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, 2001

                                       OR

             [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


For the transition period from January 1, 2001 to December 31, 2001
Commission file number 000-31207

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

                 *First Northern Savings Bank 401(k) Savings Plan
                  201 N. Monroe Avenue
                  P.O. Box 23100
                  Green Bay, WI  54305-3100

                 *Combined into Bank Mutual Corporation 401(k) Plan on
                  January 1, 2002

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

                  Bank Mutual Corporation
                  4949 W. Brown Deer Road
                  P.O. Box 245034
                  Milwaukee, WI  53224-9534



                                   SIGNATURES


         The Plan. Pursuant to the requirements of the Securities Exchange Act
of 1934, the trustees have duly caused this annual report to be signed on its
behalf by the undersigned thereunto duly authorized.


                                            FIRST NORTHERN SAVINGS BANK
                                            401(K) SAVINGS PLAN

Date: June 26, 2002

                                            /s/ MICHAEL D. MEEUWSEN
                                            ------------------------------------
                                                Michael D. Meeuwsen, Trustee


                                            /s/ RICK B. COLBERG
                                            ------------------------------------
                                                Rick B. Colberg, Trustee

                                            /s/ MARLA J. CARR
                                            ------------------------------------
                                                Marla J. Carr, Trustee





                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN
                                                            Green Bay, Wisconsin


                                                        FINANCIAL STATEMENTS AND
                                                           SUPPLEMENTAL SCHEDULE
                                          Years Ended December 31, 2001 and 2000



                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                  FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE
                                          Years Ended December 31, 2001 and 2000
- --------------------------------------------------------------------------------


                                TABLE OF CONTENTS



                                                                                                             
INDEPENDENT AUDITOR'S REPORT.......................................................................................1

FINANCIAL STATEMENTS
     Statements of Net Assets Available for Benefits...............................................................2
     Statements of Changes in Net Assets Available for Benefits....................................................3
     Notes to Financial Statements.................................................................................4

SUPPLEMENTAL SCHEDULE
     Schedule 1 - Schedule H, Item IV(i) - Schedule of Assets Held for Investment Purposes........................11





                                 [WIPFLI LOGO]



                          INDEPENDENT AUDITOR'S REPORT



Board of Trustees
First Northern Savings Bank
 401(k) Savings Plan
Green Bay, Wisconsin


We have audited the accompanying statements of net assets available for benefits
of First Northern Savings Bank 401(k) Savings Plan as of December 31, 2001 and
2000, 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. 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 present fairly, in
all material respects, the net assets available for benefits of the Plan as of
December 31, 2001 and 2000, and the changes in its net assets available for
benefits for the years then ended in conformity with accounting principles
generally accepted in the United States.

Our audits were performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of assets held
for investment purposes as of December 31, 2001, 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 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.





Wipfli Ullrich Bertelson LLP


June 3, 2002
Green Bay, Wisconsin




                                                                               1

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                 STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
                                                      December 31, 2001 and 2000
- --------------------------------------------------------------------------------


                                                                                      2001                2000
- -------------------------------------------------------------------------------------------------------------------
                                                                                              
ASSETS

Investments                                                                        $11,469,748         $10,495,453
Receivable - Employer contribution                                                     401,121             313,322
- -------------------------------------------------------------------------------------------------------------------

Net assets available for benefits                                                  $11,870,869         $10,808,775
===================================================================================================================














See accompanying notes to financial statements.                                2


                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                      STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
                                          Years Ended December 31, 2001 and 2000
- --------------------------------------------------------------------------------


                                                                                    2001                2000
- ---------------------------------------------------------------------------------------------------------------------
                                                                                              
ADDITIONS TO NET ASSETS ATTRIBUTED TO:
 Investment income:
  Net appreciation in fair value of investments                                      $    90,683         $ 1,168,962
  Interest and dividends                                                                 285,907             168,448
- ---------------------------------------------------------------------------------------------------------------------

     Total investment income                                                             376,590           1,337,410
- ---------------------------------------------------------------------------------------------------------------------

 Contributions:
  Participant                                                                            422,915             434,790
  Employer                                                                               509,067             402,982
  Rollover                                                                                17,602              10,210
- ---------------------------------------------------------------------------------------------------------------------

     Total contributions                                                                 949,584             847,982
- ---------------------------------------------------------------------------------------------------------------------

  Total additions                                                                      1,326,174           2,185,392
- ---------------------------------------------------------------------------------------------------------------------

DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:
  Benefits paid to participants                                                          263,144           1,257,900
  Administrative expenses                                                                    936               1,790
- ---------------------------------------------------------------------------------------------------------------------

  Total deductions                                                                       264,080           1,259,690
- ---------------------------------------------------------------------------------------------------------------------

Net additions                                                                          1,062,094             925,702
Net assets available for benefits at beginning                                        10,808,775           9,883,073
- ---------------------------------------------------------------------------------------------------------------------

Net assets available for benefits at end                                             $11,870,869         $10,808,775
=====================================================================================================================




See accompanying notes to financial statements.                                3

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 1   PLAN DESCRIPTION

         The following description of First Northern Savings Bank 401(k) Savings
         Plan (the "Plan") provides only general information. Participants
         should refer to the Plan Agreement for a more complete description of
         the Plan's provisions.

                  GENERAL

         The Plan is a defined contribution 401(k) retirement savings plan
         covering substantially all employees of First Northern Savings Bank and
         its wholly owned subsidiaries (the "Bank") (a wholly owned subsidiary
         of Bank Mutual Corporation) who have been employed for one year and are
         21 years of age. The Plan is subject to the provisions of the Employee
         Retirement Income Security Act of 1974. The Plan is administered by
         certain officers of the Bank.

         EMPLOYEE CONTRIBUTIONS

         Participants may elect to defer a portion of their cash compensation
         (up to the lesser of 15% of annual compensation or $10,500 in 2001 and
         2000) and contribute this amount to the Plan. Amounts contributed are
         deducted from gross wages for each payroll period and are remitted to
         the Plan in accordance with the investment options selected by the
         participant.

         EMPLOYER CONTRIBUTIONS

         The Bank makes matching contributions equal to 50% of the employee's
         contributions. Employee contributions over 4% of annual cash
         compensation are not matched. Matching contributions are funded at each
         payroll date along with employee contributions. The Bank also makes an
         annual contribution equal to 3% of each qualified participant's annual
         cash compensation. In addition, the Bank, at its discretion, may make
         certain additional contributions as determined by the Board of
         Directors of the Bank. The additional contribution is equal to 3.75%
         and 2.50% of each qualified participant's annual cash compensation at
         December 31, 2001 and 2000, respectively.

         PARTICIPANTS' ACCOUNTS

         Each participant's account is credited with the participant's
         contributions, the Bank's matching, annual and discretionary
         contributions, and plan earnings (based on participant's investment
         election and account balance).




                                                                               4

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 1   PLAN DESCRIPTION (Continued)

         PARTICIPANT LOANS

         Participants may borrow from their fund accounts a minimum of $1,000 to
         a maximum equal to the lesser of $50,000 or 50% of their vested account
         balance. Loan terms range from one to five years. The loans are secured
         by the balance in the participant's account and bear interest at a rate
         commensurate with similar type loans made by the Bank. Principal and
         interest are paid ratably through monthly payroll deductions.

                  VESTING

         All employee contributions are 100% vested immediately. Employer
         contributions vest at 25% after two years of service, 50% after three
         years of service, and 100% after four years of service. In addition,
         there is full vesting upon normal retirement at age 65, death, or
         disability. Amounts forfeited are aggregated and used to offset future
         employer contributions.

         EXPENSES OF THE PLAN

         Administrative expenses charged by Principal Mutual Life Insurance
         Company, investment advisory fees, and substantially all other expenses
         incurred in conjunction with the Plan are paid by the Bank. Certain
         administrative expenses and withdrawal charges are paid out of plan
         assets.

         PAYMENT OF BENEFITS

         Plan benefits are available at normal retirement, deferred retirement,
         early withdrawal, disability retirement, death, or termination of
         employment.

         Participants may elect to receive benefit payments in the form of a
         lump-sum distribution or in installments.

         PLAN TERMINATION

         The Bank has reserved the right to terminate the Plan at any time. In
         the event of termination, all amounts credited to participants'
         accounts will be distributed to participants in accordance with the
         Plan's provisions.




                                                                               5

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 2            SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         METHOD OF ACCOUNTING

         The accounting records of First Northern Savings Bank 401(k) Savings
         Plan are maintained on the accrual basis of accounting in accordance
         with generally accepted accounting principles.

