FORM 11-K

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                   (Mark One)
               [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                  For the fiscal year ended: December 31, 2003

                                       OR

             [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                 For the transition period from:___________ to ____________
                         Commission file number: 1-13754

                       THE ALLMERICA FINANCIAL EMPLOYEES'
                           401(K) MATCHED SAVINGS PLAN
                            (Full title of the plan)

                         ALLMERICA FINANCIAL CORPORATION
             (Exact name of registrant as specified in its charter
       Delaware                                                 04-3263626
 (State or other jurisdiction of                            (I.R.S. Employer
  incorporation or organization)                         Identification Number)

               440 Lincoln Street, Worcester, Massachusetts 01653
                    (Address of principal executive offices)
                                   (Zip Code)

                                 (508) 855-1000
              (Registrant's telephone number, including area code)

        _________________________________________________________________
         (Former name, former address and former fiscal year, if changed
          since last report)





The Allmerica Financial
Employees' 401(k) Matched
Savings Plan
Financial Statements
and Additional Information
December 31, 2003 and 2002









The Allmerica Financial Employees' 401(k) Matched Savings Plan
-------------------------------------------------------------------------------
December 31, 2003 and 2002





TABLE OF CONTENTS




Report of Independent Registered Public Accounting Firm.......................1
Statements of Net Assets Available for Benefits...............................2
Statements of Changes in Net Assets Available for Benefits....................3
Notes to Financial Statements...............................................4-9



Additional Information*



Schedule H, line 4i - Schedule of Assets (Held At End of Year)............10-11























*    Other  schedules  required by the Department of Labor Rules and Regulations
     on reporting and disclosure under the Employee  Retirement  Income Security
     Act of 1974, as amended, have been omitted because they are not applicable.



















             Report of Independent Registered Public Accounting Firm



To the Participants and Administrator of
  The Allmerica Financial Employees'
  401(k) Matched Savings Plan:

In our opinion, the accompanying statements of net assets available for benefits
and the  related  statement  of  changes in net assets  available  for  benefits
present fairly, in all material respects,  the net assets available for benefits
of The Allmerica  Financial  Employees' 401(k) Matched Savings Plan (the "Plan")
at December  31,  2003 and 2002,  and the  changes in net assets  available  for
benefits  for the years  then ended in  conformity  with  accounting  principles
generally accepted in the United States of America.  These financial  statements
are the  responsibility  of the  Plan's  management.  Our  responsibility  is to
express  an  opinion  on these  financial  statements  based on our  audits.  We
conducted our audits of these statements 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  are free of material  misstatement.  An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

Our audits  were  conducted  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of assets (held
at end of  year)  as of  December  31,  2003 is  presented  for the  purpose  of
additional analysis and is not a required part of the basic financial statements
but is supplementary information required by the Department of Labor's Rules and
Regulations for Reporting and Disclosure  under the Employee  Retirement  Income
Security Act of 1974. The  supplemental  schedule is the  responsibility  of the
Plan's management.  The supplemental schedule has been subjected to the auditing
procedures  applied in the audits of the basic financial  statements and, in our
opinion,  is fairly  stated in all  material  respects  in relation to the basic
financial statements taken as a whole.



Boston, MA
June 23, 2004










The Allmerica Financial Employees' 401(k) Matched Savings Plan
Statements of Net Assets Available for Benefits
At December 31,
--------------------------------------------------------------------------------


                                                           2003              2002
                                                   ----------------  ----------------
                                                                 
Assets
Investments, at fair value:

   Non-affiliated mutual funds:
       Fidelity Advisor Equity Income Fund         $   60,495,628*     $   49,393,176
       SSgA S&P 500 Index Fund                         44,039,499*         33,702,795
       Dreyfus Premier Core Bond Fund                  33,467,190*         34,458,681
       Dreyfus Cash Management Plus Fund               33,328,427*         47,429,131
       CRM Small Cap Value Fund                        15,903,590           9,251,789
       Putnam Vista Fund                               12,828,137           9,260,538
       Alliance Bernstein Premier Growth
         Institutional Fund                             9,642,704           6,843,130
       TCW Galileo Small Cap Growth Fund                4,308,779             982,224
       MFS High-Income Fund                             1,947,065             664,482
       Berger International Core Fund                       -               7,597,659
                                                  ----------------    ----------------
                                                      215,961,019         199,583,605

      Allmerica Financial Corporation
       Stock Fund, at fair value:
         Allmerica Financial Corporation Stock         23,848,138           8,173,450
         Cash and equivalents                           1,058,553             408,982
                                                  ----------------    ----------------
                                                       24,906,691*          8,582,432

Investment with First Allmerica Financial Life
Insurance Company, at contract value:
       Fixed Fund                                     116,772,652*         97,754,242

Participant loans                                       7,311,395           8,339,109

Other assets                                                -                 184,181
                                                  ----------------    ----------------
Net assets available for benefits                  $  364,951,757      $  314,443,569
                                                  ================    ================

* Amount represents five percent or more of net assets available for benefits at
  December 31, 2003.

















