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 811-01311
                                                    ----------

                            The Gabelli Mathers 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: December 31, 2004
                                            ------------------


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,  450 Fifth Street, NW,
Washington,  DC 20549-0609.  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.
                                                               [GRAPHIC OMITTED]
THE
GABELLI
MATHERS
FUND
                                                                   ANNUAL REPORT
                                                               DECEMBER 31, 2004



                            THE GABELLI MATHERS FUND
                                  ANNUAL REPORT
                                DECEMBER 31, 2004



TO OUR SHAREHOLDERS,

      The Sarbanes-Oxley Act requires a Fund's principal executive and financial
officers  to  certify  the  entire   contents  of  the  semi-annual  and  annual
shareholder  reports in a filing with the Securities and Exchange  Commission on
Form N-CSR. This certification  would cover the portfolio  manager's  commentary
and  subjective  opinions  if they are  attached  to or a part of the  financial
statements. Many of these comments and opinions would be difficult or impossible
to certify.

      Because we do not want our portfolio  managers to eliminate their opinions
and/or  restrict their  commentary to historical  facts, we have separated their
commentary from the financial  statements and investment portfolio and have sent
it to  you  separately.  Both  the  commentary  and  the  financial  statements,
including  the  portfolio  of  investments,  will be available on our website at
www.gabelli.com/funds.

      Enclosed are the audited financial statements and the investment portfolio
as of December  31, 2004 with a  description  of the factors  that  affected the
performance during the past year.

                                          Sincerely yours,



                                          /s/ Bruce N. Alpert
                                          Bruce N. Alpert
                                          Executive Vice President
February 23, 2005


PERFORMANCE DISCUSSION
The Fund's portfolio remained  conservatively invested at year end, with a gross
stock  exposure of 22.4% of assets,  comprised of 10.7% longs and 11.7%  shorts,
with the remainder in cash, awaiting lower risk entry points to initiate new and
larger  capital  commitments.  This compares to a 10.3% gross stock  exposure at
year-end 2003, comprised of 6.4% long and 3.9% short individual securities. Both
the long stock segment of the portfolio and the fixed income portion,  which was
limited to  short-term  U.S.  Treasury  bills and U.S.  Treasury  collateralized
repurchase  agreements,  added to the  Fund's  total  return in 2004.  The short
equity  segment  had a negative  return and was the primary  factor,  along with
negative real short-term interest rates, for the Fund's 2004 performance.

During the year, a portion of the Fund's  common  stock  segment was invested in
takeover-target  companies subject to friendly, all cash tender or merger offers
from acquiring companies. The Fund purchased these event-driven stocks after the
deals were  publicly  announced,  generally  by  financially  strong,  strategic
buyers.  Deal arbitrage stocks typically earn relatively  attractive  annualized
returns,  but are held for short time periods resulting in a  disproportionately
high  portfolio  turnover rate,  which can be  misleading.  This occurs when the
Fund's fixed income position is a relatively high proportion of assets and has a
maturity of less than one year, while the percent invested in stocks is low.


        GROWTH OF $10,000 INVESTMENT IN GABELLI MATHERS FUND (Log Scale)

[GRAPHIC OMITTED]
PLOT POINTS FOLLOW:

                    Gabelli Mathers Fund                      S&P 500 Index
65                                10,000                             10,000
                                  10,585                             10,389
                                  12,122                             10,768
66                                13,090                             10,473
                                  12,738                             10,028
                                  11,164                              9,141
                                  12,632                              9,685
67                                17,013                             10,964
                                  19,767                             11,104
                                  22,744                             11,937
                                  24,332                             12,007
68                                20,818                             11,319
                                  26,189                             12,592
                                  29,709                             13,080
                                  30,868                             13,335
69                                31,932                             13,134
                                  29,260                             12,739
                                  28,771                             12,239
                                  29,016                             12,200
70                                28,163                             11,990
                                  21,699                              9,828
                                  24,698                             11,490
                                  29,588                             12,688
71                                34,885                             13,918
                                  34,292                             13,942
                                  34,322                             13,860
                                  35,455                             14,504
72                                41,224                             15,338
                                  43,701                             15,439
                                  40,153                             16,043
                                  41,173                             17,256
73                                34,564                             16,414
                                  29,152                             15,467
                                  34,457                             16,212
                                  25,877                             14,731
74                                26,617                             14,315
                                  22,659                             13,233
                                  17,871                              9,904
                                  17,957                             10,832
75                                24,869                             13,317
                                  30,432                             15,363
                                  26,625                             13,681
                                  28,201                             14,863
76                                34,507                             17,088
                                  35,908                             17,513
                                  36,608                             17,848
                                  40,716                             18,408
77                                40,573                             17,039
                                  43,535                             17,589
                                  41,881                             17,093
                                  46,496                             17,071
78                                47,979                             16,231
                                  53,463                             17,612
                                  57,008                             19,139
                                  53,496                             18,194
79                                59,691                             19,482
                                  66,305                             20,012
                                  72,683                             21,522
                                  78,404                             21,550
80                                72,343                             20,671
                                  88,989                             23,443
                                 100,567                             26,069
                                 109,990                             28,535
81                               118,261                             28,911
                                 112,277                             28,244
                                  95,110                             25,357
                                 101,473                             27,135
82                                88,281                             25,173
                                  85,421                             25,017
                                 101,753                             27,884
                                 116,548                             32,942
83                               123,518                             36,252
                                 139,600                             40,280
                                 137,688                             40,224
                                 135,388                             40,360
84                               126,209                             39,444
                                 120,794                             38,427
                                 128,912                             42,146
                                 131,890                             42,888
85                               141,636                             46,838
                                 152,840                             50,281
                                 144,449                             48,219
                                 168,124                             56,518
86                               190,686                             64,492
                                 193,566                             68,291
                                 183,849                             63,531
                                 191,625                             67,095
87                               234,473                             81,420
                                 239,045                             85,507
                                 250,495                             91,151
                                 243,431                             70,614
88                               256,723                             74,632
                                 275,566                             79,603
                                 272,535                             79,866
                                 276,841                             82,310
'89                              291,209                             88,137
                                 294,238                             95,911
                                 294,767                            106,173
                                 305,644                            108,360
'90                              310,901                            105,099
                                 325,203                            111,709
                                 327,935                             96,372
                                 337,510                            105,007
'91                              349,256                            120,243
                                 353,307                            119,966
                                 362,352                            126,277
                                 369,381                            136,922
'92                              360,812                            133,471
                                 365,719                            136,007
                                 373,070                            140,292
                                 380,867                            147,334
'93                              378,086                            153,758
                                 383,682                            154,496
                                 375,318                            158,482
                                 389,017                            162,159
'94                              378,708                            156,013
                                 370,717                            156,668
                                 377,687                            164,314
                                 366,092                            164,281
'95                              375,281                            180,265
                                 390,404                            197,445
                                 397,978                            213,122
                                 391,770                            225,952
'96                              386,363                            238,085
                                 380,104                            248,775
                                 393,484                            256,462
                                 391,477                            277,826
'97                              390,890                            285,272
                                 390,890                            335,108
                                 399,138                            360,175
                                 403,249                            370,512
'98                              400,144                            422,198
                                 392,741                            436,130
                                 394,901                            392,735
                                 382,225                            476,899
'99                              386,468                            500,696
                                 388,400                            536,045
                                 393,605                            502,542
                                 404,074                            577,321
'00                              410,504                            590,541
                                 411,858                            574,833
                                 415,581                            569,257
                                 424,366                            524,741
'01                              434,931                            462,507
                                 436,340                            489,563
                                 433,875                            417,647
                                 442,406                            462,376
'02                              440,600                            463,671
                                 399,429                            401,539
                                 391,122                            332,153
                                 390,400                            360,187
'03                              388,955                            348,841
                                 387,511                            402,528
                                 385,344                            413,195
                                 382,816                            463,522
'04                              380,288                            471,355
                                 379,927                            479,463
                                 379,565                            470,497
                                 378,843                            513,924

