Fund and
other  funds.  To do so,  compare  this  5%  hypothetical  example  with  the 5%
hypothetical examples that appear in shareholder reports of other funds.

Please note that the  expenses  shown in the table are meant to  highlight  your
ongoing  costs only and do not  reflect  any  transactional  costs such as sales
charges (loads),  redemption fees, or exchange fees, if any, which are described
in the Prospectus. If these costs were applied to your account, your costs would
be higher.  Therefore, the 5% hypothetical return is useful in comparing ongoing
costs only,  and will not help you determine the relative  total costs of owning
different funds. The "Annualized  Expense Ratio"  represents the actual expenses
for the last six  months  and may be  different  from the  expense  ratio in the
Financial Highlights which is for the six months ended June 30, 2006.

                 Beginning        Ending       Annualized    Expenses
               Account Value   Account Value    Expense    Paid During
                 01/01/06        06/30/06        Ratio       Period*
- --------------------------------------------------------------------------------
THE GAMCO GROWTH FUND
- --------------------------------------------------------------------------------
ACTUAL FUND RETURN
Class AAA       $1,000.00       $  995.10        1.49%       $ 7.37
Class A         $1,000.00       $  995.10        1.49%       $ 7.37
Class B         $1,000.00       $  991.50        2.24%       $11.06
Class C         $1,000.00       $  991.50        2.24%       $11.06
HYPOTHETICAL 5% RETURN
Class AAA       $1,000.00       $1,017.41        1.49%       $ 7.45
Class A         $1,000.00       $1,017.41        1.49%       $ 7.45
Class B         $1,000.00       $1,013.69        2.24%       $11.18
Class C         $1,000.00       $1,013.69        2.24%       $11.18

* Expenses  are equal to the Fund's  annualized  expense  ratio for the last six
  months multiplied by the average account value over the period,  multiplied by
  the number of days in the most recent fiscal half-year, then divided by 365.


                                       2


SUMMARY OF PORTFOLIO HOLDINGS (UNAUDITED)

The following table presents portfolio holdings as a percent of total net assets
as of June 30, 2006:

THE GAMCO GROWTH FUND

Financial .........................................  14.4%
Industrial ........................................  14.1%
Energy ............................................  13.1%
Software & Services ...............................  13.1%
Consumer Staples ..................................  12.2%
Health Care Equipment & Services ..................   7.2%
Pharmaceuticals & Biotechnology ...................   5.3%
Retail ............................................   5.0%
Materials .........................................   2.9%
Semiconductors ....................................   2.9%
Media .............................................   2.2%
Communications Equipment ..........................   2.0%
U.S. Treasury Bills ...............................   1.8%
Hotels and Gaming .................................   1.8%
Computers & Peripheral ............................   1.4%
Auto & Components .................................   0.6%
Telecommunications ................................   0.3%
Other Assets and Liabilities (Net) ................  (0.3)%
                                                    ------
                                                    100.0%
                                                    ======



THE FUND FILES A COMPLETE  SCHEDULE OF PORTFOLIO  HOLDINGS  WITH THE SEC FOR THE
FIRST AND THIRD  QUARTERS OF EACH FISCAL YEAR ON FORM N-Q, THE LAST OF WHICH WAS
FILED FOR THE  QUARTER  ENDING  MARCH 31,  2006.  SHAREHOLDERS  MAY OBTAIN  THIS
INFORMATION   AT   WWW.GABELLI.COM   OR  BY  CALLING  THE  FUND  AT  800-GABELLI
(800-422-3554).  THE  FUND'S  FORM N-Q IS  AVAILABLE  ON THE  SEC'S  WEBSITE  AT
WWW.SEC.GOV  AND MAY ALSO BE  REVIEWED  AND  COPIED AT THE  COMMISSION'S  PUBLIC
REFERENCE  ROOM IN  WASHINGTON,  DC.  INFORMATION ON THE OPERATION OF THE PUBLIC
REFERENCE ROOM MAY BE OBTAINED BY CALLING 1-800-SEC-0330.



PROXY VOTING

The Fund files Form N-PX with its complete proxy voting record for the 12 months
ended June 30th,  no later than August 31st of each year. A  description  of the
Fund's  proxy  voting  policies,  procedures,  and how the  Fund  voted  proxies
relating to portfolio  securities is available without charge, upon request, (i)
by calling 800-GABELLI  (800-422-3554);  (ii) by writing to The Gabelli Funds at
One Corporate Center,  Rye, NY 10580-1422;  and (iii) by visiting the Securities
and Exchange Commission's website at www.sec.gov.







                                       3


THE GAMCO GROWTH FUND
SCHEDULE OF INVESTMENTS -- JUNE 30, 2006 (UNAUDITED)
- --------------------------------------------------------------------------------

                                                                      MARKET
   SHARES                                              COST           VALUE
   ------                                              ----           ------

             COMMON STOCKS -- 98.5%
             CONSUMER DISCRETIONARY -- 9.6%
             AUTO & COMPONENTS -- 0.6%
   65,000    Harley-Davidson Inc. ................. $  3,103,572 $    3,567,850
   35,000    PACCAR Inc. ..........................    2,688,047      2,883,300
                                                    ------------ --------------
                                                       5,791,619      6,451,150
                                                    ------------ --------------
             HOTELS AND GAMING -- 1.8%
  140,000    Boyd Gaming Corp. ....................    6,809,155      5,650,400
   50,000    Hilton Hotels Corp. ..................    1,435,487      1,414,000
   65,000    Las Vegas Sands Corp.+ ...............    3,138,604      5,060,900
   50,000    Marriott International Inc., Cl. A ...    1,850,822      1,906,000
   10,000    MGM Mirage+ ..........................      461,368        408,000
   20,000    Starwood Hotels & Resorts Worldwide Inc.  1,245,751      1,206,800
   30,000    Station Casinos Inc. .................    2,334,008      2,042,400
                                                    ------------ --------------
                                                      17,275,195     17,688,500
                                                    ------------ --------------
             MEDIA -- 2.2%
  150,000    McGraw-Hill Companies Inc. ...........    3,798,929      7,534,500
  210,000    News Corp., Cl. B ....................    4,077,630      4,237,800
  590,000    Time Warner Inc. .....................    8,983,471     10,207,000
                                                    ------------ --------------
                                                      16,860,030     21,979,300
                                                    ------------ --------------
             RETAIL -- 5.0%
   60,000    Bed Bath & Beyond Inc.+ ..............    2,495,780      1,990,200
   45,000    Best Buy Co. Inc. ....................    1,740,507      2,467,800
  215,000    Cheesecake Factory Inc.+ .............    5,475,834      5,794,250
  120,000    Chico's FAS Inc.+ ....................    4,862,592      3,237,600
   90,000    Coach Inc.+ ..........................    2,173,159      2,691,000
   50,000    Costco Wholesale Corp. ...............    2,306,609      2,856,500
   65,000    Kohl's Corp.+ ........................    3,619,108      3,842,800
   20,000    Staples Inc. .........................      535,024        486,400
   80,000    Starbucks Corp.+ .....................    1,803,156      3,020,800
  155,000    Target Corp. .........................    6,785,649      7,574,850
  206,577    The Home Depot Inc. ..................    5,685,167      7,393,391
  213,400    Tiffany & Co. ........................    5,707,333      7,046,468
  150,000    Urban Outfitters Inc.+ ...............    4,576,941      2,623,500
                                                    ------------ --------------
                                                      47,766,859     51,025,559
                                                    ------------ --------------
             TOTAL CONSUMER DISCRETIONARY .........   87,693,703     97,144,509
                                                    ------------ --------------
             CONSUMER STAPLES -- 12.2%
   30,000    Cadbury Schweppes plc, ADR ...........    1,225,209      1,164,600
  230,000    Groupe Danone, ADR ...................    5,162,291      6,134,100
   60,000    Nestle SA, ADR .......................    4,446,450      4,702,038
  450,000    PepsiCo Inc. .........................   22,100,648     27,018,000
  485,000    Procter & Gamble Co. .................   26,316,250     26,966,000
  190,000    The Hershey Co. ......................   10,419,937     10,463,300
  280,000    Wal-Mart Stores Inc. .................   14,757,160     13,487,600