   The accompanying notes are an integral part of these financial statements.


                                       2




The Allmerica Financial Employees' 401(k) Matched Savings Plan
Statements of Changes in Net Assets Available for Benefits
For the years ended December 31,
--------------------------------------------------------------------------------


                                                         2003                 2002
                                                  -----------------   -----------------
                                                                 
Investment gain (loss):
  Net appreciation (depreciation) of:
      Non-affiliated mutual funds                   $   33,992,888     $  (32,138,302)
      Allmerica Financial Corporation
        Stock Fund                                      16,783,197        (27,288,493)
  Interest and dividend income                           7,747,968         10,111,449
  Other gain (loss)                                         96,778            (48,516)
                                                   ----------------   ----------------
                                                        58,620,831        (49,363,862)
                                                   ----------------   ----------------

Contributions:
  Employer contributions                                 5,320,009          4,976,086
  Employee contributions                                18,210,228         18,043,753
                                                   ----------------   ----------------
                                                        23,530,237         23,019,839
                                                   ----------------   ----------------

  Total investment gain (loss) and                      82,151,068        (26,344,023)
    contributions                                  ----------------   ----------------


Benefit payments                                       (31,642,880)       (48,575,773)
                                                   ----------------   ----------------

Net increase (decrease) during year                     50,508,188        (74,919,796)

Transfers out of Plan                                        -               (202,916)

Net assets available for benefits,
  beginning of year                                    314,443,569        389,566,281
                                                   ----------------   ----------------

Net assets available for benefits,
  end of year                                       $  364,951,757     $  314,443,569
                                                   ================   ================










   The accompanying notes are an integral part of these financial statements.


                                       3



The Allmerica Financial Employees' 401(k) Matched Savings Plan
Notes to Financial Statements
--------------------------------------------------------------------------------

NOTE 1 - Description of plan

The following  description of The Allmerica Financial  Employees' 401(k) Matched
Savings Plan ("the Plan") is provided for general  informational  purposes only.
More complete information is provided in the Summary Plan Description,  which is
available from the Plan Administrator.

General

The  Plan is a  defined  contribution  plan  for  eligible  employees  of  First
Allmerica  Financial Life  Insurance  Company  ("FAFLIC,"  "the Sponsor" or "the
Company"), a wholly-owned subsidiary of Allmerica Financial Corporation ("AFC").

The Plan is  administered  by the  Sponsor  ("the  Plan  Administrator")  and is
subject to the provisions of the Department of Labor's Rules and Regulations for
Reporting and Disclosure  under the Employee  Retirement  Income Security Act of
1974, as amended  ("ERISA").  The Plan's  recordkeeper is Hewitt Associates LLC.
State  Street  Bank and Trust  Company is the Trustee of the Plan and of the AFC
Stock. The Sponsor holds those assets invested in its Fixed Fund.

On October 13,  2003,  the Board of Directors  voted to change its  recordkeeper
from Hewitt  Associates  LLC to Fidelity  Management  Trust  Company,  effective
January 1, 2004. Additionally,  the Board of Directors voted to appoint Fidelity
Management  Trust Company  Trustee of the Plan,  effective  January 1, 2004. The
Fixed  Fund was  liquidated  at fair  value  effective  January 1, 2004 upon the
appointment of Fidelity  Management  Trust Company as recordkeeper  and Trustee.
These funds were reinvested in other investment vehicles offered by the Plan.

Eligibility

Active employees are eligible for  participation in the Plan on the first day of
employment with the Company, as defined by the Plan document.

Employer contributions

The Plan  has a 401(k)  match  provision.  Employees  are  eligible  to  receive
matching  contributions  in the  Plan on the  first  day of the  calendar  month
coincident with or next following  completion of one year of service, as defined
by the  Plan  document.  Under  this  provision,  the  amount  of the  match  is
determined by the Sponsor's Board of Directors and is announced at the beginning
of  each  year.  Employer  contributions  are  100%  vested  to the  participant
immediately upon receipt.  In addition,  the Board of Directors may require that
all  matching  contributions  be made  to the  AFC  Stock  Fund.  However,  this
restriction was not imposed during the 2003 or 2002 plan year.