PERCENT AVERAGE ANNUAL RETURNS *
                          1 YR     5 YRS    10 YRS   20 YRS   30 YRS    39 YRS**
                         -----     -----    ------   ------   ------    --------
GABELLI MATHERS FUND     (1.04)   (1.28)     0.35     5.42     10.70     9.67
Standard & Poor's 500    10.88    (2.30)    12.07    13.22     13.73    10.52

*    All periods ended 12/31/04. Average annual returns reflect changes in share
     price  and  reinvestment  of  dividends  and are net of  expenses.  Returns
     represent past performance and do not guarantee future results.  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. Current  performance may be lower or higher than the performance data
     presented.  Please visit www.gabelli.com to obtain performance  information
     as of the most recent  month end. The Standard & Poor's 500 is an unmanaged
     indicator  of stock  market  performance.  Investors  should  consider  the
     investment  objectives,  risks,  charges and expenses of the Fund carefully
     before investing.  The prospectus contains more complete  information about
     this and other matters and should be read carefully before investing.
 **  From commencement of investment  operations on August 19, 1965. To obtain a
     copy  of  the  Fund's  prospectus,  please  contact  Gabelli  Funds  at One
     Corporate Center, Rye, NY 10580-1422, by calling 800-GABELLI (800-422-3554)
     or visit our website www.gabelli.com.


                                        2



THE GABELLI MATHERS FUND
DISCLOSURE OF FUND EXPENSES (UNAUDITED)
For the Six Month  Period from July 1, 2004  through  December  31,  2004
                                                                   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 year ended December 31, 2004.

                    Beginning        Ending      Annualized     Expenses
                  Account Value   Account Value    Expense    Paid During
                      7/1/04        12/31/04        Ratio       Period*
- --------------------------------------------------------------------------------
THE GABELLI MATHERS FUND
- --------------------------------------------------------------------------------
ACTUAL FUND RETURN
Gabelli Mathers    $1,000.00        $  997.10       1.70%       $8.53

HYPOTHETICAL 5% RETURN
Gabelli Mathers    $1,000.00        $1,016.59       1.70%       $8.62

*    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
     366.

                                        3


SUMMARY OF PORTFOLIO HOLDINGS (UNAUDITED)

Under  SEC  rules,  all  funds are  required  to  include  in their  annual  and
semi-annual shareholder reports a presentation of portfolio holdings in a table,
chart or graph by reasonably identifiable categories. The following tables which
present  portfolio  holdings  as a percent of total net assets are  provided  in
compliance with such requirement.

THE GABELLI MATHERS FUND -
   LONG POSITIONS                                PERCENT


U.S. Government Obligations ....................  87.2
Entertainment ..................................   3.0
Repurchase Agreements ..........................   2.6
Broadcasting ...................................   1.8
Computer Software and Services .................   1.6
Energy and Utilities ...........................   1.4
Financial Services .............................   0.8
Health Care ....................................   0.7
Environmental Services .........................   0.5
Telecommunications .............................   0.5
Food and Beverage ..............................   0.3
Equipment ......................................   0.1


THE GABELLI MATHERS FUND -
   SHORT POSITIONS                               PERCENT


Consumer Products ..............................  (3.4)
Retail .........................................  (2.4)
Exchange Traded Funds ..........................  (1.5)
Equipment ......................................  (1.3)
Restaurants ....................................  (1.0)
Automotive .....................................  (0.7)
Home Furnishings ...............................  (0.7)
Entertainment ..................................  (0.4)
Metals and Mining ..............................  (0.4)



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 FIRST OF WHICH WAS
FILED FOR THE QUARTER  ENDED  SEPTEMBER 30, 2004.  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 and procedures  are available (i) without  charge,
upon  request,  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.


                                        4


THE GABELLI MATHERS FUND
SCHEDULE OF INVESTMENTS -- DECEMBER 31, 2004
- --------------------------------------------------------------------------------


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

               COMMON STOCKS -- 10.7%
               BROADCASTING -- 1.8%
      50,000   Liberty Media Corp., Cl. A+ ............$   434,141   $  549,000
       4,000   Liberty Media International Inc., Cl. A+    142,331      184,920
                                                       -----------  -----------
                                                           576,472      733,920
                                                       -----------  -----------
               COMPUTER SOFTWARE AND SERVICES -- 1.6%
      10,000   CACI International Inc., Cl. A+ ........    409,791      681,300
                                                       -----------  -----------
               ENERGY AND UTILITIES -- 1.4%
         500   Anadarko Petroleum Corp. ...............     22,080       32,405
         500   Cinergy Corp. ..........................     18,045       20,815
       1,000   Duquesne Light Holdings Inc. ...........     15,295       18,850
         500   Murphy Oil Corp. .......................     29,891       40,225
      15,000   Unisource Energy Corp. .................    369,917      361,650
       3,000   Veolia Environnement, ADR ..............    101,550      109,350
                                                       -----------  -----------
                                                           556,778      583,295
                                                       -----------  -----------
               ENTERTAINMENT -- 3.0%
       6,000   Gemstar-TV Guide
                International Inc.+ ...................     35,273       35,520
     100,000   Metro-Goldwyn-Mayer Inc.+ ..............  1,205,468    1,188,000
                                                       -----------  -----------
                                                         1,240,741    1,223,520
                                                       -----------  -----------
               ENVIRONMENTAL SERVICES -- 0.5%
       7,000   Waste Management Inc. ..................    209,383      209,580
                                                       -----------  -----------
               EQUIPMENT -- 0.1%
       2,500   Ultratech Inc.+ ........................     44,996       47,125
                                                       -----------  -----------
               FINANCIAL SERVICES -- 0.8%
      15,000   New York Community Bancorp Inc. ........    274,039      308,550
       1,000   Onyx Acceptance Corp. ..................     27,230       27,960
                                                       -----------  -----------
                                                           301,269      336,510
                                                       -----------  -----------
               FOOD AND BEVERAGE -- 0.3%
         500   Dreyer's Grand Ice Cream
                Holdings Inc., Cl. A ..................     39,595       40,215
       4,000   Hain Celestial Group Inc.+ .............     68,261       82,680
                                                       -----------  -----------
                                                           107,856      122,895
                                                       -----------  -----------
               HEALTH CARE -- 0.7%
       1,500   Abbott Laboratories ....................     69,119       69,975
       6,000   Baxter International Inc. ..............    198,326      207,240
                                                       -----------  -----------
                                                           267,445      277,215
                                                       -----------  -----------