         USE OF ESTIMATES IN PREPARATION OF FINANCIAL STATEMENTS

         The preparation of the accompanying financial statements in conformity
         with generally accepted accounting principles requires the plan
         administrator to make estimates and assumptions that affect certain
         reported amounts and disclosures. Actual results may differ from these
         estimates.

         INVESTMENT VALUATION

         Investments are stated at fair value. Investments in the Principal
         Financial Group's Pooled Separate Accounts are carried at fair value
         which represents the quoted market price of the underlying investments.
         For investments in securities which do not have an established market,
         the trustee of the Plan establishes a fair value. The Guaranteed
         Interest Accounts include funds under group annuity contracts. The
         contracts are stated at fair market value, which is determined by
         adjusting the contract value for differences between the current market
         interest rate and the interest rate on the account. The fair value of
         Bank Mutual Corporation's common stock is its quoted market price.
         Security transactions are accounted for on the trade-date basis (the
         date the order to buy or sell is executed).

         Both realized and unrealized appreciation or depreciation is reflected
         for the year in the statement of changes in net assets available for
         benefits. Gains or losses on security transactions are recorded as the
         difference between proceeds received and the carrying value of the
         investments. Interest income is recognized on the accrual method, and
         dividend income is recorded on the ex-dividend date.



                                                                               6

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 3   INVESTMENTS

         The following is a schedule of investments that individually represents
         5% or more of the Plan's net assets at December 31:



                                                                  2001                                  2000
                                                    --------------------------------  -----------------------------------
                                                      ASSET FAIR        PERCENT OF      ASSET FAIR           PERCENT OF
                                                        VALUE           NET ASSETS        VALUE              NET ASSETS
         ----------------------------------------------------------------------------------------------------------------
                                                                                                 
         Principal Stable Value Account                 $682,672            5.8           $554,428                5.1
         Principal Small Company Blend Account         1,552,519           13.1          1,331,181               12.3
         Principal Large Company Blend Account         1,589,459           13.4          1,893,113               17.5
         Principal Small Company Growth Account          741,286            6.2            732,641                6.8
         Principal Medium Company Growth Account         903,345            7.6          1,063,064                9.8
         Principal Large Company Growth Account          949,809            8.0          1,286,974               11.9
         Bank Mutual Corporation Common Stock          3,218,106           27.1          1,786,550               16.5






         During 2001 and 2000, the Plan's investments (including investments
         bought or sold during the year as well as those held at the end of the
         year) appreciated (depreciated) as follows:



                                                                                       2001                2000
         ----------------------------------------------------------------------------------------------------------
                                                                                                   
         Pooled Separate Accounts                                                  ($1,043,775)          ($607,784)
         First Northern Capital Corporation Stock                                            0           1,874,923
         Bank Mutual Corporation Stock                                               1,134,458             (98,177)
         ----------------------------------------------------------------------------------------------------------

         Net appreciation                                                              $90,683          $1,168,962
         ==========================================================================================================






                                                                               7

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 4   TRANSACTIONS WITH PARTIES-IN-INTEREST

         First Northern Savings Bank serves as the sponsor of the Plan. As of
         January 1, 2000, First Northern Savings Bank was a wholly owned
         subsidiary of First Northern Capital Corporation (FNGB). In November
         2000, First Northern Savings Bank completed a merger with Bank Mutual
         Corporation. As of December 31, 2001 and 2000, First Northern Savings
         Bank is a wholly owned subsidiary of Bank Mutual Corporation. The Plan
         had the following transactions with these parties-in-interest:



                                                                              2001                2000
         ------------------------------------------------------------------------------------------------
                                                                                        
         Purchases of stock:
           Number of shares of FNGB stock                                          0              44,444
           Value of shares on transaction dates                             $      0            $524,705

           Number of shares of Bank Mutual Corporation stock                  25,581                 882
           Value of shares on transaction dates                             $342,049            $  8,697

         Sales of stock:
           Number of shares of FNGB stock                                          0              36,002
           Value of shares on transaction dates                             $      0            $459,037

           Number of shares of Bank Mutual Corporation stock                   3,006               2,702
           Value of shares on transaction dates                             $ 41,085            $ 22,471

         Exchange of common stock:
           FNGB shares exchanged                                                   0             348,388
           Bank Mutual Corporation shares received                                 0             189,854

         Dividend income received on FNGB stock                             $      0            $116,830
         Dividend income received on Bank Mutual Corporation stock          $ 56,339            $      0

         Plan administrative expenses paid by the Bank                      $ 19,874            $ 18,531



         At December 31, 2001 and 2000, the Plan held 210,609 shares and 188,034
         shares, respectively, of Bank Mutual Corporation common stock.