                                                                      MARKET
   SHARES                                              COST           VALUE
   ------                                              ----           ------
  530,000    Walgreen Co. ......................... $ 16,456,457 $   23,765,200
   20,000    Whole Foods Market Inc. ..............      813,800      1,292,800
  170,000    Wm. Wrigley Jr. Co. ..................    9,007,043      7,711,200
   26,250    Wm. Wrigley Jr. Co., Cl. B ...........    1,574,598      1,189,125
                                                    ------------ --------------
             TOTAL CONSUMER STAPLES ...............  112,279,843    123,893,963
                                                    ------------ --------------
             ENERGY -- 13.1%
   90,000    Anadarko Petroleum Corp. .............    4,501,909      4,292,100
   61,000    Apache Corp. .........................    1,970,404      4,163,250
   50,000    Baker Hughes Inc. ....................    2,616,718      4,092,500
   20,000    BJ Services Co. ......................      832,807        745,200
   70,000    Canadian Natural Resources Ltd. ......    3,271,408      3,876,600
  175,000    Chesapeake Energy Corp. ..............    5,510,383      5,293,750
   12,463    ConocoPhillips .......................      573,368        816,700
   85,000    Devon Energy Corp. ...................    3,965,184      5,134,850
   40,000    EnCana Corp. .........................    2,000,275      2,105,600
   75,000    EOG Resources Inc. ...................    5,968,368      5,200,500
  110,000    Halliburton Co. ......................    8,120,821      8,163,100
  135,000    Hess Corp. ...........................    6,180,309      7,134,750
  110,000    Kerr-McGee Corp. .....................    5,592,359      7,628,500
  125,000    McDermott International Inc.+ ........    4,840,905      5,683,750
   55,000    Murphy Oil Corp. .....................    2,242,801      3,072,300
   90,000    National-Oilwell Varco Inc.+ .........    5,380,325      5,698,800
   70,000    Occidental Petroleum Corp. ...........    6,770,263      7,178,500
  195,000    Peabody Energy Corp. .................    7,540,805     10,871,250
  123,000    Pioneer Natural Resources Co. ........    5,957,898      5,708,430
   50,000    Sasol Ltd., ADR ......................    2,070,546      1,932,000
  158,000    Schlumberger Ltd. ....................    5,142,155     10,287,380
  100,000    Southwestern Energy Co.+ .............    2,990,550      3,116,000
   44,000    Suncor Energy Inc. ...................    1,541,174      3,564,440
   60,000    Transocean Inc.+ .....................    2,410,948      4,819,200
   95,000    Valero Energy Corp. ..................    4,660,313      6,319,400
  130,000    XTO Energy Inc. ......................    5,524,477      5,755,100
                                                    ------------ --------------
             TOTAL ENERGY .........................  108,177,473    132,653,950
                                                    ------------ --------------
             FINANCIAL -- 14.4%
   80,000    Affiliated Managers Group Inc.+ ......    7,835,936      6,951,200
  315,000    American Express Co. .................   13,426,012     16,764,300
   80,000    American International Group Inc. ....    5,266,518      4,724,000
   53,100    China Life Insurance Co. Ltd., ADR ...    3,297,347      3,361,230
  560,000    Citigroup Inc. .......................   25,839,355     27,014,400
  125,000    Commerce Bancorp Inc. ................    4,438,042      4,458,750
  250,000    Credit Suisse Group, ADR .............   13,747,905     13,997,500
   60,000    Goldman Sachs Group Inc. .............    8,269,505      9,025,800

                 See accompanying notes to financial statements.

                                       4


THE GAMCO GROWTH FUND
SCHEDULE OF INVESTMENTS (CONTINUED) -- JUNE 30, 2006 (UNAUDITED)
- --------------------------------------------------------------------------------

                                                                      MARKET
   SHARES                                              COST           VALUE
   ------                                              ----           ------
             COMMON STOCKS (CONTINUED)
             FINANCIAL (CONTINUED)
   30,000    HSBC Holdings plc, ADR ............... $  2,706,890 $    2,650,500
   75,000    Legg Mason Inc. ......................    8,598,925      7,464,000
  145,000    Merrill Lynch & Co. Inc. .............    6,330,411     10,086,200
   30,000    Moody's Corp. ........................    1,640,558      1,633,800
  195,900    Northern Trust Corp. .................   11,288,088     10,833,270
  188,800    State Street Corp. ...................    9,069,793     10,967,392
   50,000    T. Rowe Price Group Inc. .............    2,040,354      1,890,500
  125,000    UBS AG ...............................   10,834,255     13,712,500
                                                    ------------ --------------
             TOTAL FINANCIAL ......................  134,629,894    145,535,342
                                                    ------------ --------------
             HEALTH CARE -- 12.5%
             HEALTH CARE EQUIPMENT & SERVICES -- 7.2%
   90,000    Alcon Inc. ...........................    8,545,175      8,869,500
  150,000    Biomet Inc. ..........................    6,321,694      4,693,500
  110,000    Edwards Lifesciences Corp.+ ..........    4,543,567      4,997,300
   35,000    IDEXX Laboratories Inc.+ .............    2,225,465      2,629,550
   70,000    Lincare Holdings Inc.+ ...............    3,008,947      2,648,800
  135,000    Medtronic Inc. .......................    6,189,982      6,334,200
   60,000    Quest Diagnostics Inc. ...............    3,496,844      3,595,200
  280,000    St. Jude Medical Inc.+ ...............    9,446,144      9,077,600
  220,000    Stryker Corp. ........................   10,945,256      9,264,200
  100,000    UnitedHealth Group Inc. ..............    3,812,352      4,478,000
  120,000    Varian Medical Systems Inc.+ .........    4,796,238      5,682,000
  195,000    Zimmer Holdings Inc.+ ................   14,311,699     11,060,400
                                                    ------------ --------------
                                                      77,643,363     73,330,250
                                                    ------------ --------------
             PHARMACEUTICALS & BIOTECHNOLOGY -- 5.3%
  218,000    Amgen Inc.+ ..........................   14,589,356     14,220,140
  105,000    Eli Lilly & Co. ......................    6,089,099      5,803,350
  165,000    Genentech Inc.+ ......................   11,078,269     13,497,000
  100,000    Genzyme Corp.+ .......................    5,739,755      6,105,000
   70,000    Gilead Sciences Inc.+ ................    4,481,872      4,141,200
  164,000    Johnson & Johnson ....................    8,665,669      9,826,880
                                                    ------------ --------------
                                                      50,644,020     53,593,570
                                                    ------------ --------------
             TOTAL HEALTH CARE ....................  128,287,383    126,923,820
                                                    ------------ --------------
             INDUSTRIAL -- 14.1%
   90,000    3M Co. ...............................    7,378,186      7,269,300
   55,000    C.H. Robinson Worldwide Inc. .........    1,257,189      2,931,500
   75,000    Caterpillar Inc. .....................    3,331,977      5,586,000
  130,000    Emerson Electric Co. .................   10,996,470     10,895,300
  50,000     Expeditors International of
               Washington Inc. ....................    1,228,395      2,800,500
   45,000    FedEx Corp. ..........................    5,257,016      5,258,700
   35,000    Fluor Corp. ..........................    1,629,609      3,252,550
  162,000    General Dynamics Corp. ...............    5,670,262     10,604,520
1,295,000    General Electric Co. .................   45,058,905     42,683,200
   90,000    Ingersoll-Rand Co. Ltd., Cl. A .......    3,668,937      3,850,200


                                                                      MARKET
     SHARES                                            COST           VALUE
     ------                                            ----           ------