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

               TELECOMMUNICATIONS -- 0.5%
      35,000   ADC Telecommunications Inc.+ ...........$    93,379  $    93,800
       1,000   BellSouth Corp. ........................     24,080       27,790
       1,000   SBC Communications Inc. ................     22,310       25,770
       1,000   Verizon Communications Inc.                  32,920       40,510
                                                       -----------  -----------
                                                           172,689      187,870
                                                       -----------  -----------
               TOTAL COMMON STOCKS                       3,887,420    4,403,230
                                                       -----------  -----------

   PRINCIPAL
    AMOUNT
   ---------
               U.S.  GOVERNMENT  OBLIGATIONS -- 87.2%
 $36,000,000   U.S.  Treasury Bills,
                1.964%++, 01/06/05 (a) ................ 35,990,325   35,990,325
                                                       -----------  -----------
               REPURCHASE AGREEMENTS -- 2.6%
   1,077,859   State Street Bank & Trust Co.,
                1.500%, dated 12/31/2004,
                due 01/03/05, proceeds at
                maturity, $1,077,994 (b) ..............  1,077,859    1,077,859
                                                       -----------  -----------
               TOTAL
                 INVESTMENTS -- 100.5% ................$40,955,604   41,471,414
                                                       ===========  ===========
               OTHER ASSETS AND LIABILITIES (NET) -- (0.5)% ......     (213,575)
                                                                    ------------
               NET ASSETS -- 100.0% ..............................  $41,257,839
                                                                    ===========
               SECURITIES SOLD SHORT -- (11.8)%

                                                                         MARKET
      SHARES                                             PROCEEDS         VALUE
      ------                                             --------       -------
               COMMON STOCKS -- (11.8)%
               AUTOMOTIVE -- (0.7)%
      20,000   Ford Motor Co. .........................$   295,041  $   292,800
                                                       -----------  -----------
               CONSUMER PRODUCTS -- (3.4)%
       6,000   Harley-Davidson Inc. ...................    348,694      364,500
      15,000   Polaris Industries Inc..................    587,733    1,020,300
                                                       -----------  -----------
                                                           936,427    1,384,800
                                                       -----------  -----------
               ENTERTAINMENT -- (0.4)%
       3,000   Carnival Corp. .........................    137,442      172,890
                                                       -----------  -----------
               EQUIPMENT -- (1.3)%
       4,000   Black & Decker Corp. ...................    263,933      353,320
       2,000   Toro Co. ...............................    137,195      162,700
                                                       -----------  -----------
                                                           401,128      516,020
                                                       -----------  -----------

                See accompanying notes to financial statements.
                                       5



THE GABELLI MATHERS FUND
SCHEDULE OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 2004
- --------------------------------------------------------------------------------
                                                                         MARKET
      SHARES                                              PROCEEDS        VALUE
      ------                                              --------      -------
               SECURITIES SOLD SHORT (CONTINUED)
               COMMON STOCKS
               EXCHANGE TRADED FUNDS -- (1.5)%
       5,000   Standard & Poor's Depository Receipts   $   603,836  $   604,350
                                                       -----------  -----------
               HOME FURNISHINGS -- (0.7)%
       4,000   Ethan Allen Interiors Inc. .............    157,125      160,080
       9,000   La-Z-Boy Inc. ..........................    187,298      138,330
                                                       -----------  -----------
                                                          344,423       298,410
                                                       -----------  -----------
               METALS AND MINING -- (0.4)%
      10,000   AK Steel Holding Corp. .................    145,497      144,700
                                                       -----------  -----------
               RESTAURANTS -- (1.0)%
       6,000   Cheesecake Factory Inc. ................    147,592      194,820
       5,000   McDonald's Corp. .......................    125,858      160,300
       1,000   Starbucks Corp. ........................     47,182       62,360
                                                       -----------  -----------
                                                           320,632      417,480
                                                       -----------  -----------
               RETAIL -- (2.4)%
       3,000   Kohl's Corp. ...........................    142,901      147,510
       5,000   The Home Depot Inc. ....................    161,867      213,700
      12,000   Tiffany & Co. ..........................    349,888      383,640
       8,000   Zale Corp. .............................    213,939      238,960
                                                       -----------  -----------
                                                           868,595      983,810
                                                       -----------  -----------

               TOTAL SECURITIES
                  SOLD SHORT ..........................$ 4,053,021  $ 4,815,260
                                                       ===========  ===========

- ----------------

               For Federal tax purposes:
               Aggregate cost ....................................  $40,955,604
                                                                    ===========
               Gross unrealized appreciation .....................  $   541,545
               Gross unrealized depreciation .....................      (25,735)
                                                                    -----------
               Net unrealized appreciation (depreciation) ........  $   515,810
                                                                    ===========
- ----------------

(a)  At December 31, 2004,  $24,997,000  of the principal  amount
     was pledged as collateral for securities sold short.
(b)  Collateralized by U.S. Treasury Bond,  5.250%, due 02/15/29,
     market value $1,101,790.
 +   Non-income producing security.
++   Represents annualized yield at date of purchase.

                 See accompanying notes to financial statements.