In 2003 and  2002,  the  matching  contribution  rate was 50% of the first 6% of
participants'  401(k)  contributions  made to the Plan in each pay  period.  The
matching  contribution rate was not applied to any 2003 or 2002 401(k) "Catch-up
Contributions"  made  by  participants  (see  "Participant   accounts").   These
contributions  were  allocated to the same  investment  vehicles as the employee
contributions.

                                       4


NOTE 1 - Description of plan (continued)

Forfeitures

Forfeitures   of  employer   contributions   related  to  nonvested   terminated
participants  have been  transferred to the Dreyfus Cash Management Plus Fund in
2003 and 2002.  Forfeited amounts are used to offset the employer  contributions
and are allocated to the Plan's  investment  vehicles  based upon the investment
elections of each eligible participant. Forfeitures in the amount of $69,589 and
$495,908  were  used  to  reduce  employer   contributions  in  2003  and  2002,
respectively.

Participant accounts

Active   participants   in  the  Plan  are  eligible  to  make  401(k)  deferral
contributions  through  the use of a salary  reduction  plan up to a maximum  of
$12,000 for 2003 and $11,000 for 2002.

As a  result  of  the  Tax  Relief  Reconciliation  Act  of  2001,  a  "Catch-up
Contribution"  provision was established to allow employees,  who reach at least
50 years of age during the year,  to accelerate  the amount they defer,  up to a
maximum of $14,000 for 2003 and $12,000 for 2002. The amount  deferred in excess
of the annual limit is not eligible to receive the Company match. This provision
was  effective  January  1,  2002.  In  2003,  99  employees  accelerated  their
deferrals, which amounted to $180,440 in additional contributions.  During 2002,
69 employees  accelerated their deferrals resulting in additional  contributions
of $66,664.

As directed by participant election,  contributions can be invested in the Fixed
Fund, the non-affiliated  mutual funds, or the Allmerica  Financial  Corporation
Stock Fund. All investment  income is reinvested in the same investment  vehicle
and is credited to the respective participant account.

Participant loans

Loans made to active  participants  are  secured  by the  vested  portion of the
participant's  account up to the limit as defined  in the Plan  document.  Loans
vary in duration, depending upon purpose, and are at an interest rate determined
by the Plan  Administrator.  A participant  is limited to a maximum of two loans
outstanding  at any one time from all plans of the Company  combined.  Loan fees
are not charged to  employees.  Interest  income on  participant  loans  totaled
$492,746 and $690,633 in 2003 and 2002, respectively.

Distributions and vesting provisions

Vested  account  balances  are  payable in the event of  retirement,  death,  or
separation from service (including  disability) as defined in the Plan document.
Distributions  to participants  are payable either through a lump sum payment or
through  periodic  payments.   If  a  lump  sum  distribution  is  elected,  the
participant has the option of taking the AFC Stock Fund in-kind.

                                       5


NOTE 1 - Description of plan (continued)

A participant's  account balance is immediately vested and includes the employer
matching   contribution,   the  rollover   account,   the  after-tax   voluntary
contribution account and the tax deductible voluntary  contribution  account. In
addition,  all employer  profit sharing  contributions  for active  participants
(contributed for the plan years 1994 and prior) are now fully vested.

Payments from the fund are subject to limitations and requirements  specified in
the Plan document.

NOTE 2 - Significant accounting policies

Significant   accounting  and  reporting  policies  followed  by  the  Plan  are
summarized as follows:

Basis of presentation

The accompanying financial statements have been prepared on the accrual basis of
accounting in accordance with generally accepted accounting principles.

Use of estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting principles requires management to make estimates and assumptions that
affect the  reported  amounts  of assets  and  liabilities  and  disclosures  of
contingent  assets and  liabilities at the date of the financial  statements and
the  reported  amounts of revenues  and expenses  during the  reporting  period.
Actual results could differ from those estimates.

Valuation of investments

The  Fixed  Fund is held in the  Sponsor's  general  account  and  provides  for
guaranteed  rates of interest  reset  annually.  The credited  interest rate was
5.42% and 6.00% for monies invested in 2003 and 2002, respectively.  The average
rate of return for the Fixed Fund for the years ended December 31, 2003 and 2002
was 5.42% and 6.00%, respectively.