  300,000    ITT Industries Inc. .................. $ 13,764,080 $   14,850,000
   95,000    L-3 Communications Holdings Inc. .....    4,346,496      7,164,900
   95,000    Rockwell Automation Inc. .............    5,919,823      6,840,950
   60,000    United Parcel Service Inc., Cl. B ....    4,378,495      4,939,800
  215,000    United Technologies Corp. ............   10,259,579     13,635,300
                                                    ------------ --------------
             TOTAL INDUSTRIAL .....................  124,145,419    142,562,720
                                                    ------------ --------------
             INFORMATION TECHNOLOGY -- 19.7%
             COMMUNICATIONS EQUIPMENT -- 2.0%
  556,000    Cisco Systems Inc.+ ..................    8,830,648     10,858,680
   40,000    Harman International Industries Inc.      3,337,982      3,414,800
  161,000    QUALCOMM Inc. ........................    5,532,862      6,451,270
                                                    ------------ --------------
                                                      17,701,492     20,724,750
                                                    ------------ --------------
             COMPUTERS & PERIPHERAL -- 1.4%
  175,000    Apple Computer Inc.+ .................   12,172,946      9,996,000
  180,000    Dell Inc.+ ...........................    5,907,724      4,393,800
                                                    ------------ --------------
                                                      18,080,670     14,389,800
                                                    ------------ --------------
             SEMICONDUCTORS -- 2.9%
   95,000    Broadcom Corp., Cl. A+ ...............    3,116,131      2,854,750
  430,000    Intel Corp. ..........................   18,400,340      8,148,500
  260,000    Linear Technology Corp. ..............    9,615,113      8,707,400
  160,000    Microchip Technology Inc. ............    4,322,022      5,368,000
  146,000    Texas Instruments Inc. ...............    3,922,716      4,422,340
                                                    ------------ --------------
                                                      39,376,322     29,500,990
                                                    ------------ --------------
             SOFTWARE & SERVICES -- 13.1%
  205,000    Adobe Systems Inc.+ ..................    6,260,089      6,223,800
   65,000    CheckFree Corp.+ .....................    2,323,579      3,221,400
  420,000    eBay Inc.+ ...........................   16,591,931     12,301,800
   55,000    Electronic Arts Inc.+ ................    2,671,361      2,367,200
   50,000    FactSet Research Systems Inc. ........    2,174,561      2,365,000
  100,000    Getty Images Inc.+ ...................    7,573,822      6,351,000
   73,900    Google Inc., Cl. A+ ..................   20,936,952     30,988,487
  100,000    International Game Technology ........    3,077,224      3,794,000
1,560,000    Microsoft Corp. ......................   40,626,884     36,348,000
  105,000    NAVTEQ Corp.+ ........................    4,632,396      4,691,400
   70,000    SEI Investments Co. ..................    3,150,029      3,421,600
   60,000    Trimble Navigation Ltd.+ .............    2,740,072      2,678,400
  535,000    Yahoo! Inc.+ .........................   18,844,248     17,655,000
                                                    ------------ --------------
                                                     131,603,148    132,407,087
                                                    ------------ --------------
             TELECOMMUNICATIONS -- 0.3%
   89,900    NeuStar Inc., Cl. A+ .................    3,114,186      3,034,125
                                                    ------------ --------------
             TOTAL INFORMATION TECHNOLOGY .........  209,875,818    200,056,752
                                                    ------------ --------------

                 See accompanying notes to financial statements.

                                       5


THE GAMCO GROWTH FUND
SCHEDULE OF INVESTMENTS (CONTINUED) -- JUNE 30, 2006 (UNAUDITED)
- --------------------------------------------------------------------------------

                                                                      MARKET
   SHARES                                              COST           VALUE
   ------                                              ----           ------

             COMMON STOCKS (CONTINUED)
             MATERIALS -- 2.9%
   60,000    Allegheny Technologies Inc. .......... $  1,531,200 $    4,154,400
   95,000    BHP Billiton Ltd., ADR ...............    4,045,820      4,091,650
  183,000    Commercial Metals Co. ................    3,185,986      4,703,100
   55,000    Freeport-McMoRan Copper &
                Gold Inc., Cl. B ..................    2,295,054      3,047,550
   65,000    Newmont Mining Corp. .................    3,215,192      3,440,450
   60,000    Phelps Dodge Corp. ...................    5,145,272      4,929,600
   25,000    Rio Tinto plc, ADR ...................    4,301,022      5,242,750
                                                    ------------ --------------
             TOTAL MATERIALS ......................   23,719,546     29,609,500
                                                    ------------ --------------
             TOTAL COMMON STOCKS ..................  928,809,079    998,380,556
                                                    ------------ --------------
   PRINCIPAL
    AMOUNT
   -------
             U.S. GOVERNMENT OBLIGATIONS -- 1.8%
$17,922,000  U.S. Treasury Bills,
               4.502% to 4.923%++,
               07/06/06 to 10/12/06 ...............   17,807,674     17,810,571
                                                    ------------ --------------
             TOTAL
               INVESTMENTS -- 100.3% .............. $946,616,753  1,016,191,127
                                                    ============

             OTHER ASSETS AND LIABILITIES (NET) -- (0.3)% ......     (3,207,910)
                                                                 --------------
             NET ASSETS -- 100.0% .............................. $1,012,983,217
                                                                 ==============
- ----------------
 +    Non-income producing security.
 ++   Represents annualized yield at date of purchase.
 ADR  American Depository Receipt


                 See accompanying notes to financial statements.

                                       6


                              THE GAMCO GROWTH FUND

STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2006 (UNAUDITED)
- --------------------------------------------------------------------------------
ASSETS:
  Investments, at value (cost $946,616,753) ................. $1,016,191,127
  Cash ......................................................          1,140
  Receivable for investments sold ...........................     10,510,728
  Dividends receivable ......................................        765,432
  Receivable for Fund shares sold ...........................        295,750
  Other assets ..............................................         19,956
                                                              --------------
  TOTAL ASSETS ..............................................  1,027,784,133
                                                              --------------
LIABILITIES:
  Payable for investments purchased .........................     10,812,000
  Payable for Fund shares redeemed ..........................      1,679,826
  Payable for shareholder services fees .....................        851,543
  Payable for investment advisory fees ......................        827,436
  Payable for shareholder
    communications expenses .................................        335,165
  Payable for distribution fees .............................        207,287
  Payable for Trustees' fees ................................          1,666
  Other accrued expenses ....................................         85,993
                                                              --------------
  TOTAL LIABILITIES .........................................     14,800,916
                                                              --------------
  NET ASSETS applicable to 35,336,715
    shares outstanding ...................................... $1,012,983,217
                                                              ==============
NET ASSETS CONSIST OF:
  Shares of beneficial interest, each class at
    $0.01 par value ......................................... $      353,367
  Additional paid-in capital ................................  1,908,605,260
  Accumulated net investment loss ...........................       (699,007)
  Accumulated net realized loss on investments ..............   (964,850,777)
  Net unrealized appreciation on investments ................     69,574,374
                                                              --------------
  NET ASSETS ................................................ $1,012,983,217
                                                              ==============
SHARES OF BENEFICIAL INTEREST:
  CLASS AAA:
  Net Asset Value, offering and redemption price
    per share ($1,011,999,539 / 35,301,941
    shares outstanding; unlimited number
    of shares authorized) ...................................         $28.67
                                                                      ======
  CLASS A:
  Net Asset Value and redemption price per share
    ($280,407 / 9,778 shares outstanding;
    unlimited number of shares authorized) ..................         $28.68
                                                                      ======
  Maximum offering price per share (NAV / .9425,
    based on maximum sales charge of 5.75%
    of the offering price) ..................................         $30.43
                                                                      ======
  CLASS B:
  Net Asset  Value and offering price per share
    ($271,725 / 9,657.6 shares outstanding;
    unlimited number of shares authorized) ..................         $28.14(a)
                                                                      ======
  CLASS C:
  Net Asset Value and offering price per share
    ($431,546 / 15,338 shares outstanding;
    unlimited number of shares authorized) ..................         $28.14(a)
                                                                      ======
- --------------------
(a) Redemption price varies based on length of time held.



STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2006 (UNAUDITED)
- --------------------------------------------------------------------------------

INVESTMENT INCOME:
  Dividends (net of foreign taxes of $193,759) ..............   $  7,166,596
  Interest ..................................................        306,148
                                                                ------------
  TOTAL INVESTMENT INCOME ...................................      7,472,744
                                                                ------------
EXPENSES:
  Investment advisory fees ..................................      5,494,136
  Distribution fees - Class AAA .............................      1,372,326
  Distribution fees - Class A ...............................            355
  Distribution fees - Class B ...............................          1,385
  Distribution fees - Class C ...............................          2,300
  Shareholder services fees .................................        792,837
  Shareholder communications expenses .......................        264,202
  Custodian fees ............................................         75,508
  Legal and audit fees ......................................         39,289
  Trustees' fees ............................................         34,166
  Registration expenses .....................................         21,635
  Interest expense ..........................................            249
  Miscellaneous expenses ....................................         74,550
                                                                ------------
  TOTAL EXPENSES ............................................      8,172,938
  Less: Custodian fee credits ...............................         (1,187)
                                                                ------------
  TOTAL NET EXPENSES ........................................      8,171,751
                                                                ------------
  NET INVESTMENT LOSS .......................................       (699,007)
                                                                ------------
NET REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Net realized gain on investments ..........................     96,572,469
  Net change in unrealized appreciation/
    depreciation on investments .............................    (98,020,271)
                                                                ------------
  NET REALIZED AND UNREALIZED GAIN (LOSS)
    ON INVESTMENTS ..........................................     (1,447,802)
                                                                ------------
  NET DECREASE IN NET ASSETS RESULTING
    FROM OPERATIONS .........................................   $ (2,146,809)
                                                                ============

                 See accompanying notes to financial statements.