                                        6




                            THE GABELLI MATHERS FUND

STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 2004
- --------------------------------------------------------------------------------

ASSETS:
  Investments, at value (Cost $40,955,604)   $41,471,414
  Deposit at brokers ......................    4,618,833
  Dividends and interest receivable .......        3,173
  Receivable for fund shares sold .........          526
  Receivable for investments sold .........      248,266
  Other assets ............................        3,691
                                             -----------
  TOTAL ASSETS ............................   46,345,903
                                             -----------
LIABILITIES:
  Securities sold short (proceeds $4,053,021)  4,815,260
  Payable for investments purchased .......      154,044
  Dividends payable on securities sold short       3,799
  Payable for investment advisory fees ....       35,175
  Payable for distribution fees ...........        8,794
  Other accrued expenses and liabilities ..       70,992
                                             -----------
  TOTAL LIABILITIES .......................    5,088,064
                                             -----------
  NET ASSETS applicable to 3,933,803
    shares outstanding ....................  $41,257,839
                                             ===========
NET ASSETS CONSIST OF:
  Shares of beneficial interest, at
    $1.00 par value .......................  $ 3,933,803
  Additional paid-in capital ..............   58,816,367
  Accumulated net realized loss on investments
    and securities sold short .............  (21,245,902)
  Net unrealized depreciation on
    securities sold short .................     (762,239)
  Net unrealized appreciation on investments     515,810
                                             -----------
  NET ASSETS ..............................  $41,257,839
                                             ===========
  NET ASSET VALUE, offering and redemption price
    per share ($41,257,839 / 3,933,803 shares
    outstanding; 100,000,000 shares authorized)   $10.49
                                                  ======

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 2004
- --------------------------------------------------------------------------------

INVESTMENT INCOME:
  Dividends (net of foreign taxes of $959)   $    34,010
  Interest ................................      533,169
  Other income ............................       45,259
                                             -----------
  TOTAL INVESTMENT INCOME .................      612,438
                                             -----------
EXPENSES:
  Investment advisory fees ................      477,238
  Distribution fees .......................      119,309
  Dividends on securities sold short ......       61,857
  Trustees' fees ..........................       59,500
  Shareholder services fees ...............       46,984
  Shareholder communications expenses .....       41,682
  Legal and audit fees ....................       35,307
  Custodian fees ..........................       26,693
  Registration fees .......................       16,275
  Miscellaneous expenses ..................       20,545
                                             -----------
  TOTAL EXPENSES ..........................      905,390
                                             -----------
  NET INVESTMENT LOSS .....................     (292,952)
                                             -----------
NET REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS AND SECURITIES SOLD SHORT:
  Net realized gain on investments ........      300,236
  Net realized loss on securities sold short    (575,794)
  Net change in unrealized appreciation/
    depreciation on investments and
    securities sold short .................        1,130
                                             -----------
  NET REALIZED AND UNREALIZED LOSS ON
    INVESTMENTS AND SECURITIES SOLD SHORT..     (274,428)
                                             -----------
  NET DECREASE IN NET ASSETS RESULTING
    FROM OPERATIONS .......................    $(567,380)
                                             ===========


STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------



                                                                                  YEAR ENDED          YEAR ENDED
                                                                               DECEMBER 31, 2004   DECEMBER 31, 2003
                                                                               -----------------   -----------------
OPERATIONS:
                                                                                                 
  Net investment loss .......................................................... $   (292,952)       $   (456,610)
  Net realized gain (loss) on investments ......................................      300,236            (132,253)
  Net realized loss on securities sold short ...................................     (575,794)           (537,948)
  Net change in unrealized appreciation/depreciation on investments and
    securities sold short ......................................................        1,130            (356,240)
                                                                                 ------------        ------------
  NET DECREASE IN NET ASSETS RESULTING FROM OPERATIONS .........................     (567,380)         (1,483,051)
                                                                                 ------------        ------------
SHARES OF BENEFICIAL INTEREST TRANSACTIONS:
  Net decrease in net assets from shares of beneficial interest transactions ...  (19,020,306)        (18,498,603)
                                                                                 ------------        ------------
  NET DECREASE IN NET ASSETS ...................................................  (19,587,686)        (19,981,654)
NET ASSETS:
  Beginning of period ..........................................................   60,845,525          80,827,179
                                                                                 ------------        ------------
  End of period ................................................................ $ 41,257,839        $ 60,845,525
                                                                                 ============        ============




                 See accompanying notes to financial statements.

                                        7




THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

1. ORGANIZATION. The Gabelli Mathers Fund (the "Fund") was organized on June 17,
1999 as a Delaware statutory trust. The Fund commenced investment  operations on
October 1, 1999 as the successor to the Mathers Fund,  Inc. (the "Mathers Fund")
which was  organized  on March 31, 1965 as a Maryland  corporation.  The Mathers
Fund  commenced  investment  operations  on  August  19,  1965.  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 long-term capital appreciation.

2. SIGNIFICANT  ACCOUNTING POLICIES.  The preparation of financial statements in
accordance  with  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").

Portfolio securities primarily traded on foreign markets are generally valued at
the preceding closing values of such securities on their respective exchanges or
if after the close of the foreign markets, but prior to the close of business on
the day the securities are being valued, market conditions change significantly,
certain foreign securities may be fair valued pursuant to procedures established
by the Board.  Debt  instruments  that are not credit  impaired  with  remaining
maturities  of 60 days or less 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 valued at their fair value 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 latest average of the 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
valued  at their  fair  value  as  determined  in good  faith  under  procedures
established by and under the general  supervision  of 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.

                                       8



THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

REPURCHASE  AGREEMENTS.  The Fund may  enter  into  repurchase  agreements  with
primary  government  securities dealers recognized by the Federal Reserve Board,
with member banks of the Federal Reserve System or with other brokers or dealers
that meet credit  guidelines  established  by the  Adviser  and  reviewed by the
Board.  Under  the  terms of a  typical  repurchase  agreement,  the Fund  takes
possession  of an  underlying  debt  obligation  subject to an obligation of the
seller to repurchase,  and the Fund to resell,  the obligation at an agreed-upon
price and time, thereby  determining the yield during the Fund's holding period.
The Fund will always receive and maintain  securities as collateral whose market
value, including accrued interest,  will be at least equal to 102% of the dollar
amount  invested by the Fund in each  agreement.  The Fund will make payment for
such  securities  only upon  physical  delivery  or upon  evidence of book entry
transfer of the collateral to the account of the  custodian.  To the extent that
any repurchase transaction exceeds one business day, the value of the collateral
is marked-to-market on a daily basis to maintain the adequacy of the collateral.
If the seller defaults and the value of the collateral declines or if bankruptcy
proceedings   are  commenced  with  respect  to  the  seller  of  the  security,
realization of the collateral by the Fund may be delayed or limited.

FUTURES  CONTRACTS.  The Fund may engage in futures contracts for the purpose of
hedging  against  changes in the value of its  portfolio  securities  and in the
value of  securities  it  intends  to  purchase.  Upon  entering  into a futures
contract,  the Fund is required to deposit  with the broker an amount of cash or
cash equivalents equal to a certain  percentage of the contract amount.  This is
known as the "initial margin." Subsequent payments ("variation margin") are made
or  received by the Fund each day,  depending  on the daily  fluctuation  in the
value of the  contract.  The daily  changes  in the  contract  are  included  in
unrealized gains or losses. The Fund recognizes a realized gain or loss when the
contract is closed. At December 31, 2004, there were no open futures contracts.