The  insurance  contracts  underlying  the  Fixed  Fund of the  Plan  are  fully
benefit-responsive  and are  therefore  exempt  from fair value  accounting  for
certain contracts under the provisions of Statement of Position 94-4,  Reporting
Investment  Contracts  Held by Health  and  Welfare  Benefit  Plans and  Defined
Contribution  Plans. As such, these  investments are recorded at contract value,
which approximates fair value at December 31, 2003 and 2002.

                                       6



NOTE 2 - Significant accounting policies (continued)

Investments in non-affiliated  mutual funds are priced using the end of day fair
market value of the underlying  funds as recorded by State Street Bank and Trust
Company,  which are based on the  published  net asset values of the funds.  The
investment  returns  of  the  non-affiliated   mutual  funds  and  the  separate
investment accounts of the Sponsor were as follows:


                                          Year Ended            Year Ended
 Non-Affiliated Mutual Funds           December 31, 2003     December 31, 2002
 ---------------------------           -----------------     -----------------

Fidelity Advisor Equity Income Fund         29.16 %              (15.20)%
SSgA S&P 500 Index Fund                     28.59 %              (22.34)%
Dreyfus Premier Core Bond Fund               7.32 %                5.88 %
Dreyfus Cash Management Plus Fund            0.84 %                1.59 %
CRM Small Cap Value Fund                    48.33 %              (17.83)%
Putnam Vista Fund                           33.39 %              (30.67)%
Alliance Bernstein Premier Growth
 Institutional Fund                         22.68 %              (30.81)%
TCW Galileo Small Cap Growth Fund           48.78 %              (47.50)%
MFS High-Income Fund                        22.76 %                0.76 %
Berger International Core Fund*            (11.39)%              (19.56)%

*The Berger  International Core Fund was liquidated as of March 31, 2003, due to
     a reorganization by Berger's parent company.  The return for the year ended
     December 31, 2003,  represents  the return  recognized for the three months
     ended  March 31,  2003,  which is the  period in which the Plan had  assets
     invested in the fund.

Due to  participant-directed  investment  activity,  actual  investment  returns
experienced by the  participants  in the Plan may differ from those displayed in
the above Fund returns.

The AFC Stock Fund is stated at fair value as determined by quoted market prices
of both AFC common stock and cash  equivalents  held in the Fund. The investment
return for 2003 and 2002 was 190.75% and (75.34)%, respectively.

Participant loans are valued at their outstanding values, which approximate fair
value.

Purchases  and sales of  securities  are  accounted  for as of the  trade  date.
Dividends are recorded on the  ex-dividend  date and interest income is recorded
on an accrual basis.

Net  appreciation  (depreciation)  on fair  the  value of  investments  includes
realized gains and (losses) and unrealized  appreciation  (depreciation)  of the
investments.
                                       7


NOTE 2 - Significant accounting policies (continued)

Other assets

Other assets  represent the value of  individual  annuities  purchased  from the
Sponsor and the annual  interest  earned plus the cash  surrender  value of life
insurance  contracts  held within the Plan. As of December 31, 2003,  all of the
annuities and life insurance contracts have been surrendered or reassigned.

Administrative expenses

Hewitt Associates LLC maintains  agreements with certain  non-affiliated  mutual
funds and for such  agreements  receives a portion of certain  asset-based  fees
(12b-1 fees) charged by the fund. These fees are calculated based on the average
daily net asset value of Plan  assets in each  respective  fund.  These fees are
used to reduce  charges  from Hewitt  Associates  LLC to the Sponsor for certain
administrative  and professional  services.  Fees to State Street Bank and Trust
for trustee related  services are  voluntarily  assumed and paid directly by the
Sponsor.  The Sponsor pays all other expenses incurred in the  administration of
the Plan.

Payment of benefits

Benefits are recorded when paid.

NOTE 3 - Federal income taxes

The Internal Revenue Service has determined and informed the Sponsor by a letter
dated  February 21, 2002,  that the Plan is qualified and the trust  established
under the Plan is tax exempt  under the  appropriate  sections  of the  Internal
Revenue Code.  The Plan  Administrator  believes  that the Plan  continues to be
designed and is  currently  being  operated in  compliance  with the  applicable
provisions of the Internal Revenue Code. Therefore,  no provision for income tax
is required.

NOTE 4 - Plan termination

Although  the  Sponsor has not  expressed  any intent to  terminate  the Plan or
discontinue  contributions,  it may do so at any time. Should the Plan terminate
or discontinue contributions, the Plan provides that each participant's interest
in the Plan's  assets as of the  termination  date shall  become 100% vested and
non- forfeitable and be either payable to the participant or applied to purchase
a non-forfeitable retirement annuity at the participant's option.