                                       7


                              THE GAMCO GROWTH FUND


STATEMENT OF CHANGES IN NET ASSETS
- ---------------------------------------------------------------------------------------------------------------------
                                                                              SIX MONTHS ENDED
                                                                               JUNE 30, 2006           YEAR ENDED
                                                                                 (UNAUDITED)        DECEMBER 31, 2005
                                                                               --------------       -----------------
                                                                                                 
OPERATIONS:
  Net investment loss ........................................................ $     (699,007)       $   (6,096,798)
  Net realized gain on investments ...........................................     96,572,469           117,060,872
  Net change in unrealized appreciation/depreciation on investments ..........    (98,020,271)            5,770,520
                                                                               --------------        --------------
  NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS ............     (2,146,809)          116,734,594
                                                                               --------------        --------------
SHARES OF BENEFICIAL INTEREST TRANSACTIONS:
  Class AAA ..................................................................   (125,502,379)         (424,688,588)
  Class A ....................................................................          8,263               192,347
  Class C ....................................................................       (121,969)              272,594
                                                                               --------------        --------------
  NET DECREASE IN NET ASSETS FROM SHARES OF
    BENEFICIAL INTEREST TRANSACTIONS .........................................   (125,616,085)         (424,223,647)
                                                                               --------------        --------------
  REDEMPTION FEES ............................................................          4,905                25,950
                                                                               --------------        --------------
  NET DECREASE IN NET ASSETS .................................................   (127,757,989)         (307,463,103)
NET ASSETS:
  Beginning of period ........................................................  1,140,741,206         1,448,204,309
                                                                               --------------        --------------
  End of period (including undistributed net investment income
    of $0 and $0, respectively) .............................................. $1,012,983,217        $1,140,741,206
                                                                               ==============        ==============


THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
- --------------------------------------------------------------------------------

1. ORGANIZATION. The GAMCO Growth Fund (the "Fund"), formerly The Gabelli Growth
Fund, was organized on October 24, 1986 as a Massachusetts  business trust.  The
Fund is a diversified  open-end  management  investment company registered under
the  Investment  Company Act of 1940,  as amended (the "1940  Act").  The Fund's
primary  objective  is  capital  appreciation.  The  Fund  commenced  investment
operations on April 10, 1987.

2. SIGNIFICANT  ACCOUNTING POLICIES.  The preparation of financial statements in
accordance with United States ("U.S.") generally accepted accounting  principles
requires  management to make estimates and assumptions  that affect the reported
amounts and disclosures in the financial statements. Actual results could differ
from those  estimates.  The  following  is a summary of  significant  accounting
policies followed by the Fund in the preparation of its financial statements.

SECURITY  VALUATION.  Portfolio  securities  listed or  traded  on a  nationally
recognized securities exchange or traded in the U.S. over-the-counter market for
which market quotations are readily available are valued at the last quoted sale
price or a market's  official  closing  price as of the close of business on the
day the  securities  are being  valued.  If there  were no sales  that day,  the
security is valued at the  average of the  closing  bid and asked  prices or, if
there were no asked  prices  quoted on that day,  then the security is valued at
the closing bid price on that day. If no bid or asked  prices are quoted on such
day,  the  security is valued at the most  recently  available  price or, if the
Board of Trustees (the "Board") so determines, by such other method as the Board
shall  determine  in good  faith to reflect  its fair  market  value.  Portfolio
securities  traded on more than one national  securities  exchange or market are
valued according to the broadest and most  representative  market, as determined
by Gabelli Funds, LLC (the "Adviser").

                                       8

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
- --------------------------------------------------------------------------------

Portfolio  securities  primarily traded on a foreign market are generally valued
at the preceding  closing values of such securities on the relevant market,  but
may be fair valued  pursuant to  procedures  established  by the Board if market
conditions change  significantly after the close of the foreign market but prior
to the  close of  business  on the day the  securities  are being  valued.  Debt
instruments  with  remaining  maturities  of 60 days or less that are not credit
impaired are valued at amortized cost,  unless the Board  determines such amount
does not reflect the securities' fair value, in which case these securities will
be fair valued as determined by the Board.  Debt  instruments  having a maturity
greater  than 60 days for which  market  quotations  are readily  available  are
valued at the average of the latest bid and asked prices. If there were no asked
prices  quoted on such day,  the security is valued using the closing bid price.
Futures contracts are valued at the closing  settlement price of the exchange or
board of trade on which the applicable contract is traded.

Securities and assets for which market  quotations are not readily available are
fair  valued as  determined  by the  Board.  Fair  valuation  methodologies  and
procedures may include, but are not limited to: analysis and review of available
financial and non-financial  information  about the company;  comparisons to the
valuation and changes in valuation of similar securities, including a comparison
of foreign  securities to the equivalent U.S. dollar value ADR securities at the
close of the U.S.  exchange;  and evaluation of any other information that could
be indicative of the value of the security.

FOREIGN  SECURITIES.  The Fund  may  directly  purchase  securities  of  foreign
issuers.  Investing in securities of foreign issuers  involves special risks not
typically  associated  with investing in securities of U.S.  issuers.  The risks
include  possible  revaluation of currencies,  the ability to repatriate  funds,
less complete financial information about companies, and possible future adverse
political  and  economic  developments.  Moreover,  securities  of many  foreign
issuers and their markets may be less liquid and their prices more volatile than
those of securities of comparable U.S. issuers.

FOREIGN  TAXES.  The Fund may be subject to  foreign  taxes on income,  gains on
investments,  or currency  repatriation,  a portion of which may be recoverable.
The Fund will accrue such taxes and  recoveries  as  applicable,  based upon its
current interpretation of tax rules and regulations that exist in the markets in
which it invests.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME.  Securities  transactions  are
accounted  for on the  trade  date  with  realized  gain or loss on  investments
determined  by using the  identified  cost method.  Interest  income  (including
amortization  of premium and  accretion  of discount) is recorded on the accrual
basis.  Premiums  and  discounts  on debt  securities  are  amortized  using the
effective  yield  to  maturity  method.  Dividend  income  is  recorded  on  the
ex-dividend date except for certain  dividends which are recorded as soon as the
Fund is informed of the dividend.

DETERMINATION   OF  NET  ASSET  VALUE  AND  CALCULATION  OF  EXPENSES.   Certain
administrative  expenses are common to, and allocated among,  various affiliated
funds.  Such allocations are made on the basis of each Fund's average net assets
or other criteria  directly  affecting the expenses as determined by the Adviser
pursuant to procedures established by the Board.

In calculating  the net asset value ("NAV") per share of each class,  investment
income, realized and unrealized gains and losses,  redemption fees, and expenses
other than class specific expenses,  are allocated daily to each class of shares
based upon the  proportion  of net assets of each class at the beginning of each
day. Distribution expenses are borne solely by the class incurring the expense.

                                       9

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
- --------------------------------------------------------------------------------

CUSTODIAN FEE CREDITS. When cash balances are maintained in the custody account,
the Fund receives  credits which are used to offset  custodian  fees.  The gross
expenses paid under the custody  arrangement  are included in custodian  fees in
the Statement of Operations with the corresponding expense offset, if any, shown
as "custodian fee credits".

DISTRIBUTIONS TO SHAREHOLDERS. Distributions to shareholders are recorded on the
ex-dividend date.  Distributions to shareholders are based on income and capital
gains as determined in accordance with Federal income tax regulations, which may
differ from income and capital gains as determined under U.S. generally accepted
accounting  principles.   These  differences  are  primarily  due  to  differing
treatments  of income and gains on  various  investment  securities  held by the
Fund, timing differences,  and differing characterizations of distributions made
by the Fund.  These book/tax  differences  are either  temporary or permanent in
nature. To the extent these  differences are permanent,  adjustments are made to
the appropriate capital accounts in the period when the differences arise. These
reclassifications  have no impact on the NAV of the Fund.  For the  fiscal  year
ended December 31, 2005, reclassifications were made to decrease accumulated net
investment  loss by  $6,096,798,  with an  offsetting  adjustment  to additional
paid-in capital.

No distributions were made in the fiscal year ended December 31, 2005.

