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

                                    FORM 11-K

                          |X| ANNUAL REPORT PURSUANT TO
                              SECTION 15(d) OF THE
                           SECURITIES EXCHANGE ACT OF
                                      1934

                   For the fiscal year ended December 31, 2002

             |_| TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                         Commission File Number 0-26481

      A. Full title of the plan and the address of the plan, if different from
      that of the issuer named below:

                    FINANCIAL INSTITUTIONS, INC. 401(k) PLAN

      B. Name of issuer of the securities held pursuant to the plan and the
      address of its principal executive office:

                          FINANCIAL INSTITUTIONS, INC.
                               220 Liberty Street
                                Warsaw, NY 14569



                              REQUIRED INFORMATION

A.  Financial Statements and Schedule                                       Page

    Independent Auditors' Report                                               1

    Financial Statements:
         Statement of Net Assets Available for Benefits
             at December 31, 2002 and 2001                                     2

         Statements of Changes in Net Assets Available for Plan Benefits
             for the Years Ended December 31, 2002 and 2001                    3

         Notes to Financial Statements                                         4

    Supplemental Schedule:
         Schedule H, Line 4i - Schedule of Assets (Held at End of Year)        8


  Exhibits

    23       Consent of Independent Auditors

    99.1     Certification Pursuant to 18 U.S.C. Section 1350 as Adopted
             Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (CEO)

    99.2     Certification Pursuant to 18 U.S.C. Section 1350, as Adopted
              Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (CFO)



                                   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.

                                      FINANCIAL INSTITUTIONS, INC. 401(k) PLAN

Date:  June 30, 2003                  /s/ Peter G. Humphrey
                                      ---------------------

                                      Peter G. Humphrey
                                      President and Chief Executive Officer



                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                        Financial Statements and Schedule

                           December 31, 2002 and 2001

                   (With Independent Auditors' Report Thereon)



                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                                      Index

                                                                            Page

Independent Auditors' Report                                                   1

Statements of Net Assets Available for Benefits at December 31, 2002
  and 2001                                                                     2

Statements of Changes in Net Assets Available for Benefits for the years
  ended December 31, 2002 and 2001                                             3

Notes to Financial Statements                                                  4

Schedule

Schedule H, Line 4i - Schedule of Assets (Held at End of Year)                 8



                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN


                          Independent Auditors' Report

The Participants and Plan Administrator
   Financial Institutions, Inc. 401(k) Plan:

We have audited the accompanying statements of net assets available for benefits
of Financial Institutions, Inc. 401(k) Plan as of December 31, 2002 and 2001,
and the related statements of changes in net assets available for benefits for
the years then ended. 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 in accordance with auditing standards generally accepted
in the United States of America. 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. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, the financial statements, referred to above, of Financial
Institutions, Inc. 401(k) Plan as of December 31, 2002 and 2001, and for the
years then ended present fairly, in all material respects, the financial status
of Financial Institutions, Inc. 401(k) Plan as of December 31, 2002 and 2001 and
changes in its financial status for the years then ended in conformity with
accounting principles generally accepted in the United States of America.

Our audits were performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. Supplemental Schedule H, Line 4i -
Schedule of Assets (Held at End of Year) 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. This supplemental schedule is the responsibility of the
Plan's management. The supplemental schedule has been subjected to the auditing
procedures applied in the audit 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.


                                                            /s/ KPMG LLP

June 20, 2003



                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                 Statements of Net Assets Available for Benefits

                           December 31, 2002 and 2001



                                                               2002         2001
                                                          ------------   -----------
                                                                   
Assets:
     Investments, at fair value:
        Mutual funds                                       $14,257,058            --
        Financial Institutions, Inc. common stock              598,239            --
        Investments in pooled separate accounts (note 3)            --    14,770,897
     Participants loans                                        316,081       238,598
                                                           -----------   -----------
                 Total investments                          15,171,378    15,009,495
     Receivables:
        Employer contribution                                   14,795         5,292
        Participant contributions                               46,123        26,860
        Dividends                                               20,407            --
                                                           -----------   -----------
                 Total receivables                              81,325        32,152
                                                           -----------   -----------
                 Net assets available for benefits         $15,252,703    15,041,647
                                                           ===========   ===========


See accompanying notes to financial statements.