                                       8


NOTE 5 - Significant transactions and other matters

During  2002,  the  Sponsor  adopted a  restructuring  plan  related to its life
insurance and annuity business.  This restructuring  resulted in the elimination
of  approximately  476 positions,  of which 411 employees were  terminated as of
December 31, 2003 and 63 vacant positions were eliminated.  As a result of these
initiatives   plan  assets  declined  during  2002,   resulting  from  increased
withdrawals related to these terminated employees.

During 2002,  certain  employees became agents of the Company.  This resulted in
the  transfer  of $202,916 of Plan  assets to The  Allmerica  Financial  Agents'
Retirement  Plan in  accordance  with  Plan  provisions.  There  were no  assets
transferred between plans during 2003.

                                       9


The Allmerica Financial Employees' 401(k) Matched Savings Plan
Form 5500, Schedule H, Line 4i
Schedule of Assets (Held at End of Year)
At December 31, 2003
--------------------------------------------------------------------------------



       Identity of                      Description                        Shares or         Contract or
          Issue                        of Investments                        Units          Current Value
                                                                                   
Investment with First
Allmerica Financial Life
Insurance Company**:

    Fixed Fund                   Group annuity contract with                                $ 116,772,652 *
                                 interest rate at 5.42%

Investments with
non-affiliated mutual funds:


    Fidelity Advisor Equity      Diversified portfolio of mid- to             2,316,065        60,495,628 *
    Income Fund                  large-cap value companies

    SSgA S&P 500 Index Fund      Common stocks which comprise S&P 500         2,398,666        44,039,499 *
                                 Composite Stock Index

    Dreyfus Premier Core Bond    Broad-based, intermediate-term bond          2,948,048        33,467,190 *
    Fund                         fund designed to offer diversified
                                 exposure to the domestic fixed-income
                                 market

    Dreyfus Cash Management      Short-term money market fund that            3,196,589        33,328,427 *
    Plus Fund                    invests primarily in high-quality
                                 domestic and foreign U.S. Dollar
                                 denominated money market instruments

    CRM Small Cap                Small-cap fund focused on long-term            652,589        15,903,590
    Value Fund                   capital appreciation by investing in
                                 value-oriented securities

    Putnam Vista Fund            Growth oriented, mid-cap fund with           1,605,524        12,828,137
                                 domestic focus






                                       10



The Allmerica Financial Employees' 401(k) Matched Savings Plan
Form 5500, Schedule H, Line 4i (continued)
Schedule of Assets (Held at End of Year)
At December 31, 2003
--------------------------------------------------------------------------------



          Identity of                         Description                  Shares or         Contract or
             Issue                           of Investments                  Units          Current Value
                                                                                 
Investments with
Non-Affiliated Mutual Funds
(continued):

    Alliance Bernstein Premier   Large-cap growth fund investing in           1,073,798   $    9,642,704
    Growth Institutional Fund    companies with above average earnings
                                 growth


    TCW Galileo Small            Small-to mid-cap aggressive growth             293,714        4,308,779
    Cap Growth Fund              fund

    MFS High-Income Fund         Portfolio that seeks high current              161,618        1,947,065
                                 income by investing in higher
                                 yielding, lower rated debt of
                                 financially weaker companies

Allmerica Financial
Corporation Stock
Fund **:
   Allmerica Financial            Common stock traded on the New York                         23,848,138 *
   Corporation Stock              Stock Exchange

   Cash and equivalents                                                                        1,058,553

Participant loans                 Interest rates from 5.0% to 10.5%                            7,311,395

                                                                                          ---------------
Total Investments                                                                         $  364,951,757
                                                                                          ===============


*   Amount represents five percent or more of net assets available for benefits.
**  Represents party-in-interest.




                                       11




                                   SIGNATURES

The Plan.  Pursuant to the requirements of the Securities  Exchange Act of 1934,
the trustees (or other persons who  administer  the employee  benefit plan) have
duly  caused this  annual  report to be signed on its behalf by the  undersigned
hereunto duly authorized.


                                  THE ALLMERICA FINANCIAL EMPLOYEES'
                                  401(K) MATCHED SAVINGS PLAN
                                  ---------------------------
                                  (Name of Plan)

                                  /s/ Barbara Z. Rieck
                                  --------------------
                                  Plan Administrator:  First Allmerica Financial
                                  Life Insurance Company by Barbara Z. Rieck
                                  Manager of Retirement Services


                                  June 24, 2004



                                       12


Exhibit Index

Exhibit 23.1      Consent of Independent Registered Public Accounting Firm












                                       13