PROVISION  FOR  INCOME  TAXES.  The Fund  intends  to  continue  to qualify as a
regulated  investment company under Subchapter M of the Internal Revenue Code of
1986, as amended (the  "Code").  It is the policy of the Fund to comply with the
requirements  of the Code  applicable to regulated  investment  companies and to
distribute  substantially  all of its net investment  company taxable income and
net capital gains. Therefore, no provision for Federal income taxes is required.

At December 31, 2005, the difference between book basis and tax basis unrealized
appreciation  was  primarily  due to  deferral of losses from wash sales for tax
purposes.

As of December 31, 2005, the components of  accumulated  earnings/(losses)  on a
tax basis were as follows:

    Accumulated capital loss carryforward ................  $(1,052,343,474)
    Net unrealized appreciation ..........................      158,514,873
                                                            ---------------
    Total ................................................  $  (893,828,601)
                                                            ===============

At December 31, 2005,  the Fund had net capital loss  carryforwards  for Federal
income tax purposes of  $1,052,343,474,  which are  available  to reduce  future
required  distributions  of net capital gains to  shareholders.  $701,151,305 is
available  through 2010;  $350,050,494 is available through 2011; and $1,141,675
is available  through  2012.  For the year ended  December  31,  2005,  the Fund
utilized capital loss carryforwards of $110,960,677.

The following  summarizes the tax cost of investments and the related unrealized
appreciation/depreciation at June 30, 2006:


                                                       GROSS            GROSS         NET UNREALIZED
                                                    UNREALIZED       UNREALIZED        APPRECIATION/
                                     COST          APPRECIATION     DEPRECIATION      (DEPRECIATION)
                                     ----          ------------     ------------      --------------
                                                                           
    Investments ............... $952,440,028      $120,844,173      $(57,093,074)      $63,751,099


                                       10

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
- --------------------------------------------------------------------------------

3.  INVESTMENT  ADVISORY  AGREEMENT.  The Fund has  entered  into an  investment
advisory  agreement (the "Advisory  Agreement")  with the Adviser which provides
that the Fund will pay the Adviser a fee,  computed  daily and paid monthly,  at
the  annual  rate of 1.00% of the  value of its  average  daily net  assets.  In
accordance  with the  Advisory  Agreement,  the  Adviser  provides a  continuous
investment program for the Fund's portfolio,  oversees the administration of all
aspects of the Fund's  business and affairs,  and pays the  compensation  of all
Officers and Trustees of the Fund who are affiliated persons of the Adviser.

4.  DISTRIBUTION  PLAN.  The Fund's Board has adopted a  distribution  plan (the
"Plan")  for each class of shares  pursuant  to Rule  12b-1  under the 1940 Act.
Gabelli & Company,  Inc.  ("Gabelli &  Company"),  an  affiliate of the Adviser,
serves as  distributor  of the Fund.  Under the Class AAA, Class A, Class B, and
Class C Share  Plans,  payments  are  authorized  to Gabelli & Company at annual
rates of 0.25%, 0.25%, 1.00%, and 1.00%, respectively,  of the average daily net
assets of those classes,  the annual  limitations under each Plan. Such payments
are accrued daily and paid monthly.

5. PORTFOLIO SECURITIES. Purchases and proceeds from the sales of securities for
the six months ended June 30, 2006, other than short-term securities, aggregated
$258,470,990 and $388,835,385, respectively.

6. TRANSACTIONS WITH AFFILIATES.  During the six months ended June 30, 2006, the
Fund paid brokerage  commissions of $19,561 to Gabelli & Company.  Additionally,
Gabelli  &  Company  informed  the Fund that it  received  $407  from  investors
representing  commissions  (sales  charges and  underwriting  fees) on sales and
redemptions of Fund shares.

The cost of calculating  the Fund's NAV per share is a Fund expense  pursuant to
the Advisory  Agreement between the Fund and the Adviser.  During the six months
ended  June 30,  2006,  the Fund  paid or  accrued  $22,500  to the  Adviser  in
connection  with the cost of  computing  the Fund's  NAV,  which is  included in
miscellaneous expenses in the Statement of Operations.

7. LINE OF CREDIT.  The Fund has access to an unsecured  line of credit of up to
$25,000,000  from the  custodian for temporary  borrowing  purposes.  Borrowings
under this  arrangement  bear  interest at 0.75% above the Federal Funds rate on
outstanding  balances.  During the six months ended June 30, 2006, there were no
borrowings from the line of credit.

8. SHARES OF  BENEFICIAL  INTEREST.  The Fund  currently  offers four classes of
shares -- Class AAA Shares,  Class A Shares, Class B Shares, and Class C Shares.
Class AAA Shares are offered only to investors  who acquire them  directly  from
Gabelli & Company,  or through  selected  broker/dealers,  or the transfer agent
without a sales charge.  Class A Shares are subject to a maximum front-end sales
charge of 5.75%.  Class B Shares are  subject  to a  contingent  deferred  sales
charge ("CDSC") upon redemption  within six years of purchase and  automatically
convert to Class A Shares approximately eight years after the original purchase.
The applicable CDSC is equal to a declining  percentage of the lesser of the NAV
per share at the date of the  original  purchase  or at the date of  redemption,
based on the  length of time held.  Class C Shares are  subject to a 1% CDSC for
one year after purchase.  Class B Shares are available only through  exchange of
Class B Shares of other funds  distributed  by Gabelli & Company.  The Board has
approved Class I Shares which have not been offered publicly.

Effective June 15, 2005, the Fund imposed a redemption fee of 2.00% on Class AAA
Shares,  Class A Shares, Class B Shares, and Class C Shares that are redeemed or
exchanged  on or before the seventh day after the date of a purchase.  (Prior to
June 15, 2005, the Fund imposed a redemption fee on shares that were redeemed or
exchanged  on or before  the  sixtieth  day after the date of a  purchase.)  The
redemption fee is deducted from the proceeds  otherwise payable to the redeeming
shareholders  and is retained by the Fund. The  redemption  fees retained by the
Fund  during  the six  months  ended  June 30,  2006 and the  fiscal  year ended
December 31, 2005 amounted to $4,905 and $25,950, respectively.

                                       11

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
- --------------------------------------------------------------------------------

The redemption fee does not apply to shares purchased  through programs that the
Adviser  determined to have  appropriate  short-term  trading policies in place.
Additionally,  certain recordkeepers for qualified and non-qualified  retirement
plans that could not collect the redemption fee at the participant  level due to
systems limitations have received an extension to implement such systems.

Transactions in shares of beneficial interest were as follows:



                                                           SIX MONTHS ENDED
                                                             JUNE 30, 2006                      YEAR ENDED
                                                              (UNAUDITED)                    DECEMBER 31, 2005
                                                     ---------------------------       ----------------------------
                                                       SHARES          AMOUNT             SHARES         AMOUNT
                                                     ---------------------------       ----------------------------
                                                               CLASS AAA                         CLASS AAA
                                                     ---------------------------       ----------------------------
                                                                                          
Shares sold ......................................    1,354,934    $  39,969,021         4,243,927    $ 113,064,508
Shares redeemed ..................................   (5,616,270)    (165,471,400)      (20,096,781)    (537,753,096)
                                                     ----------    -------------       -----------    -------------
  Net decrease ...................................   (4,261,336)   $(125,502,379)      (15,852,854)   $(424,688,588)
                                                     ==========    ============-       ===========    =============
                                                                CLASS A                           CLASS A
                                                     ---------------------------       ----------------------------
Shares sold ......................................        1,145    $      33,273             7,311    $     208,331
Shares redeemed ..................................         (870)         (25,010)             (594)         (15,984)
                                                     ----------    -------------       -----------    -------------
  Net increase ...................................          275    $       8,263             6,717    $     192,347
                                                     ==========    ============-       ===========    =============
                                                                CLASS C                           CLASS C
                                                     ---------------------------       ----------------------------
Shares sold ......................................        1,916    $      54,400            14,494    $     373,629
Shares redeemed ..................................       (6,057)        (176,369)           (3,750)        (101,035)
                                                     ----------    -------------       -----------    -------------
  Net increase (decrease) ........................       (4,141)   $    (121,969)           10,744    $     272,594
                                                     ==========    ============-       ===========    =============


9.  INDEMNIFICATIONS.  The Fund enters into  contracts that contain a variety of
indemnifications.  The Fund's  maximum  exposure  under  these  arrangements  is
unknown.  However, the Fund has not had prior claims or losses pursuant to these
contracts and expects the risk of loss to be remote.

