SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C.  20549
                                     
                                 FORM 10-K
(Mark One)

     X         Annual Report Pursuant to Section 13 or 15(d)
                      of the Securities Exchange Act
                          of 1934 (No Fee Required)

                For the fiscal year ended December 31, 1996

                                    or

               Transition Report Pursuant to Section 13 or 15(d)
                      of the Securities Exchange Act
                         of 1934 (No Fee Required)

         For the Transition Period From __________ to __________.

                     Commission file number 0-10537                        
                                     
                                     
                          Old Second Bancorp, Inc.
          (Exact name of Registrant as specified in its charter)

       Delaware                         36-3143493
(State of Incorporation)          (I.R.S. Employer I.D. No.)

              37 South River Street, Aurora, Illinois  60507
            (Address of principal executive offices) (Zip Code)

                              (630) 892-0202
           (Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: Yes

Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act
of 1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days.

                            Yes   X   No       

Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained,
to the best of Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.
                      Yes    X    No      

State the aggregate market value of the voting stock held by non-affiliates
of the Registrant.  The aggregate market value shall be computed by
reference to the price at which the stock was sold, or the average bid and
asked prices of such stock, as of a specified date within 60 days prior to
the date of filing:

                   $127,046,183 as of February 28, 1997

Indicate the number of shares outstanding of each of the registrant's 
classes of common stock, as of the latest practicable date.

2,937,484 shares of No par value common stock at February 28, 1997.

                    DOCUMENTS INCORPORATED BY REFERENCE

Portions of the December 31, 1996 Annual Report to Stockholders and the
Registrant's Proxy Statement dated February 10, 1997, have been
incorporated by reference in Parts I, II and III of the Annual Report on
Form 10-K, to the extent indicated herein.

Index to Exhibits is in Part IV on pages 21 and 22.
This Form 10-K consists of 81 pages.


                                Page 1      
                                                                  


                                     
                                Part I

Item 1.  Business

OLD SECOND BANCORP, INC.

     Old Second Bancorp, Inc. ("Bancorp") was organized on 
September 8, 1981 by the directors of The Old Second National Bank of
Aurora ("Old Second").  Bancorp was incorporated under the laws of the
State of Delaware on September 18, 1981.

     Bancorp is a multi-bank holding company which at December 31, 1996,
had seven subsidiary banks, as follows:  The Old Second National Bank of
Aurora, The Old Second Community Bank of North Aurora, The Old Second
Community Bank of Aurora, The Yorkville National Bank, Burlington Bank,
Kane County Bank and Trust and Bank of Sugar Grove.

     The directors of Bancorp are the same as the directors of Old Second. 
The directors receive no fees for Bancorp meetings.  Bancorp has no
salaried employees.  The officers of Bancorp are also officers of Old
Second.

     Bancorp derives its income principally through the lending and
investing activities of its subsidiaries.

Executive Officers of the Registrant

     Shown below are the names and ages of the executive officers of
Bancorp with an indication of all positions and offices held with Bancorp:


                                        Old Second Bancorp,
Name                     Age            Inc. Offices (1)   
                                        
James E. Benson          66             Chairman, Chief Executive
                                        Officer, and Director

R. J. Carlson            61             President, Chief Operating
                                        Officer, Chief Financial 
                                        Officer, Secretary and 
                                        Director

William B. Skoglund      46             Vice President, Assistant
                                        Secretary and Director

George Starmann III      53             Vice President and
                                        Director  
<FN>
<F1>
(1)  Offices with Bancorp have been held since the formation of Bancorp in
1981, with the following exceptions:  James E. Benson was appointed
Chairman in 1992.  R. J. Carlson was promoted from Vice-President to
President in 1992 and was elected to the Board of Directors in January of
1987.  William B. Skoglund was appointed as an officer and elected as a
director in March of 1992.  George Starmann III was appointed as Vice-
President in 1994 and elected as a director in March 1995.  Officers are 
appointed annually by the Board of Directors.  
</FN>