There are several  risks in  connection  with the use of futures  contracts as a
hedging device. The change in value of futures contracts  primarily  corresponds
with the value of their underlying instruments, which may not correlate with the
change in value of the hedged investments.  In addition,  there is the risk that
the Fund may not be able to  enter  into a  closing  transaction  because  of an
illiquid secondary market.

SECURITIES  SOLD SHORT. A short sale involves  selling a security which the Fund
does not own. The proceeds  received for short sales are recorded as liabilities
and the Fund records an unrealized  gain or loss to the extent of the difference
between the proceeds  received  and the value of the open short  position on the
day of  determination.  The Fund records a realized  gain or loss when the short
position is closed out. By entering into a short sale, the Fund bears the market
risk of an unfavorable change in the price of the security sold short. Dividends
on short sales are  recorded as an expense by the Fund on the  ex-dividend  date
and interest expense is recorded on the accrual basis.  Securities sold short at
December 31, 2004 are reflected in the Schedule of Investments.

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 as earned.
Dividend income is recorded on the ex-dividend date.

                                       9



THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

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.

DIVIDENDS AND  DISTRIBUTIONS  TO  SHAREHOLDERS.  Dividends and  distributions to
shareholders are recorded on the ex-dividend date. Distributions to shareholders
are based on  ordinary  income and  long-term  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.

No distributions were made in the fiscal years ended December 31, 2004 and 2003.

These book/tax  differences  are either temporary or permanent in nature. To the
extent these differences are permanent,  adjustments are made to the appropriate
equity accounts in the period that the differences arise.

For the year ended  December 31, 2004,  reclassifications  were made to decrease
accumulated  net  investment  loss by $292,952 and to decrease  accumulated  net
realized loss on investments by  $22,226,886,  with an offsetting  adjustment to
additional paid-in capital.  These  reclassifications  have no impact on the net
asset value of the Fund and the  calculation of net investment  income per share
in the financial highlights excludes these adjustments.

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 Fund's  policy 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.

As of December 31, 2004, the components of earnings/(losses) on a tax basis were
as follows:

      Capital loss carryforward ................................. $(21,245,902)
      Net unrealized appreciation/(depreciation) of investments..      515,810
      Net unrealized appreciation/(depreciation) of securities
        sold short ..............................................     (762,239)
                                                                  ------------
      Total accumulated loss .................................... $(21,492,331)
                                                                  ============

The Fund has a net capital loss  carryforward for Federal income tax purposes at
December 31, 2004 of $21,245,902. This capital loss carryforward is available to
reduce  future  required  distributions  of net capital  gains to  shareholders.
$22,226,886 of the loss  carryforward  expired in 2004;  $7,869,968 is available
through  2006;  $12,430,175  is available  through  2010;  $670,201 is available
through 2011; and $275,558 is available through 2012.

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 the Fund's 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 its affiliates.

                                       10



THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

4.  DISTRIBUTION  PLAN.  The Fund's Board has adopted a  distribution  plan (the
"Plan")  pursuant to Rule 12b-1 under the 1940 Act. For the year ended  December
31, 2004,  the Fund  incurred  distribution  costs payable to Gabelli & Company,
Inc.,  an affiliate of the Adviser,  of $119,309,  or 0.25% of average daily net
assets,  the annual  limitation  under the Plan. Such payments are accrued daily
and paid monthly.

5. PORTFOLIO SECURITIES. Purchases and proceeds from the sales of securities for
the year ended December 31, 2004, other than short term  securities,  aggregated
$6,325,877 and $5,382,191, respectively.

6.  TRANSACTIONS  WITH AFFILIATES.  During the year ended December 31, 2004, the
Fund paid brokerage commissions of $8,800 to Gabelli & Company, Inc.

The cost of  calculating  the Fund's net asset value per share is a Fund expense
pursuant to the Advisory Agreement between the Fund and the Adviser.  During the
year  ended  December  31,  2004,  the Fund  reimbursed  the  Adviser  $8,700 in
connection  with the cost of  computing  the  Fund's net asset  value,  which is
included in miscellaneous expenses in the Statement of Operations.

7. SHARES OF BENEFICIAL INTEREST.  Transactions in shares of beneficial interest
were as follows:

                            YEAR ENDED                   YEAR ENDED
                         DECEMBER 31, 2004            DECEMBER 31, 2003
                   --------------------------     -------------------------
                     SHARES          AMOUNT         SHARES         AMOUNT

Shares sold .......   239,007    $  2,532,625       271,933    $  2,922,779
Shares redeemed ...(2,043,820)    (21,552,931)   (2,007,763)    (21,421,382)
                   ----------    ------------     ---------    ------------
   Net decrease ...(1,804,813)   $(19,020,306)   (1,735,830)   $(18,498,603)
                   ==========    ============     =========    ============

The Fund  imposed a redemption  fee of 2.00% on shares that are  purchased on or
after November 1, 2004, and redeemed or exchanged  within 60 days 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 fee did 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 until March 31, 2005 to implement
such systems.

8. 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  shares  trading  practices.   Gabelli  Asset  Management  Inc.  is
responding to these  requests. The Fund does not believe that these matters will
have a material adverse effect on the Fund's  financial  position or the results
of its operations.

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.

                                       11


THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

10.  FINANCIAL  HIGHLIGHTS.  Selected  data for a share of  beneficial  interest
outstanding throughout each period:



                                                                            YEAR ENDED DECEMBER 31,
                                                    -------------------------------------------------------------------
                                                        2004          2003           2002          2001          2000
                                                       ------        ------         ------        ------        ------
                                                                                                
OPERATING PERFORMANCE:
   Net asset value, beginning of period ..........   $ 10.60       $  10.81        $ 12.25       $ 12.05       $ 11.94
                                                     -------       --------        -------       -------       -------
   Net investment income (loss) ..................     (0.06)         (0.07)         (0.00)(a)      0.30          0.49
   Net realized and unrealized
     gain/(loss) on investments ..................     (0.05)         (0.14)         (1.44)         0.21          0.11
                                                     -------       --------        -------       -------       -------
   Total from investment operations ..............     (0.11)         (0.21)         (1.44)         0.51          0.60
                                                     -------       --------        -------       -------       -------
DISTRIBUTIONS TO SHAREHOLDERS:
   Net investment income .........................        --             --             --         (0.31)        (0.49)
                                                     -------       --------        -------       -------       -------
   Total distributions ...........................        --             --             --         (0.31)        (0.49)
                                                     -------       --------        -------       -------       -------
   NET ASSET VALUE, END OF PERIOD ................   $ 10.49       $  10.60        $ 10.81       $ 12.25       $ 12.05
                                                     =======       ========        =======       =======       =======
   Total return+ .................................   (1.04)%        (1.94)%       (11.76)%         4.25%         5.02%
                                                     =======       ========        =======       =======       =======
RATIOS TO AVERAGE NET ASSETS
   AND SUPPLEMENTAL DATA:
   Net assets, end of period (in 000's) ..........   $41,258        $60,846        $80,827       $97,893       $99,855
   Ratio of net investment income
     to average net assets .......................   (0.61)%        (0.61)%        (0.00)%         2.45%         3.79%
   Ratio of operating expenses
     to average net assets .......................     1.77%          1.67%          1.63%         1.35%         1.34%
   Portfolio turnover rate .......................      176%           244%           776%         1013%          977%

- ----------
  + 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 dividends.
(a) Amount is less than $0.005 per share.