                                       2


                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

           Statements of Changes in Net Assets Available for Benefits

                     Years ended December 31, 2002 and 2001



                                                               2002            2001
                                                          -------------    ------------
                                                                       
Additions:
     Additions to net assets attributed to:
        Investment income (loss):
           Net depreciation in fair value of investments   $ (1,786,259)     (1,303,929)
           Interest from participant loans                       27,299          23,072
                                                           ------------    ------------
                 Total investment loss                       (1,758,960)     (1,280,857)
                                                           ------------    ------------
     Contributions and transfers:
        Transfers in from other plans                           618,609       4,023,612
        Participant                                           1,711,559       1,224,328
        Employer                                                730,363         550,176
                                                           ------------    ------------
                 Total contributions and transfers            3,060,531       5,798,116
                                                           ------------    ------------
                 Total additions                              1,301,571       4,517,259
Deductions:
     Deductions from net assets attributed to:
        Benefits paid to participants                         1,090,515       1,288,348
                                                           ------------    ------------
                 Net increase                                   211,056       3,228,911
Net assets available for benefits:
     Beginning of year                                       15,041,647      11,812,736
                                                           ------------    ------------
     End of year                                           $ 15,252,703      15,041,647
                                                           ============    ============


See accompanying notes to financial statements.


                                       3


                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001

(1)   Description of the Plan

      The following description of the Financial Institutions, Inc. 401(k) Plan
      (the Plan) provides only general information. Participants should refer to
      the Plan agreement for a complete description of the Plan's provisions.

      (a)   General

            The Plan is a defined contribution plan sponsored and administered
            by Financial Institutions, Inc. (the Company). All employees of the
            Company and its subsidiaries are eligible to participate in the Plan
            on the first of the month following the date of their employment and
            upon the attainment of age 20-1/2. Participants become eligible to
            receive the employer match following completion of one year of
            service, based on hire date anniversary. The Plan is subject to the
            provisions of the Employee Retirement Income Security Act of 1974
            (ERISA).

            During 2002, $551,689 in assets were transferred into the Plan from
            the Burke Group and $66,920 from the Avaca acquisition. During 2001,
            the Bath National Bank Defined Contribution Plan and the Bath
            National Bank 401(k) Retirement Plan were merged into the Plan.
            Total assets transferred as a result of the mergers were $4,023,612.

            Administration of the Plan is the responsibility of the executive
            committee (the Trustee) of the Company. Fidelity Investments
            Institutional Brokerage Group (the Custodian or Fidelity) holds the
            assets of the Plan and invests, controls, and disburses the funds of
            the Plan in accordance with the Plan agreement. In addition, during
            2002 the Plan changed recordkeepers to the Burke Group
            (party-in-interest).

      (b)   Contributions

            Each year, participants may contribute up to 50% (15% in 2001) of
            pretax annual compensation, as defined in the Plan. Participants may
            also contribute amounts representing distributions from other
            qualified defined benefit or defined contribution plans.
            Participants direct the investment of their contributions and the
            Company's matching contributions into various investment options
            offered by the Plan. During 2002, the Plan changed custodians from
            the Aetna Life Insurance and Annuity Company to Fidelity.
            Concurrently with the change in custodians the Plan investment
            options changed from pooled separate accounts managed by Aetna to
            various mutual funds managed by Fidelity. In addition, effective May
            1, 2002 Plan participants were able to select the Company's common
            stock as an investment option for up to 25% of their total account
            balance. The Company matches 25% of a participant's contributions up
            to the first 8% of compensation. The Company may also make
            additional discretionary contributions ($453,676 in 2002 and
            $340,396 in 2001). Contributions are subject to certain limitations.