                                   Page 2




OLD SECOND BANCORP SUBSIDIARIES

     The Old Second National Bank of Aurora is located at 37 South River
Street, Aurora, Illinois.  Old Second is the successor to a bank that was
founded in 1871, and is incorporated under the laws of the United States. 
Old Second offers complete banking and trust services for retail,
commercial, industrial, and public entity customers in Aurora and the
surrounding area.  Services include loans to all customer segments,
checking, savings and time deposits; lock box service and safe deposit
boxes; trust and other fiduciary services to commercial customers and
individuals and other customer services.  Non-FDIC insured mutual funds,
stocks, bonds, securities and annuities are provided by LPL Financial
Services, Inc., a registered broker/dealer and member NASD, SIPC.  Old
Second has two offsite Automatic Teller Machines, and its customers can use
certain other financial institutions' offsite teller machines to complete
deposit, withdrawal, transfer, and other banking transactions.  Old Second
is subject to vigorous competition from other banks and many savings and
loan associations, as well as credit unions and other financial
institutions.  Within the Aurora banking market, which is approximated by
the southern two-thirds of Kane County and the northern one-third of
Kendall County, there are in excess of 20 other banks.
   
     Old Second has full-service branches located at:  1991 West Wilson
Street, Batavia;  4080 Fox Valley Center Drive, Aurora; 555 Redwood Drive,
Aurora. Another full-service banking facility, located in Oswego, Illinois,
is to be opened in the early part of 1997.  Old Second has trust offices at
37 South River Street in Aurora, Illinois, 321 James Street in Geneva,
Illinois and 111 North Main Street in Elburn, Illinois.  

     At December 31, 1996, Old Second had 193 full-time employees,
including 57 officers, and 72 part-time employees.

     The Old Second Community Bank of North Aurora is located at 200 West
John Street, North Aurora, Illinois.  The Old Second Community Bank of
Aurora is located at 1350 North Farnsworth Avenue, Aurora, Illinois. 
Yorkville National Bank is located at 102 East Van Emmon Street, Yorkville,
Illinois, with a branch located at 408 East Countryside Parkway, Yorkville. 
In 1996, Yorkville opened a branch in the Super Wal-Mart in Plano, Illinois
and acquired the Ottawa Banking Center located in Ottawa, Illinois.
Burlington Bank is located at 194 South Main Street, Burlington, Illinois.
Kane County Bank and Trust Company is located at 122 North Main Street,
Elburn, Illinois, with a branch facility located at 40W422 Route 64 in
Wasco, Illinois.  Bank of Sugar Grove is located on Cross Street at
Illinois Route 47, Sugar Grove, Illinois.

                                   






                                    Page 3




     These Banks offer banking services for retail, commercial, industrial,
and public entity customers in the Aurora, Batavia, Oswego, North Aurora,
Yorkville, Plano, Ottawa, Burlington, Elburn, Wasco and Sugar Grove
communities and surrounding areas.  Services include loans to all customer
segments, checking, savings and time deposits, and other customer services. 
With the exception of Yorkville's main banking facility, these Banks have
onsite 24 hour Automatic Teller Machines, whereas Yorkville has one offsite
Automated Teller Machine.  Their customers can use certain other financial
institutions' offsite teller machines to complete deposit, withdrawal,
transfer, and other banking transactions as well.

     The banks are subject to vigorous competition from other banks and
many savings and loan associations, as well as credit unions and other
financial institutions in the area.  Within the Yorkville National Bank
banking market, which includes portions of Kane and LaSalle and all of
Kendall counties, there are approximately 16 other banks or banking
facilities and several savings and loan associations.
                                     
     At December 31, 1996, The Old Second Community Bank of North Aurora
had about 22 employees, and The Old Second Community Bank of Aurora had
about 23 employees.  The Yorkville National Bank had about 58 employees,
Burlington Bank had 13 employees, Kane County Bank and Trust had about 26
employees and Bank of Sugar Grove had about 22 employees.

     The only industry segment in which Bancorp and its subsidiaries are
engaged in is banking, and there are no foreign operations.

                                     
                                Page 4



ADDITIONAL STATISTICAL INFORMATION - OLD SECOND BANCORP, INC.

     The following table presents additional statistical information about
Bancorp and its subsidiary banks, their operations and financial condition.