                                       12


THE GABELLI MATHERS FUND
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
- --------------------------------------------------------------------------------
To the Shareholders and Board of Trustees of
The Gabelli Mathers Fund

We have audited the accompanying statement of assets and liabilities,  including
the schedule of  investments,  of the Gabelli  Mathers Fund (the "Fund"),  as of
December 31, 2004,  and the related  statement of  operations  for the year then
ended,  the  statement of changes in net assets for each of the two years in the
period then ended,  and the financial  highlights  for each of the five years in
the period then ended. These financial  statements and financial  highlights are
the responsibility of the Fund's management. Our responsibility is to express an
opinion on these  financial  statements  and financial  highlights  based on our
audits.

We conducted our audits in accordance  with the standards of the Public  Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements and financial highlights are free of material misstatement.  An audit
includes  consideration of internal control over financial  reporting as a basis
for designing audit  procedures that are appropriate in the  circumstances,  but
not for the purpose of expressing an opinion on the  effectiveness of the Fund's
internal  control  over  financial  reporting.  Accordingly,  we express no such
opinion. An audit also includes examining,  on a test basis, evidence supporting
the  amounts  and   disclosures  in  the  financial   statements  and  financial
highlights,  assessing the accounting  principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
Our  procedures  included  confirmation  of securities  owned as of December 31,
2004,  by  correspondence  with the  Fund's  custodian  and  brokers or by other
appropriate auditing procedures where replies from brokers were not received. We
believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements and financial  highlights referred to
above present fairly, in all material  respects,  the financial  position of the
Gabelli Mathers Fund at December 31, 2004, the results of its operations for the
year then ended,  the changes in its net assets for each of the two years in the
period then ended,  and the financial  highlights  for each of the five years in
the period then ended, in conformity  with U.S.  generally  accepted  accounting
principles.

                                                     /s/ ERNST & YOUNG LLP
New York, New York
February 11, 2005

                                       13



THE GABELLI MATHERS FUND
ADDITIONAL FUND INFORMATION (UNAUDITED)
- --------------------------------------------------------------------------------

The  business  and affairs of the Fund are managed  under the  direction  of the
Fund's Board of Trustees. Information pertaining to the Trustees and Officers of
the Fund is set forth  below.  The Fund's  Statement of  Additional  Information
includes  additional  information  about the Fund's  Trustees and is  available,
without  charge,  upon  request,  by calling  800-GABELLI  (800-422-3554)  or by
writing to The Gabelli Mathers Fund at One Corporate Center, Rye, NY 10580-1422.




                          TERM OF        NUMBER OF
NAME, POSITION(S)       OFFICE AND     FUNDS IN FUND
    ADDRESS 1             LENGTH OF   COMPLEX OVERSEEN     PRINCIPAL OCCUPATION(S)                  OTHER DIRECTORSHIPS
    AND AGE            TIME SERVED 2     BY TRUSTEE        DURING PAST FIVE YEARS                    HELD BY TRUSTEE 5
- --------------         ------------  ----------------     ----------------------                    ------------------
                                                                                    
INTERESTED TRUSTEES:3
- --------------------
MARIO J. GABELLI, CFA   Since 1999          24    Chairman of the Board, Chief Executive        Director of Morgan Group
Trustee and Chairman                              Officer of Gabelli Asset Management Inc. and  Holdings, Inc.
Age: 62                                           Chief Investment Officer of Gabelli Funds,    (holding company)
                                                  LLC and GAMCO Investors, Inc.; Vice
                                                  Chairman and Chief Executive Officer of
                                                  Lynch Interactive Corporation (multimedia
                                                  and services)

KARL OTTO POHL          Since 1999          34    Member of the Shareholder Committee of        Sal  Director of Gabelli Asset
Trustee                                           Oppenheim Jr. & Cie (private investment       Management Inc. (investment
Age: 75                                           bank); Former President of the                management); Chairman,
                                                  Deutsche Bundesbank and Chairman of its       Incentive Capital and Incentive
                                                  Central Bank Council (1980-1991)              Asset Management (Zurich);
                                                                                                Director at Sal Oppenheim
                                                                                                Jr. & Cie, Zurich

HENRY G. VAN            Since 1976           4    Senior Vice President of Gabelli Asset                --
DER EB, CFA 4                                     Management Inc. as of August 2004;
Trustee, President and                            President and CEO of Gabelli Mathers
Chief Executive Officer                           Fund since 1999; Senior Vice President and
Age: 59                                           Portfolio Manager of Gabelli Funds, LLC
                                                  and GAMCO Investors, Inc. since 1999;
                                                  Prior to October 1999, Chairman and Chief
                                                  Executive Officer of Mathers Fund, Inc. and
                                                  President of Mathers and Company, Inc.;
                                                  Chairman of Ned Davis Research Funds

NON-INTERESTED TRUSTEES:
- ------------------------
E. VAL CERUTTI          Since 2001           7    Chief Executive Officer of Cerutti            Director of Lynch
Trustee                                           Consultants, Inc.; Former President           Corporation (diversified
Age: 65                                           and Chief Operating Officer of Stella         manufacturing)
                                                  D'oro Biscuit Company(through 1992);
                                                  Adviser, Iona College School of Business

ANTHONY J. COLAVITA     Since 1999          36    President and Attorney at Law in the law firm         --
Trustee                                           of Anthony J. Colavita, P.C.
Age: 69

VINCENT D. ENRIGHT      Since 1999          13    Former Senior Vice President and Chief        Director of Aphton Corporation
Trustee                                           Financial Officer of KeySpan Energy           (biopharmaceutical company)
Age: 61                                           Corporation

ANTHONY R. PUSTORINO    Since 1999          17    Certified Public Accountant; Professor        Director of Lynch
Trustee                                           Emeritus, Pace University                     Corporation (diversified
Age: 79                                                                                         manufacturing)

WERNER J. ROEDER, MD    Since 1999          26    Medical Director of Lawrence                          --
Trustee                                           Hospital and practicing private physician
Age: 64

ANTHONIE C. VAN EKRIS   Since 1999          20    Managing Director of BALMAC                   Director of Aurado
Trustee                                              International, Inc. (commodities)          Energy, Inc.
Age: 70                                                                                         (oil and gas operations)