      (c)   Participant Accounts

            Each participant's account is credited with the participant's
            contributions, the Company's matching contributions, and all
            earnings thereon.


                                       4


                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001

      (d)   Vesting

            Company and participant contributions, and all earnings thereon, are
            fully vested at the time of contribution.

      (e)   Payment of Benefits

            The participant's account balance will be distributed upon
            termination of employment due to separation from service,
            retirement, disability, or death, or upon financial hardship as
            defined in the Internal Revenue Code (IRC).

            When a participant terminates employment, the participant may elect
            to receive benefits in a lump-sum distribution or a deferred
            annuity. If the participant's account attributable to Company
            contributions is $5,000 or less, the form of the distribution is at
            the discretion of the administrator.

            Withdrawal of an active employee's before-tax contributions prior to
            a participant reaching age 59-1/2 may only be made on account of
            financial hardship as determined by the Company.

      (f)   Participant Loans

            Participants may borrow from their accounts up to a maximum amount
            equal to the lesser of $50,000 or 50% of their account balances.
            Loan terms must have a definite repayment period not to exceed five
            years unless the loan is used for the purchase of a principal
            residence, in which case the repayment period may not exceed 15
            years. The loans are secured by the participant's account and bear
            interest at 2% points above the prime rate published in the Wall
            Street Journal. Principal and interest are paid ratably through
            after-tax payroll deductions.

      (g)   Plan Expenses

            Substantially all expenses related to the administration and
            investment activity of the Plan are borne by the Company and are
            therefore not reflected in the accompanying financial statements.

(2)   Summary of Significant Accounting Policies

      (a)   Basis of Accounting

            The financial statements have been prepared on the accrual basis in
            conformity with accounting principles generally accepted in the
            United States of America. In preparing these financial statements,
            the plan administrator has made a number of estimates and
            assumptions relating to the reporting of net assets available for
            benefits and changes therein. Actual results may differ from those
            estimates.

      (b)   Investments

      All   contributions made to the Plan may be invested in one or more
            investment options. The investments are carried at fair value.
            Transactions are accounted for on a trade date basis. Investment
            income includes interest, dividends and realized and unrealized
            gains and losses applicable to the plan shares in the funds. 5


                                       5


                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001

            The investments are exposed to various risks, such as interest rate,
            market and credit risk. Due to the level of risk associated with
            certain investments and the level of uncertainty related to changes
            in the value of investments, it is at least reasonably possible that
            changes in the near term would materially effect participants'
            account balances and the amounts reported in the statement of net
            assets available for benefits and the statement of changes in net
            assets available for benefits.

      (c)   Participant Loans - Payment of Benefits

            Any unpaid loan balance at the time a participant withdraws from the
            Plan is presented as a benefit payment on the statement of changes
            in net assets available for benefits. All other benefits are
            recorded when paid.

(3)   Investments

      The following presents investments that represent 5% or more of the Plan's
      net assets as of December 31, 2002 and 2001:

      2002

      Federated Capital Preservation Institutional Fund   $4,321,859
      Fidelity Equity Income Fund                          1,274,566
      Franklin Capital Growth Class A Fund                 1,649,272
      Gabelli Westwood Balanced Retail C1 Fund               944,535
      Pimco Total Return Administrative Shares Fund        1,064,719
      W&R Accumulative Class Y Fund                        1,111,224

      2001

      Aetna Money Market VP                               $  926,486
      Aetna Balanced VP                                      977,182
      Aetna Fixed Account                                  4,312,607
      Aetna Growth and Income VP                           1,676,655
      PPI MFS Emerging Equities Portfolio                    876,010
      Fidelity VIP Equity-Income Portfolio                 1,561,219
      Fidelity VIP Growth Portfolio                        1,240,521
      PPI T. Rowe Price Growth Equity Portfolio              998,848