DISTRIBUTION OF ASSETS, LIABILITIES AND STOCKHOLDERS' EQUITY;
          INTEREST RATES AND INTEREST DIFFERENTIAL

AVERAGE BALANCE SHEETS
     The condensed consolidated averages of Bancorp and its subsidiary
banks for the periods indicated are presented below, in thousands of
dollars:


                          Years Ended
                                             December 31,
                                        1996      1995      1994
ASSETS         
                                                  
Cash and due from banks                $31,269    $31,413   $33,903 
Interest bearing deposits 
  with banks                               301        477     1,036
Federal funds sold                      39,356     36,893    29,779        
Total Cash and Cash 
     Equivalents                        70,926     68,783    64,718

Investment securities:
  Taxable                              186,512    187,494   182,437   
  Non taxable                           68,276     70,345    67,423
Loans, net                             403,860    369,765   336,886
Bank premises and equipment, net        14,779     14,160    14,262
Other assets                            13,394     12,217    13,526
                                       -------    -------   -------
     Total Assets                     $757,747   $722,764  $679,252        
                                       =======    =======   =======

LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities:
  Deposits:
    Demands                            $ 94,657  $ 91,889  $ 90,119
    Savings                             275,363   265,632   274,214
    Time                                298,183   284,563   240,842
                                        -------   -------   -------
     Total Deposits                     668,203   642,084   605,175
                                        
Securities sold under agreements
  to repurchase                           3,632     3,688     1,705
Notes payable                                25        45       585
Other short-term borrowings               2,180     3,044     3,069
Other                                     6,248     5,141     4,135
                                        -------   -------   -------
     Total Liabilities                  680,288   654,002   614,669
Stockholders' Equity                     77,459    68,762    64,583
     Total Liabilities and
     Stockholders' Equity              $757,747  $722,764  $679,252
                                        =======   =======   =======   


The average balance sheets were calculated using daily averages.      


                                  Page 5




Analysis of Net Interest Earnings
     The following table shows information regarding average interest-earning
assets and interest-bearing liabilities, by categories and the related
interest income or expense for the periods indicated, in thousands of
dollars:


                                        Years Ended
                                        December 31,
     
AVERAGE BALANCES                   1996       1995      1994
                                              
Interest-earning assets:
Interest bearing deposits
  with banks                       $   301    $   477   $ 1,036
Investment securities:
  Taxable                          186,512    187,494   182,437
  Non taxable                       68,276     70,345    67,423
Federal funds sold                  39,356     36,893    29,779
Loans, net:                        403,860    369,765   336,886
                                   -------    -------   -------
     Total interest-earning
     assets                       $698,305   $664,974  $617,561
                                   =======    =======   =======
Interest-bearing liabilities:
  Savings deposits                $275,363   $265,632  $274,214
  Time deposits                    298,183    284,563   240,842
  Securities sold under            
   agreements to repurchase          3,632      3,688     1,705
  Notes payable                         25         45       585
  Other                              2,180      3,044     3,069
                                   -------    -------   -------
     Total interest-bearing
     liabilities                  $579,383   $556,972  $520,415
                                   =======    =======   =======

Interest earned on earning assets:
Interest bearing deposits
  with banks                      $      22  $     22  $     37
Investment securities:
  Taxable                            12,083    12,161    11,611      
  Non taxable                         3,745     4,013     3,788 
Federal funds sold                    2,093     2,131     1,234   
Loans, net                           36,631    34,239    28,740  
                                     ------    ------    ------
     Total interest earned
     on interest-earning assets   $  54,574  $ 52,566  $ 45,410
                                     ======    ======    ======
Interest paid on liabilities
  Savings deposits                $   7,405  $  7,753  $  7,061  
  Time deposits                      16,960    15,980    11,097
  Securities sold under       
    agreements to repurchase            180       142        49
  Notes payable                           2         4        47
  Other                                 108       190       125
                                     ------    ------    ------
     Total interest paid on
     interest-bearing liabilities $  24,655  $ 24,069 $  18,379  
                                     ======    ======    ======            
                      

                                 Page 6





Average Yields, Average Rates and Net Yields

The following table shows average yields and average rates, by 
type of asset or liability and in total, for the periods indicated
as well as the yield on earning assets:

                               
                                        Years Ended
                                        December 31,
                                  1996       1995      1994
                                                               
Average rates earned:                
Interest bearing deposits
  with banks                       7.31%     4.59%     3.57%
Investment securities:             
    Taxable                        6.48      6.49      6.36
    Non taxable *                  5.49      5.70      5.62
Federal funds sold                 5.32      5.78      4.14 
Loans, net  **                     9.07      9.26      8.53
                                   ----      ----      ----
Average yield on earning assets*   7.82%     7.90%     7.35%
                                   ====      ====      ====