                                                                               8

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 5   TAX-EXEMPT STATUS OF THE PLAN

         On January 26, 1993, the Internal Revenue Service declared the Plan is
         qualified pursuant to Section 401 of the Internal Revenue Code. Plan
         management believes any amendments and events since the effective date
         of the last Internal Revenue Service determination letter do not affect
         the qualified status of the Plan. Accordingly, the Plan is exempt from
         federal and state income taxes under current provisions of their
         respective laws.



NOTE 6   RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

         The Form 5500 filed for December 31, 2001, presented net assets
         available for benefits on the modified cash basis of accounting. The
         Form 5500 filed for December 31, 2000, presented net assets available
         for benefits on the accrual basis of accounting.

         Following is a reconciliation of net assets available for benefits per
         the financial statements at December 31, 2001:


                                                                             
         Net assets available for benefits per the financial statements         $11,870,869
         Less - Employer contributions receivable                                   401,121
         -----------------------------------------------------------------------------------

         Net assets available for benefits per Form 5500                        $11,469,748
         ===================================================================================


         Following is a reconciliation of employer contributions received per
         the financial statements for the year ended December 31, 2001:



                                                                             
         Employer contributions per the financial statements                       $509,067
         Less - Employer contributions receivable at                                401,121
         December 31, 2001
         -----------------------------------------------------------------------------------

         Employer contributions per Form 5500                                      $107,946
         ===================================================================================






                                                                               9

                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN

                                                   NOTES TO FINANCIAL STATEMENTS

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

NOTE 7   SUBSEQUENT EVENT

         Effective December 31, 2001, the Plan was to merge with Mutual Savings
         Bank Savings and Investment Plan. The transfer of assets actually took
         place in early January 2002. Prior to the merger, both plans operated
         in a similar manner. The new plan's legal name is Bank Mutual
         Corporation 401(k) Plan.






                                                                              10




                                                           SUPPLEMENTAL SCHEDULE
- --------------------------------------------------------------------------------





                                                     FIRST NORTHERN SAVINGS BANK
                                                             401(K) SAVINGS PLAN
                                                Plan's EIN #39-0318280 Plan #002

                   SCHEDULE 1 - SCHEDULE H, ITEM IV(i) - SCHEDULE OF ASSETS HELD
                                                         FOR INVESTMENT PURPOSES
                                                               December 31, 2001
- --------------------------------------------------------------------------------


  IDENTITY OF ISSUE, BORROWER,                 DESCRIPTION OF INVESTMENT INCLUDING MATURITY DATE,                   CURRENT
    LESSOR, OR SIMILAR PARTY                     RATE OF INTEREST, COLLATERAL, PAR, OR MATURITY VALUE                VALUE
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                            
Principal Financial Group            Guaranteed Interest Accounts:
                                        Maturing December 31, 2001                                                $   134,829
                                        Maturing December 31, 2002                                                    143,973
                                        Maturing December 31, 2003                                                    141,126
                                        Maturing December 31, 2005                                                      7,898

Principal Financial Group            Pooled Separate Accounts:
                                        51,894.9590 shares - Principal Stable Value Account                           682,672
                                        446.9927 shares - Principal Bond and Mortgage Account                         265,531
                                        23,026.5959 shares - Principal Stock Emphasis Balanced Account                457,890
                                        12,849.6423 shares - Principal Large Cap Stock Index Account                  526,196
                                        3,768.2836 shares - Principal International Stock Account                     109,682
                                        34,566.6728 shares - Principal Small Company Blend Account                  1,552,519
                                        84,993.9446 shares - Principal Large Company Blend Account                  1,589,459
                                        41,768.3603 shares - Principal Small Company Growth Account                   741,286
                                        49,547.8724 shares - Principal Medium Company Growth Account                  903,345
                                        47,561.1310 shares - Principal Large Company Growth Account                   949,809

Bank Mutual Corporation*             210,609 shares - Common stock                                                  3,218,106

Participant Loans                    8.0% to 10.35% notes maturing over the next three years                           45,427
- ------------------------------------------------------------------------------------------------------------------------------

                                     Total assets held for investment purposes                                    $11,469,748
==============================================================================================================================



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

*    Represents a party-in-interest.

See Independent Auditor's Report.                                             11