10. OTHER MATTERS.  The Adviser and/or  affiliates have received  subpoenas from
the Attorney General of the State of New York and the SEC requesting information
on mutual fund trading practices involving certain funds managed by the Adviser.
GAMCO Investors,  Inc. ("GAMCO"), the Adviser's parent company, is responding to
these  requests  for  documents  and  testimony.   In  June  2006,  GAMCO  began
discussions with the SEC regarding a possible resolution of their inquiry. Since
these discussions are ongoing, it cannot be determined at this time whether they
will ultimately  result in a settlement of this matter. On a separate matter, in
September  2005, the Adviser was informed by the staff of the SEC that the staff
may recommend to the  Commission  that an  administrative  remedy and a monetary
penalty be sought  from the  Adviser in  connection  with the  actions of two of
seven closed-end funds managed by the Adviser relating to Section 19(a) and Rule
19a-1 of the 1940 Act. These provisions require registered  investment companies
to provide  written  statements to  shareholders  when a dividend is made from a
source other than net investment  income.  While the two  closed-end  funds sent
annual statements and provided other materials containing this information,  the
funds did not send written  statements to shareholders with each distribution in
2002 and 2003. The Adviser believes that all of the funds are now in compliance.
The Adviser  believes that these matters would have no effect on the Fund or any
material adverse effect on the Adviser or its ability to manage the Fund.

                                       12


THE GAMCO GROWTH FUND
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

Selected data for a share of beneficial  interest  outstanding  throughout  each
period:



                                             INCOME
                                     FROM INVESTMENT OPERATIONS                  DISTRIBUTIONS
                             -----------------------------------------    --------------------------
                                               Net
                 Net Asset                 Realized and       Total           Net
    Period        Value,         Net        Unrealized        from         Realized
    Ended        Beginning    Investment  Gain/(Loss) on    Investment      Gain on        Total
  December 31   of Period       Loss(a)     Investments     Operations    Investments   Distributions
  -----------   ---------       -------     -----------     ----------    -----------   -------------
                                                                         
CLASS AAA
   2006(b)        $28.81       $(0.02)       $(0.12)         $(0.14)          --             --
   2005            26.12        (0.13)         2.82            2.69           --             --
   2004            24.95        (0.11)         1.28            1.17           --             --
   2003            18.99        (0.14)         6.10            5.96           --             --
   2002            28.68        (0.17)        (9.52)          (9.69)          --             --
   2001            37.79        (0.23)        (8.88)          (9.11)      $(0.00)(c)     $(0.00)(c)
CLASS A
   2006(b)        $28.82       $(0.02)       $(0.12)         $(0.14)          --             --
   2005            26.13        (0.12)         2.81            2.69           --             --
   2004(e)         24.95        (0.02)         1.20            1.18           --             --
CLASS B
   2006(b)        $28.38       $(0.13)       $(0.11)         $(0.24)          --             --
   2005            25.93        (0.32)         2.77            2.45           --             --
   2004(e)         24.95        (0.28)         1.26            0.98           --             --
CLASS C
   2006(b)        $28.38       $(0.13)       $(0.11)         $(0.24)          --             --
   2005            25.93        (0.32)         2.77            2.45           --             --
   2004(e)         24.95        (0.21)         1.19            0.98           --             --





                                                      RATIOS TO AVERAGE NET ASSETS/SUPPLEMENTAL DATA
                                              -------------------------------------------------------------

                               Net Asset                    Net Assets
   Period                        Value,                       End of         Net                  Portfolio
    Ended       Redemption       End of          Total        Period     Investment   Operating   Turnover
  December 31     Fees(a)        Period         Return+     (in 000's)      Loss       Expenses     Rate
  -----------     -------        ------         -------     ----------      ----       --------     ----
                                                                                
CLASS AAA
   2006(b)       $0.00(c)        $28.67          (0.5)%     $1,012,000     (0.13)%(d)    1.49%(d)    24%
   2005           0.00(c)         28.81          10.3        1,139,640     (0.48)        1.49        39
   2004           0.00(c)         26.12           4.7        1,447,655     (0.46)        1.53        31
   2003             --            24.95          31.4        1,881,457     (0.60)        1.47        42
   2002             --            18.99         (33.8)       1,675,816     (0.68)        1.43        30
   2001             --            28.68         (24.1)       2,948,390     (0.71)        1.40        26
CLASS A
   2006(b)       $0.00(c)        $28.68          (0.5)%     $      280     (0.12)%(d)    1.49%(d)    24%
   2005           0.00(c)         28.82          10.3              274     (0.43)        1.47        39
   2004(e)        0.00(c)         26.13           4.7               73     (0.09)        1.60        31
CLASS B
   2006(b)       $0.00(c)        $28.14          (0.9)%     $      272     (0.87)%(d)    2.24%(d)    24%
   2005           0.00(c)         28.38           9.5              274     (1.22)        2.24        39
   2004(e)        0.00(c)         25.93           3.9              250     (1.12)        2.30        31
CLASS C
   2006(b)       $0.00(c)        $28.14          (0.9)%     $      431     (0.90)%(d)    2.24%(d)    24%
   2005           0.00(c)         28.38           9.5              553     (1.21)        2.23        39
   2004(e)        0.00(c)         25.93           3.9              226     (0.88)        2.37        31

- ---------------------------
+   Total return  represents  aggregate  total return of a  hypothetical  $1,000
    investment  at the beginning of the period and sold at the end of the period
    including  reinvestment  of  distributions  and does not reflect  applicable
    sales  charges.  Total  return  for the  period of less than one year is not
    annualized.
(a) Per share amounts have been calculated using  the average shares outstanding
    method.
(b) For the six months ended June 30, 2006, unaudited.
(c) Amount represents less than $0.005 per share.
(d) Annualized.
(e) Class A, Class B, and Class C Shares were initially offered on December 31,
    2003.

                 See accompanying notes to financial statements.

                                       13


                              THE GAMCO GROWTH FUND

BOARD CONSIDERATION AND RE-APPROVAL OF INVESTMENT ADVISORY AGREEMENT (UNAUDITED)

At its meeting on February 15, 2006, the Board of Trustees ("Board") of the Fund
approved the continuation of the investment  advisory agreement with the Adviser
for the Fund on the  basis of the  recommendation  by the  trustees  who are not
"interested  persons"  of  the  Fund  (the  "independent  board  members").  The
following  paragraphs  summarize the material information and factors considered
by the independent board members as well as their  conclusions  relative to such
factors.

NATURE, EXTENT AND QUALITY OF SERVICES. The independent board members considered
information  regarding  the  portfolio  manager,  the depth of the analyst  pool
available to the Adviser and the portfolio manager, the scope of administrative,
shareholder,  and other services supervised or provided by the Adviser,  and the
absence of significant  service problems  reported to the Board. The independent
board members noted the  experience,  length of service,  and  reputation of the
portfolio manager.

INVESTMENT  PERFORMANCE.  The  independent  board  members  reviewed  the short,
medium, and long-term  performance of the Fund against a peer group of large-cap
growth funds chosen by Lipper as being comparable. The independent board members
noted  that the  Fund's  performance  was  near the top 25% of the  funds in its
category  for the one and ten year  periods  and the top 50% for the prior three
year period,  but was in or near the lowest 25% of the funds in its category for
the five year period. The independent board members also discussed at length the
performance for the five year period and changes made to the Fund's portfolio to
seek to prevent a recurrence of the Fund's performance in 2002.

PROFITABILITY. The independent board members reviewed summary data regarding the
profitability  of the Fund to the Adviser both with an  administrative  overhead
charge and without such a charge.  The independent board members also noted that
the Adviser's affiliated broker received  distribution fees and minor amounts of
sales commissions.

ECONOMIES OF SCALE. The independent  board members  discussed the major elements
of the  Adviser's  cost  structure  and the  relationship  of those  elements to
potential economies of scale.

SHARING OF ECONOMIES OF SCALE.  The  independent  board  members  noted that the
investment  advisory  fee  schedule  for the Fund does not take into account any
potential  economies  of scale  that may  develop  or any  losses or  diminished
profitability to the Adviser in prior years.