Average rates paid:
  Savings deposits                 2.69      2.92      2.57
  Time deposits                    5.69      5.62      4.61
  Securities sold under 
    agreements to repurchase       4.96      3.84      2.87
  Notes payable                    8.00      8.75      8.03
  Other                            4.95      6.26      4.07
                                   ----      ----      ----
Average rate paid on interest-
  bearing liabilities              4.26%     4.32%     3.53%
                                   ====      ====      ====
Net yield on interest-earning      
  assets*                          4.28%     4.29%     4.38%
                                   ====      ====      ====
<FN>
* Interest income and yield on tax-exempt securities are not                
  reflected in the tables on a tax-equivalent basis. Net yield on    
  interest-earning assets is net interest divided by total average          
  interest-earning assets.

** Principal balances on nonaccruing loans, if any, are included in     
   net loans on the average balance sheets. There were no out-of-     
   period adjustments or foreign activities for any reportable        
   period.
</FN>


Loan fees included in the above interest income computations are as 
follows, in thousands:


                         Years ended December 31,
                                     
                         1996           $731
                         1995           $648
                         1994           $600

                                 Page 7




Changes in Interest Income and Expense

The following table shows the dollar amount of changes in interest income
and expense, by major categories of assets and liabilities, attributable 
to changes in volume or rate or both, for the periods indicated, in 
thousands of dollars:


                                       1996 Compared to 1995
                                  Increase (Decrease) Due To 
Interest income:                    Volume (1)   Rate(1)    Net    
 Interest bearing deposits                                      
    with banks                       $  (13)  $    13  $      0            
 Investment securities: 
    Taxable                             (64)      (14)      (78)
    Non taxable                        (113)     (155)     (268)
  Federal funds sold                    131      (169)      (38)
  Loans, net                          3,092      (700)    2,392        
                                      -----     -----     -----
Net increase (decrease)             $ 3,033   $(1,025)  $ 2,008 

Interest expense:
  Savings deposits                  $   262   $  (610)  $  (348)      
  Time deposits                         775       205       980
  Securities sold under agreements  
    to repurchase                        (3)       41        38
  Notes payable                          (2)        0        (2)
  Other                                 (43)      (39)      (82)     
                                      -----       ---     -----
Net increase (decrease)             $   989   $  (403)  $   586 
Increase (decrease)                   -----       ---     -----
  in net interest margin            $ 2,044   $  (622)  $ 1,422  
                                      -----       ---     -----

                                        1995 Compared to 1994 
                                  Increase (Decrease) Due To
Interest income:                    Volume (1)   Rate(1)    Net
 Interest bearing deposits                       
    with banks                      $   (26)   $    11  $   (15) 
 Investment securities:
    Taxable                             328        222      550 
    Non taxable                         167         58      225       
 Federal funds sold                     411        486      897
 Loans, net                           3,044      2,455    5,499         
                                      -----      -----    -----
 Net increase                       $ 3,924    $ 3,232  $ 7,156
                                      -----      -----    -----  
Interest expense:
 Savings deposits                   $  (250)   $   942  $   692 
 Time deposits                        2,455      2,428    4,883
 Securities sold under agreements
    to repurchase                        76         17       93 
  Notes payable                         (45)         2      (43)    
  Other                                  (2)        67       65     
                                      -----      -----    -----
Net increase                          2,234      3,456    5,690       
                                      -----      -----    -----
Increase (decrease)                  
  in net interest margin            $ 1,690    $  (224) $ 1,466
                                      -----        ---    -----


1) The change in interest due to both rate and volume has been allocated
to change due to volume and change due to rate in proportion to the
the relationship of the absolute dollar amounts of the change in each.