      Net appreciation (depreciation) in fair value of investments for the years
      ended December 31, 2002 and 2001 are as follows:

                                                      2002          2001
                                                  -----------    -----------
      Mutual funds                                $(1,771,272)            --
      Financial Institutions Inc., common stock       (14,987)            --
      Investments in pooled separate accounts              --     (1,303,929)
                                                  -----------    -----------
                                                  $(1,786,259)    (1,303,929)
                                                  ===========    ===========


                                       6


                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

                          Notes to Financial Statements

                           December 31, 2002 and 2001

(4)   Plan Termination

      Although it has not expressed any intent to do so, the Company has the
      right under the Plan to discontinue its contributions at any time and to
      terminate the Plan subject to the provisions of ERISA. In the event of
      Plan termination, participants will receive their account balances.

(5)   Tax Status

      The Internal Revenue Service has determined and informed the Company by a
      letter dated March 28, 1999, that the Plan is designed in accordance with
      applicable sections of the IRC. Although the Plan has been amended since
      receiving the determination letter, the plan administrator believes that
      the Plan is designed and is currently being operated in compliance with
      the applicable requirement of the IRC.

(6)   Related-Party Transactions

      Certain plan investments are mutual managed by Fidelity. Fidelity is the
      custodian as defined by the Plan and, therefore, these transactions
      qualify as party-in-interest transactions. The Burke Group, a subsidiary
      company is the plan record-keeper (party-in-interest).


                                       7




                                                                      Schedule 1
                          FINANCIAL INSTITUTIONS, INC.
                                   401(k) PLAN

            Schedule H, Line 4i - Schedule of Assets (Held at End of
                             Year) December 31, 2002



                                                                (c) Description of investment,
                  (b) Identity of issuer,                         including maturity date,
                     borrower, lessor,                        rate of interest, collateral, and             (d) Current
 (a)                  or similar party                              par, or maturity value                      value
- ------  ---------------------------------------------   ------------------------------------------------   -----------------
                                                                                                  
        Federated Capital Preservation
           Institutional Fund                                             Mutual fund                      $   4,321,859
  *     Fidelity Contrafund                                               Mutual fund                            320,683
  *     Fidelity Equity Income Fund                                       Mutual fund                          1,274,566
        Franklin Capital Growth Class A Fund                              Mutual fund                          1,649,272
        Gabelli Westwood Balanced Retail
           C1 Fund                                                        Mutual fund                            944,535
        Janus Mercury Fund                                                Mutual fund                            570,683
        Nations International Value
            Investor A Fund                                               Mutual fund                            289,726
        Oppenheimer Capital Appreciation
           Class A Fund                                                   Mutual fund                             57,576
        Oppenheimer Global Class A Fund                                   Mutual fund                            596,667
        Pimco Total Return Administrative
           Shares Fund                                                    Mutual fund                          1,064,719
        Spartan 500 Index Fund                                            Mutual fund                            185,532
        Spartan Extended Market Index Fund                                Mutual fund                             54,042
        Spartan Money Market Fund                                         Mutual fund                            738,841
        Van Kampen Comstock Class A Fund                                  Mutual fund                            175,386
        Van Kampen Equity and Income
            Class A Fund                                                  Mutual fund                            167,620
        W&R Accumulative Class Y Fund                                     Mutual fund                          1,111,224
        Wasatch Small Cap Growth Fund                                     Mutual fund                            726,973
  *     Fidelity Cash Reserves                                            Mutual fund                              7,154
  *     Financial Institutions, Inc.                                     Common stock                            598,239
        Participant loans                                   6.25% - 11.5%, fully secured by vested
                                                                 benefits, due 2003 through 2016                 316,081
                                                                                                           -------------
                                                                                                           $  15,171,378
                                                                                                           =============


  * Party-in-interest transaction.

See accompanying independent auditors'
report.


                                       8