                                     14


THE GABELLI MATHERS FUND
ADDITIONAL FUND INFORMATION (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------



                             TERM OF        NUMBER OF
NAME, POSITION(S)          OFFICE AND     FUNDS IN FUND
    ADDRESS 1                LENGTH OF   COMPLEX OVERSEEN     PRINCIPAL OCCUPATION(S)                    OTHER DIRECTORSHIPS
    AND AGE               TIME SERVED 2     BY TRUSTEE        DURING PAST FIVE YEARS                      HELD BY TRUSTEE 5
- --------------            ------------  ----------------     ----------------------                      ------------------
                                                                                                  
OFFICERS:
- ---------
BRUCE N. ALPERT            Since 1999          --         Executive Vice President and Chief Operating              --
Executive Vice President                                  Officer of Gabelli Funds, LLC since 1988 and
and Treasurer                                             an officer of all mutual funds advised by
Age: 53                                                   Gabelli Funds, LLC and its affiliates.
                                                          Director and President of Gabelli Advisers, Inc.

EDITH L. COOK 4          Since 1984            --         Vice President of The Gabelli Mathers Fund since 1999.    --
Vice President                                            Prior to October 1999, Vice President and
Age: 63                                                   Treasurer of Mathers Fund, Inc. and Vice
                                                          President of Mathers and Company, Inc.

HEIDI M. KOONTZ 4        Since 1995            --         Vice President of The Gabelli Mathers Fund since--
Vice President                                            1999. Prior to October 1999, Vice President of
Age: 36                                                   Mathers Fund, Inc.

JAMES E. MCKEE           Since 1999            --         Vice President, General Counsel and Secretary             --
Vice President and                                        of Gabelli Asset Management Inc. since 1999
Secretary                                                 and GAMCO Investors, Inc. since 1993; Secretary
Age: 41                                                   of all mutual funds advised by Gabelli Advisers,
                                                          Inc. and Gabelli Funds, LLC

ANNE E. MORRISSY, CFA 4  Since 1987            --         Executive Vice President of The Gabelli Mathers Fund      --
Executive Vice President                                  and Vice President of Gabelli Asset Management Inc.
Age: 43                                                   since 1999. Prior to October 1999, Executive Vice
                                                          President, Secretary and Director of Mathers
                                                          Fund, Inc. and Vice President of Mathers and
                                                          Company, Inc.

PETER GOLDSTEIN          Since 2004            --         Director of Regulatory Affairs at Gabelli Asset            --
Chief Compliance Officer                                  Management Inc. since February 2004; Vice President
Age: 51                                                   of Goldman Sachs Asset Management from November 2000
                                                          through January 2004; Deputy General Counsel at
                                                          Gabelli Asset Management Inc. from February 1998
                                                          through November 2000


- ----------
  1 Address: One Corporate Center, Rye, NY 10580-1422, unless otherwise noted.
  2 Each Trustee will hold office for an  indefinite  term until the earliest of
    (i) the next  meeting of  shareholders  if any,  called  for the  purpose of
    considering  the  election  or  re-election  of such  Trustee  and until the
    election and qualification of his or her successor,  if any, elected at such
    meeting,  or (ii) the date a Trustee  resigns  or  retires,  or a Trustee is
    removed by the Board of Trustees or  shareholders,  in  accordance  with the
    Fund's By-Laws and  Declaration of Trust.  Each officer will hold office for
    an indefinite  term until the date he or she resigns or retires or until his
    or her successor is elected and qualified.
  3 "Interested  person" of the Fund as defined in the Investment Company Act of
    1940.  Messrs.  Gabelli,  Pohl  and  Van  der  Eb  are  each  considered  an
    "interested  person" because of their  affiliation  with Gabelli Funds,  LLC
    which acts as the Fund's investment adviser.
  4 Address: 2801 Lakeside Drive, Suite 201, Bannockburn, IL 60015.
  5 This column includes only  directorships of companies  required to report to
    the SEC under the Securities Exchange Act of 1934 (i.e. public companies) or
    other investment companies registered under the 1940 Act.


                                       15




                            THE GABELLI MATHERS 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                          Anthony R. Pustorino
   CHAIRMAN AND CHIEF                             CERTIFIED PUBLIC ACCOUNTANT
   INVESTMENT OFFICER                             PROFESSOR EMERITUS,
   GABELLI ASSET MANAGEMENT INC.                  PACE UNIVERSITY

   E. Val Cerutti                                 Werner J. Roeder, MD
   CHIEF EXECUTIVE OFFICER                        MEDICAL DIRECTOR
   CERUTTI CONSULTANTS, INC.                      LAWRENCE HOSPITAL

   Anthony J. Colavita                            Henry G. Van der Eb, CFA
   ATTORNEY-AT-LAW                                PRESIDENT AND CHIEF
   ANTHONY J. COLAVITA, P.C.                      EXECUTIVE OFFICER
                                                  THE GABELLI MATHERS FUND
   Vincent D. Enright
   FORMER SENIOR VICE PRESIDENT                   Anthonie C. van Ekris
   AND CHIEF FINANCIAL OFFICER                    MANAGING DIRECTOR
   KEYSPAN ENERGY CORP.                           BALMAC INTERNATIONAL, INC.

   Karl Otto Pohl
   FORMER PRESIDENT
   DEUTSCHE BUNDESBANK

                         OFFICERS AND PORTFOLIO MANAGER

   Henry G. Van der Eb, CFA                       Anne E. Morrissy, CFA
   PRESIDENT AND                                  EXECUTIVE VICE PRESIDENT
   PORTFOLIO MANAGER
                                                  Heidi M. Koontz
   Bruce N. Alpert                                VICE PRESIDENT
   EXECUTIVE VICE PRESIDENT
   AND TREASURER                                  Edith L. Cook
                                                  VICE PRESIDENT
   James E. McKee
   VICE PRESIDENT                                 Peter Goldstein
   AND SECRETARY                                  CHIEF COMPLIANCE OFFICER

                                   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
Gabelli  Mathers Fund. It is not  authorized  for  distribution  to  prospective
investors unless preceded or accompanied by an effective prospectus.
- --------------------------------------------------------------------------------

GAB1726Q404SR



ITEM 2. CODE OF ETHICS.

   (a)  The registrant,  as of the end of the period covered by this report, has
        adopted a code of ethics  that  applies  to the  registrant's  principal
        executive officer,  principal  financial officer,  principal  accounting
        officer  or  controller,   or  persons   performing  similar  functions,
        regardless of whether these  individuals  are employed by the registrant
        or a third party.