SERVICE AND COST COMPARISONS. The independent board members compared the expense
ratios of the investment advisory fee, other expenses, and total expenses of the
Fund to similar  expense ratios of the peer group of large-cap  growth funds and
noted that the advisory fee includes  substantially all administrative  services
of the  Fund  as  well as  investment  advisory  services  of the  Adviser.  The
independent  board members noted that the Fund's  expense  ratios were above and
the Fund's  size was above  average  within this group.  The  independent  board
members  also  noted that the  advisory  fee  structure  was the same as that in
effect  for most of the  Gabelli  funds.  The  independent  board  members  were
presented with, but did not consider to be material to their  decision,  various
information  comparing  the  advisory fee to the fee for other types of accounts
managed by affiliates of the Adviser.

CONCLUSIONS.  The  independent  board  members  concluded  that the Fund enjoyed
highly experienced portfolio management services and good ancillary services but
that the five year performance  record was poor and that the expense ratios were
significantly higher than those of the peer group. The independent board members
also noted that the longer and  shorter-term  performance  was excellent or very
good and that steps had been taken to seek to avoid the problems that led to the
poor five year performance. They concluded that the positive trend and long-term
record of the portfolio  manager were  sufficient in relation to the performance
factor to warrant renewal of the investment advisory agreement at this time. The
independent  board members  concluded that the  profitability  to the Adviser of
managing  the  Fund  was  reasonable  and that  economies  of  scale  were not a
significant factor in their thinking at this time. The independent board members
did not view the potential  profitability  of ancillary  services as material to
their decision.  On the basis of the foregoing and without assigning  particular
weight to any single  conclusion,  the independent  board members  determined to
recommend continuation of the investment advisory agreement to the full Board.

                                       14


                             GABELLI FAMILY OF FUNDS

VALUE _______________________________________
GABELLI ASSET FUND
Seeks to invest primarily in a diversified portfolio of common stocks selling at
significant  discounts  to  their  private  market  value.  The  Fund's  primary
objective is growth of capital. (MULTICLASS)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI BLUE CHIP VALUE FUND
Seeks long term growth of capital  through  investment  primarily  in the common
stocks of established  companies which are temporarily out of favor.  The fund's
objective  is to  identify a catalyst or sequence of events that will return the
company to a higher value.
(MULTICLASS)                              PORTFOLIO MANAGER: BARBARA MARCIN, CFA

WESTWOOD EQUITY FUND
Seeks to invest  primarily in the common stock of  well-seasoned  companies that
have  recently  reported  positive  earnings  surprises  and are  trading  below
Westwood's  proprietary  growth rate estimates.  The Fund's primary objective is
capital appreciation.
(MULTICLASS)                                   PORTFOLIO MANAGER: SUSAN M. BYRNE

FOCUSED VALUE _______________________________
GABELLI VALUE FUND
Seeks to invest in  securities  of  companies  believed to be  undervalued.  The
Fund's primary objective is long-term capital appreciation. (MULTICLASS)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

SMALL CAP VALUE _____________________________
GABELLI SMALL CAP FUND
Seeks  to  invest  primarily  in  common  stock  of  smaller  companies  (market
capitalizations  less  than $1  billion)  believed  to have  rapid  revenue  and
earnings growth potential. The Fund's primary objective is capital appreciation.
(MULTICLASS)                            PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

WESTWOOD SMALLCAP EQUITY FUND
Seeks to invest primarily in smaller  capitalization  equity securities - market
caps of $2.5 billion or less. The Fund's primary  objective is long-term capital
appreciation. (MULTICLASS)                                          TEAM MANAGED

GABELLI WOODLAND SMALL CAP VALUE FUND
Seeks to invest  primarily  in the common  stocks of smaller  companies  (market
capitalizations  less  than  $1.5  billion)  believed  to  be  undervalued  with
shareholder  oriented management teams that are employing strategies to grow the
company's  value.  The  Fund's  primary   objective  is  capital   appreciation.
(MULTICLASS)                          PORTFOLIO MANAGER: ELIZABETH M. LILLY, CFA

GROWTH ______________________________________
GAMCO GROWTH FUND
Seeks to invest  primarily in large cap stocks believed to have  favorable,  yet
undervalued,  prospects for earnings  growth.  The Fund's  primary  objective is
capital appreciation. (MULTICLASS)        PORTFOLIO MANAGER: HOWARD F. WARD, CFA

GAMCO INTERNATIONAL GROWTH FUND
Seeks to invest in the equity  securities  of  foreign  issuers  with  long-term
capital   appreciation    potential.    The   Fund   offers   investors   global
diversification. (MULTICLASS)                    PORTFOLIO MANAGER: CAESAR BRYAN

AGGRESSIVE GROWTH ___________________________
GAMCO GLOBAL GROWTH FUND
Seeks capital appreciation through a disciplined  investment program focusing on
the globalization and interactivity of the world's marketplace. The Fund invests
in  companies  at the  forefront  of  accelerated  growth.  The  Fund's  primary
objective is capital appreciation. (MULTICLASS)                     TEAM MANAGED

MICRO-CAP ___________________________________
WESTWOOD MIGHTY MITES(SM) FUND
Seeks to invest in micro-cap companies that have market  capitalizations of $300
million or less. The Fund's primary objective is long-term capital appreciation.
(MULTICLASS)                                                        TEAM MANAGED

EQUITY INCOME _______________________________
GABELLI EQUITY INCOME FUND
Seeks to invest primarily in equity securities with above market average yields.
The Fund pays monthly  dividends  and seeks a high level of total return with an
emphasis on income. (MULTICLASS)        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

WESTWOOD BALANCED FUND
Seeks to invest in a balanced and diversified portfolio of stocks and bonds. The
Fund's primary objective is both capital appreciation and current income.
(MULTICLASS)                            CO-PORTFOLIO MANAGERS: SUSAN M. BYRNE
                                                               MARK FREEMAN, CFA

WESTWOOD INCOME FUND
Seeks to  provide   a high level of  current income as well as long-term capital
appreciation  by  investing  in   income   producing  equity  and  fixed  income
securities. (MULTICLASS)                                            TEAM MANAGED

SPECIALTY EQUITY ____________________________
GAMCO GLOBAL CONVERTIBLE SECURITIES FUND
Seeks to invest  principally in bonds and preferred stocks which are convertible
into  common  stock of  foreign  and  domestic  companies.  The  Fund's  primary
objective is total return  through a combination  of current  income and capital
appreciation. (MULTICLASS)                                          TEAM MANAGED

GAMCO GLOBAL OPPORTUNITY FUND
Seeks to invest in common stock of companies which have rapid growth in revenues
and  earnings  and  potential  for above  average  capital  appreciation  or are
undervalued. The Fund's primary objective is capital appreciation.
(MULTICLASS)                                                        TEAM MANAGED

SECTOR ______________________________________
GAMCO GLOBAL TELECOMMUNICATIONS FUND
Seeks to invest in telecommunications companies throughout the world - targeting
undervalued  companies with strong  earnings and cash flow dynamics.  The Fund's
primary objective is capital appreciation. (MULTICLASS)             TEAM MANAGED

GAMCO GOLD FUND
Seeks to invest in a global  portfolio of equity  securities  of gold mining and
related  companies.  The Fund's  objective  is long-term  capital  appreciation.
Investment in gold stocks is considered speculative and is affected by a variety
of world-wide economic, financial, and political factors. (MULTICLASS)
                                                 PORTFOLIO MANAGER: CAESAR BRYAN

GABELLI UTILITIES FUND
Seeks to provide a high level of total return  through a combination  of capital
appreciation and current income. (MULTICLASS)                       TEAM MANAGED

MERGER AND ARBITRAGE ________________________
GABELLI ABC FUND
Seeks to invest in securities with attractive  opportunities for appreciation or
investment  income.  The Fund's  primary  objective  is total  return in various
market conditions without excessive risk of capital loss.
(NO-LOAD)                               PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

CONTRARIAN___________________________________
GAMCO MATHERS FUND
Seeks  long-term  capital  appreciation  in various  market  conditions  without
excessive risk of capital loss. (CLASS AAA-NO-LOAD)
                                        PORTFOLIO MANAGER: HENRY VAN DER EB, CFA

COMSTOCK CAPITAL VALUE FUND
Seeks capital  appreciation and current income.  The Fund may use either long or
short positions to achieve its objective.
(MULTICLASS)                               PORTFOLIO MANAGER: MARTIN WEINER, CFA

COMSTOCK STRATEGY FUND
The Fund emphasizes investments in debt securities,  which maximize total return
in light of credit risk,  interest rate risk, and the risk  associated  with the
length of maturity of debt instruments. (MULTICLASS)
                                           PORTFOLIO MANAGER: MARTIN WEINER, CFA

FIXED INCOME ________________________________
WESTWOOD INTERMEDIATE BOND FUND
Seeks to invest in a diversified portfolio of bonds with various maturities. The
Fund's primary objective is total return.
(MULTICLASS)                                PORTFOLIO MANAGER: MARK FREEMAN, CFA

CASH MANAGEMENT-MONEY MARKET ________________
GABELLI U.S. TREASURY MONEY MARKET FUND
Seeks to invest exclusively in short-term U.S. Treasury  securities.  The Fund's
primary  objective  is to  provide  high  current  income  consistent  with  the
preservation of principal and liquidity. (NO-LOAD)
                                             PORTFOLIO MANAGER: JUDITH A. RANERI

AN INVESTMENT IN THE ABOVE MONEY MARKET FUND  IS NEITHER  INSURED NOR GUARANTEED
BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY GOVERNMENT AGENCY.  ALTHOUGH
THE FUND SEEKS TO PRESERVE THE VALUE OF YOUR  INVESTMENT AT $1.00 PER SHARE,  IT
IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND.