                                    Page 8



                    Interest Rate Repricing Gaps

The management of interest rate sensitivity is accomplished by monitoring the
maturities and repricing opportunities of interest-earning assets and
interest-bearing liabilities. Amounts are positioned into rate maturity
periods based upon contractual or historical experience of frequency of
repricing the respective assets and liabilities. The following table
summarizes the interest rate repricing gaps for selected maturity periods as
of December 31, 1996:


OLD SECOND BANCORP, INC. 
(In thousands)                      Rate Maturity Period         
                            0-90     91-180     181-365    Over 1
                           Days       Days       Days       Year     Total
                                                        
INTEREST-EARNING ASSETS:   
Interest-earning 
 deposits                $    200                                  $     200
Federal funds sold         40,175                                     40,175
Investment securities      43,507   $  6,570    $  13,970  $212,560  276,607
Loans, net                161,802     28,576       39,220   209,991  439,589
                          -------     ------       ------   -------  -------
Total interest-earning
 assets                  $245,684   $ 35,146    $  53,190  $422,551 $756,571
                          =======     ======       ======   =======  =======
INTEREST-BEARING 
LIABILITIES:
Money market, savings 
 and NOW accounts       $ 187,233                          $107,272 $294,505 
   Time deposits           84,420  $  52,343   $  38,006    151,866  326,635
Other borrowed funds        5,983        276                           6,259
                          -------     ------      ------    -------  -------
Total interest-
 bearing liabilities    $ 277,636  $  52,619   $  38,006   $259,138 $627,399
                          -------     ------      ------    -------  -------
Period gap              $( 31,952) $ (17,473)  $  15,184   $163,413 $129,172
                           ------     ------      ------    -------  -------
Cumulative gap          $( 31,952) $( 49,425)  $( 34,241)  $129,172
                           ------     ------      ------    -------                          


Total interest-earning assets exceeded interest-bearing liabilities by
$129,172,000 at December 31, 1996.  This difference was funded through
noninterest-bearing liabilities and stockholders' equity. The above table
shows that total interest-bearing liabilities maturing or repricing within
one year exceed interest-earning assets maturing or repricing by $34,241,000.
Theoretically, in a period of rising interest rates, it is preferable to have
a positive gap (interest-earning assets in excess of interest-bearing
liabilities) because more interest-earning assets should mature or reprice
within a given time period than interest-bearing liabilities to increase
interest income in excess of the increase in interest expense. Conversely,
theoretically, in a period of declining interest rates, it is preferable to
be in a negative gap position (interest-bearing liabilities in excess of
interest-earning assets) because more interest-bearing liabilities should
mature or reprice to lower interest expense in excess of the decline in
interest income. Because assets and liabilities do not reprice in exactly the
same manner as interest levels change, the above table should not be viewed
as a sole indicator of how the Bancorp will be affected by changes in
interest rates.   
                                   Page 9



 
                           INVESTMENT PORTFOLIO


   The required information for book value and maturities of investment
securities appears in Note D  of the Annual Report to Stockholders and is
incorporated by reference in this Annual Report on Form 10-K.


Weighted Average Yield of Investment Securities

  The weighted average yield for each range of maturities of investment
securities is shown below as of December 31, 1996:




                                   Maturing                                 
                     Within  From 1 To  From 5 To  After
                     1 Year   5 Years   10 Years  10 Years  
                                        
U.S. Government 
  and agency 
  obligations         5.75%     6.34%     6.78%     6.22%    
States & political
  subdivisions        6.31      5.95      5.25      6.33
Collateralized
  mortgage oblig.     5.26      4.89      
Other                                               7.64      
 


Note:  Yields on tax-exempt obligations are not computed on a tax
equivalent basis.


                               Page 10

 

                              LOAN PORTFOLIO

Classification of Loans 

The following table shows the classification of loans in thousands of
dollars, on the dates indicated:



                                  December 31, 

                     1996      1995     1994     1993     1992      
                                                 
Commercial,
 financial, and 
 agricultural    $129,678  $124,607  $126,788  $120,734  $105,284  
Real estate-
 construction      34,600    28,998    25,486    21,345    19,284
Real estate-
 mortgage         234,985   202,564   161,270   159,370   155,121
Installment        47,119    43,336    43,475    35,804    37,604
                  -------   -------   -------   -------   -------   
 Total           $446,382  $399,505  $357,019  $337,253  $317,293
                  =======   =======   =======   =======   =======

 

The following table shows the percentage of total loans represented by each
classification of loans on the dates indicated:



                              December 31,
                     1996      1995     1994     1993     1992    
                                                  
Commercial,
  financial, and       
  agricultural        29.0%     31.2%    35.5%    35.8%    33.2%
Real estate-
  construction         7.8       7.3      7.1      6.3      6.1
Real estate-
  mortgage            52.6      50.7     45.2     47.3     48.9  
                      ----      ----     ----     ----     ----
Installment           10.6      10.8     12.2     10.6     11.8
                     -----     -----    -----    -----    -----  
   Total             100.0%    100.0%   100.0%   100.0%   100.0%            
                     =====     =====    =====    =====    =====
    


                                Page 11





                        LOAN PORTFOLIO (continued)


Maturities of Loans and Sensitivity to Changes in Interest Rates

The following table is a summary of maturities of loans by certain
categories at December 31, 1996 in thousands of dollars:


                              
                                      Due
                                      after    
                             Due in 1  1 year    
                              year or  through  Due after                    
                             less     5 years   5 years   Total 
                                                     
Commercial, financial,      
  and agricultural          $75,760   $42,975  $10,943  $129,678
Real estate construction     26,891     7,709             34,600



  Commercial, financial, and agricultural loans due after one year in the
amount of $27,306,000 at December 31, 1996 have floating or adjustable
interest rates.  Such loans with fixed rates totaled $26,612,000.  Real
estate construction loans due after one year in the amount of $4,924,000
have floating or adjustable interest rates.  Such loans with fixed rates
totaled $2,785,000.  Floating or adjustable interest rate loans are those
on which the interest rate can be adjusted to changes in the prime rate or
other rate changes.  Fixed rate loans are those on which the interest rate
cannot be changed for the term of the loan.


                                   Page 12



Risk Elements        

    Nonaccrual, past due and restructured loans include, respectively,
loans on which no interest is currently being accrued, accruing loans 
which are past due 90 days or more as to principal or interest 
payments, and loans neither in nonaccrual status nor 90 day delinquent
status on which the terms of maturity or interest rate have been
renegotiated to provide a reduction or deferral of interest or 
principal payments due to a deterioration in the financial position 
of the borrower. It is management's general policy to discontinue the
accrual of interest on a loan when it is past due 90 days with regard 
to either interest or principal payments.  At any given date,  
Bancorp's subsidiaries may have various loans outstanding, which are
accruing interest, are not contractually past due more than 90 days, 
and are not renegotiated, but which, in management's opinion, may not 
be repaid according to original terms; these are shown below as 
"potential loan problems".  Management periodically reviews these 
accounts which are currently in its portfolio and is of the opinion 
that, although some restructuring of loan terms may be required, no
material loss of principal will occur.
    
    The following is a summary of loans described above at the dates
indicated, in thousands of dollars:


                                             December 31,
                                 1996     1995     1994    1993   1992
                                                      
    Nonaccrual, past due and
      restructured loans
         a) Nonaccrual         $2,342   $3,763   $2,167  $4,428 $3,816      
         b) Past Due              261       56      521     473    998      
         c) Restructured            0       58       69      86    230
   
    Potential Loan Problems(1)  7,334    5,198    4,389   2,188  8,969    
<FN>
<F1>
(1)Loans in this category represent those which have been periodically
delinquent as to the payment of principal and interest and are vulnerable to
current adverse economic conditions. The collateral position ofBancorp's
subsidiaries on these loans mitigates the amount of loss exposure when viewed
in their entirety. There were no foreign outstandings or loan concentrations
at the dates indicated. Amounts for Potential Loan Problems for 1993 and 1992
have not been restated for the inclusion of Bank of Sugar Grove.
</FN>

    Following is information regarding interest income for the year ended
December 31, 1996 for domestic loans which are on a nonaccrual basis or
restructured as of December 31, 1996, in thousands of dollars:

          Gross interest income that would have been 
          included in income for 1996 if the loans  
          had been current in accordance with their
          original terms                                   $296     

          Gross interest income included in income on       
          these loans for 1996                             $ 45

                                 Page 13

                                     
                      SUMMARY OF LOAN LOSS EXPERIENCE

Loan loss experience for the indicated periods in thousands of dollars is   
    summarized as follows:

   
                                             Years Ended December 31,
                            1996      1995     1994      1993      1992
                                                          
Average loans net of  
unearned income              $409,453  $375,459  $341,739  $319,949  $304,247
                              =======   =======   =======   =======   =======

Allowance for possible loan
losses:                     