   (c)  There have been no amendments, during the period covered by this report,
        to a provision  of the code of ethics that  applies to the  registrant's
        principal  executive officer,  principal  financial  officer,  principal
        accounting   officer  or  controller,   or  persons  performing  similar
        functions,  regardless of whether these  individuals are employed by the
        registrant or a third party, and that relates to any element of the code
        of ethics description.


   (d)  The  registrant  has not  granted  any  waivers,  including  an implicit
        waiver,  from a  provision  of the code of ethics  that  applies  to the
        registrant's  principal executive officer,  principal financial officer,
        principal  accounting  officer  or  controller,  or  persons  performing
        similar functions,  regardless of whether these individuals are employed
        by the  registrant or a third party,  that relates to one or more of the
        items set forth in paragraph (b) of this item's instructions.



ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

As of the end of the period  covered by the report,  the  registrant's  Board of
Trustees has  determined  that Anthony R.  Pustorino is qualified to serve as an
audit committee  financial  expert serving on its audit committee and that he is
"independent," as defined by Item 3 of Form N-CSR.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Audit Fees
- ----------

   (a)  The  aggregate  fees  billed for each of the last two  fiscal  years for
        professional services rendered by the principal accountant for the audit
        of the  registrant's  annual  financial  statements or services that are
        normally  provided by the  accountant in connection  with  statutory and
        regulatory  filings or engagements for those fiscal years are $26,200 in
        2004 and $24,500 in 2003.

Audit-Related Fees
- ------------------



   (b)  The  aggregate  fees  billed  in each of the last two  fiscal  years for
        assurance  and related  services by the  principal  accountant  that are
        reasonably  related to the performance of the audit of the  registrant's
        financial  statements and are not reported  under  paragraph (a) of this
        Item are $0 in 2004 and $0 in 2003.

Tax Fees
- --------

   (c)  The  aggregate  fees  billed  in each of the last two  fiscal  years for
        professional  services  rendered  by the  principal  accountant  for tax
        compliance,  tax advice,  and tax planning are $3,600 in 2004 and $3,250
        in 2003.

        Tax fees represent tax compliance  services provided in  connection with
        the review of the Registrant's tax returns.

All Other Fees
- --------------

   (d)  The  aggregate  fees  billed  in each of the last two  fiscal  years for
        products and services provided by the principal  accountant,  other than
        the services  reported in paragraphs (a) through (c) of this Item are $0
        in 2004 and $0 in 2003.

   (e)(1)  Disclose the audit committee's  pre-approval  policies and procedures
           described in paragraph (c)(7) of Rule 2-01 of Regulation S-X.

           Pre-Approval   Policies   and   Procedures.   The   Audit   Committee
           ("Committee") of the registrant is responsible for  pre-approving (i)
           all audit and  permissible  non-audit  services to be provided by the
           independent  auditors  to the  registrant  and (ii)  all  permissible
           non-audit services to be provided by the independent  auditors to the
           Adviser,  Gabelli Funds, LLC, and any affiliate of Gabelli Funds, LLC
           ("Gabelli")  that  provides  services to the  registrant  (a "Covered
           Services Provider") if the independent  auditors'  engagement related
           directly to the operations and financial reporting of the registrant.
           The Committee may delegate its responsibility to pre-approve any such
           audit and  permissible  non-audit  services to the Chairperson of the
           Committee,  and the Chairperson must report to the Committee,  at its
           next regularly scheduled meeting after the Chairperson's pre-approval
           of such  services,  his or her  decision(s).  The  Committee may also
           establish   detailed   pre-approval   policies  and   procedures  for
           pre-approval  of such services in accordance  with  applicable  laws,
           including  the   delegation  of  some  or  all  of  the   Committee's
           pre-approval  responsibilities  to  the  other  persons  (other  than
           Gabelli or the registrant's officers).  Pre-approval by the Committee
           of any permissible non-audit services is not required so long as: (i)
           the  aggregate  amount  of all such  permissible  non-audit  services
           provided to the registrant, Gabelli and any Covered Services Provider
           constitutes  not more than 5% of the total amount of revenues paid by
           the registrant to its independent  auditors during the fiscal year in
           which the  permissible  non-audit  services  are  provided;  (ii) the
           permissible  non-audit services were not recognized by the registrant
           at the time of the  engagement  to be non-audit  services;  and (iii)
           such services are promptly  brought to the attention of the Committee
           and approved by the Committee or Chairperson  prior to the completion
           of the audit.

   (e)(2)  The  percentage  of  services  described  in each of  paragraphs  (b)
           through (d) of this Item that were  approved  by the audit  committee
           pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X are
           as follows:

                           (b) N/A


                           (c) 100%

                           (d) N/A

   (f)  The  percentage  of  hours   expended  on  the  principal   accountant's
        engagement to audit the registrant's  financial  statements for the most
        recent  fiscal year that were  attributed  to work  performed by persons
        other than the principal accountant's full-time, permanent employees was
        zero percent (0%).

   (g)  The aggregate  non-audit fees billed by the registrant's  accountant for
        services  rendered to the registrant,  and rendered to the  registrant's
        investment   adviser  (not  including  any  sub-adviser  whose  role  is
        primarily portfolio  management and is subcontracted with or overseen by
        another investment adviser), and any entity controlling,  controlled by,
        or under common control with the adviser that provides  ongoing services
        to the  registrant  for  each  of  the  last  two  fiscal  years  of the
        registrant was $68,600 in 2004 and $62,250 in 2003.

   (h)  The  registrant's   audit  committee  of  the  board  of  directors  has
        considered  whether  the  provision  of  non-audit  services  that  were
        rendered to the  registrant's  investment  adviser  (not  including  any
        sub-adviser  whose  role  is  primarily  portfolio   management  and  is
        subcontracted with or overseen by another investment  adviser),  and any
        entity  controlling,  controlled  by, or under  common  control with the
        investment adviser that provides ongoing services to the registrant that
        were not pre-approved  pursuant to paragraph  (c)(7)(ii) of Rule 2-01 of
        Regulation S-X is compatible with maintaining the principal accountant's
        independence.

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  Directors,  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)  Code of ethics, that is the subject of disclosure required by Item 2,
           filed as exhibit  (a)(1) to the  Registrant's  Form  N-CSR,  filed on
           March  10,  2004   (Accession   No.   0000935069-04-000473).

   (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 Gabelli Mathers Fund
            --------------------------------------------------------------------

By (Signature and Title)*  /s/ Henry G. Van der Eb
                         -------------------------------------------------------
                           Henry G. Van der Eb, Chief Executive Officer


Date     March 9, 2005
    ----------------------------------------------------------------------------


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/ Henry G. Van der Eb
                         -------------------------------------------------------
                          Henry G. Van der Eb, Chief Executive Officer


Date     March 9, 2005
    ----------------------------------------------------------------------------


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

Date     March 9, 2005
    ----------------------------------------------------------------------------


* Print the name and title of each signing officer under his or her signature.