THE  FUNDS MAY  INVEST IN  FOREIGN SECURITIES WHICH INVOLVE RISKS NOT ORDINARILY
ASSOCIATED WITH INVESTMENTS IN DOMESTIC ISSUES,  INCLUDING CURRENCY FLUCTUATION,
ECONOMIC, AND POLITICAL RISKS.

TO RECEIVE A PROSPECTUS, CALL 800-GABELLI (422-3554). INVESTORS SHOULD CAREFULLY
  CONSIDER THE INVESTMENT OBJECTIVES, RISKS, CHARGES, AND EXPENSES OF THE FUND
           BEFORE INVESTING. THE PROSPECTUS CONTAINS MORE INFORMATION
   ABOUT THIS AND OTHER MATTERS AND SHOULD BE READ CAREFULLY BEFORE INVESTING.



                              THE GAMCO GROWTH FUND
                              One Corporate Center
                            Rye, New York 10580-1422
                                   800-GABELLI
                                  800-422-3554
                                FAX: 914-921-5118
                            WEBSITE: WWW.GABELLI.COM
                            E-MAIL: INFO@GABELLI.COM
                   Net Asset Value available daily by calling
                           800-GABELLI after 6:00 P.M.

                                BOARD OF TRUSTEES
Mario J. Gabelli, CFA                   Robert J. Morrissey
CHAIRMAN AND CHIEF                      ATTORNEY-AT-LAW
EXECUTIVE OFFICER                       MORRISSEY, HAWKINS & LYNCH
GAMCO INVESTORS, INC.

Anthony J. Colavita                     Anthony R. Pustorino
ATTORNEY-AT-LAW                         CERTIFIED PUBLIC ACCOUNTANT,
ANTHONY J. COLAVITA, P.C.               PROFESSOR EMERITUS
                                        PACE UNIVERSITY

James P. Conn                           Anthony Torna
FORMER CHIEF INVESTMENT OFFICER         MAXIM GROUP LLC
FINANCIAL SECURITY ASSURANCE
HOLDINGS LTD.

Dugald A. Fletcher                      Anthonie C. van Ekris
PRESIDENT                               CHAIRMAN
FLETCHER & COMPANY, INC.                BALMAC INTERNATIONAL, INC.

John D. Gabelli                         Salvatore J. Zizza
SENIOR VICE PRESIDENT                   CHAIRMAN, HALLMARK ELECTRICAL
GABELLI & COMPANY, INC.                 SUPPLIES CORP.

                         OFFICERS AND PORTFOLIO MANAGER
Bruce N. Alpert                         Howard F. Ward, CFA
PRESIDENT                               PORTFOLIO MANAGER

James E. McKee                          Peter D. Goldstein
SECRETARY                               CHIEF COMPLIANCE OFFICER

Agnes Mullady
TREASURER

                                   DISTRIBUTOR
                             Gabelli & Company, Inc.

                  CUSTODIAN, TRANSFER AGENT, AND DIVIDEND AGENT
                       State Street Bank and Trust Company

                                  LEGAL COUNSEL
                    Skadden, Arps, Slate, Meagher & Flom LLP

- --------------------------------------------------------------------------------
This report is submitted for the general  information of the shareholders of The
GAMCO  Growth  Fund.  It is  not  authorized  for  distribution  to  prospective
investors unless preceded or accompanied by an effective prospectus.
- --------------------------------------------------------------------------------
GAB406Q206SR




                                                                           GAMCO





                                                THE
                                                GAMCO
                                                GROWTH
                                                FUND






                                                              SEMI-ANNUAL REPORT
                                                                   JUNE 30, 2006


ITEM 2. CODE OF ETHICS.

Not applicable.



ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

Not applicable.



ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Not applicable.



ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS.

Not applicable.



ITEM 6. SCHEDULE OF INVESTMENTS.

Schedule of Investments in securities of unaffiliated issuers as of the close of
the  reporting  period is included as part of the report to  shareholders  filed
under Item 1 of this form.



ITEM 7.  DISCLOSURE  OF PROXY VOTING  POLICIES  AND  PROCEDURES  FOR  CLOSED-END
         MANAGEMENT INVESTMENT COMPANIES.

Not applicable.



ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable.




ITEM 9.  PURCHASES OF EQUITY  SECURITIES  BY  CLOSED-END  MANAGEMENT  INVESTMENT
         COMPANY AND AFFILIATED PURCHASERS.

Not applicable.



ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

There have been no material  changes to the procedures by which the shareholders
may  recommend  nominees  to the  registrant's  Board of  Trustees,  where those
changes were  implemented  after the  registrant  last  provided  disclosure  in
response to the  requirements  of Item  7(d)(2)(ii)(G)  of Schedule  14A (17 CFR
240.14a-101), or this Item.


ITEM 11. CONTROLS AND PROCEDURES.

     (a)  The registrant's principal executive and principal financial officers,
          or persons  performing  similar  functions,  have  concluded  that the
          registrant's  disclosure  controls and  procedures (as defined in Rule
          30a-3(c)  under the  Investment  Company Act of 1940,  as amended (the
          "1940 Act") (17 CFR 270.30a-3(c))) are effective,  as of a date within
          90 days of the filing date of the report that includes the  disclosure
          required  by this  paragraph,  based  on  their  evaluation  of  these
          controls and  procedures  required by Rule 30a-3(b) under the 1940 Act
          (17 CFR  270.30a-3(b))  and Rules  13a-15(b)  or  15d-15(b)  under the
          Securities  Exchange Act of 1934, as amended (17 CFR  240.13a-15(b) or
          240.15d-15(b)).


     (b)  There  were no  changes  in the  registrant's  internal  control  over
          financial  reporting (as defined in Rule  30a-3(d)  under the 1940 Act
          (17 CFR  270.30a-3(d))  that occurred during the  registrant's  second
          fiscal  quarter  of  the  period  covered  by  this  report  that  has
          materially affected, or is reasonably likely to materially affect, the
          registrant's internal control over financial reporting.


ITEM 12. EXHIBITS.

     (a)(1)   Not applicable.

     (a)(2)  Certifications  pursuant  to Rule  30a-2(a)  under the 1940 Act and
             Section 302 of the Sarbanes-Oxley Act of 2002 are attached hereto.

     (a)(3)   Not applicable.

     (b)      Certifications  pursuant to Rule  30a-2(b)  under the 1940 Act and
              Section 906 of the Sarbanes-Oxley Act of 2002 are attached hereto.







                                   SIGNATURES

Pursuant to the  requirements  of the  Securities  Exchange  Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

(registrant)     The GAMCO Growth Fund
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By (Signature and Title)*  /s/ Bruce N. Alpert
                         -------------------------------------------------------
                           Bruce N. Alpert, Principal Executive Officer

Date     September 1, 2006
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Pursuant to the  requirements  of the  Securities  Exchange  Act of 1934 and the
Investment  Company  Act of  1940,  this  report  has been  signed  below by the
following  persons on behalf of the  registrant and in the capacities and on the
dates indicated.


By (Signature and Title)*  /s/ Bruce N. Alpert
                         -------------------------------------------------------
                           Bruce N. Alpert, Principal Executive Officer


Date     September 1, 2006
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By (Signature and Title)*  /s/ Agnes Mullady
                         -------------------------------------------------------
                           Agnes Mullady, Principal Financial Officer
                           & Treasurer


Date     September 1, 2006
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* Print the name and title of each signing officer under his or her signature.