Balance at beginning of
period                      $  5,676  $  5,753  $  4,471  $  4,598  $  3,802

Additions (deductions):
 Allowance of bank 
 acquired                          0         0         0         0       441
 Loans charged off              (355)     (751)     (633)   (2,197)     (946)
 Recoveries                      369       371     1,360       578       581    
                             -------   -------   -------   -------   -------    
  
Net (charge-offs)           
recoveries                        14      (380)      727    (1,619)     (365)

Provision charged to
operating expense                713       303       555     1,492       720    
                             -------   -------   -------   -------   -------  
Balance at end of period    $  6,403  $  5,676  $  5,753  $  4,471  $  4,598
                             =======   =======   =======   =======   =======   

Allowance for possible loan
losses by category:

Commercial, financial and
agricultural                $  3,768  $  3,298  $  3,333  $  2,325  $  2,625
Real estate-construction         170       150       165       100       160
Real estate-mortgage             972       860       825       675       750
Installment                    1,313     1,183     1,190       820       865
Unallocated                      180       185       240       176       218
                             -------   -------   -------   -------   -------   
Total                       $  6,403  $  5,676  $  5,753  $  4,096  $  4,618

Ratio of net (charge-offs) 
recoveries to average loans
outstanding for the period        0  %     (.10)%    .21%     (.51)%    (.12)%  
                              =====      ======   ======    ======    ======




                                             Page 14



                          SUMMARY OF LOAN LOSS EXPERIENCE (continued)

Charge-offs:                

Commercial, financial and
agricultural                $   168   $    455  $   474   $ 1,577   $   710
Real estate-construction                                                   
Real estate-mortgage             78        134       53       438
Installment                     109        162      106       182       236
                             -------   -------   -------   -------   -------
Total charge-offs               355        751      633     2,197       946
                             -------   -------   -------   -------   -------   
                                        
                       
Recoveries:

Commercial, financial and       
agricultural                    304      298        726       342      378
Real estate-construction                                                13
Real estate-mortgage                       1        425       170      124
Installment                      65       72        209        66       66
                             -------   -------   -------   -------   -------    
Total recoveries                369      371      1,360       578      581
                             -------   -------   -------   -------   -------   
Net (charge-offs)
recoveries                  $    14   $ (380)   $   727   $(1,619)   $ (365)
                             =======   =======   =======   =======   =======   



The amount of additions to the allowance for possible loan losses charged to 
operating expense for the periods indicated was based on a variety of factors,
including actual charge-offs during the year, historical loss experience,
industry guidelines and an evaluation of current and prospective economic
conditions in the market area, and a review of the loans currently
outstanding.
                            

                            

                                 Page 15


Average Deposits by Classification

     The following table sets forth the classification of average
deposits for the indicated periods, in thousands of dollars:



                                         Years Ended 
                                         December 31,
                                       
                                   1996      1995      1994 
                                                   
Demand deposits non-interest
   bearing                    $   94,657    91,889    90,119
                      
Interest bearing checking        105,069    99,066    96,909
Savings deposits                 170,294   166,566   177,305
   Time Deposits                 298,183   284,563   240,842
                                 -------   -------   -------
     Total                    $  668,203   642,084   605,175
                                 =======   =======   =======

Average Rates Paid on Interest Bearing Deposits

     The following table sets forth the rates paid on interest
bearing deposits for the periods indicated:



                                         Years Ended 
                                         December 31,
                                       
                                   1996      1995      1994

                                                 
Interest bearing checking          2.22%     2.55%     2.29%
Savings deposits                   2.98      3.14      2.73
Time deposits                      5.69      5.62      4.61
                                   ----      ----      ----
     Total                         4.25%     4.31%     3.53%      
                                   ====      ====      ====


Maturities of Time Deposits of $100,000 or more

    The following table sets forth the maturity of Time Deposits 
of $100,000 or more, in thousands of dollars, at the date indicated:



                                         December 31,     
                                             1996 
                                       
Maturing within 3 months                  $   26,829               
After 3 but within 6 months                   12,366
After 6 but within 12 months                   5,843
After 12 months                               21,828
                                              ------
     Total                                $   66,866
                                              ====== 

                                   
                                           Page 16
                                  

Return on Equity and Assets
   
The following table presents certain ratios relating to equity 
and assets:



                                                  Years Ended
                                                  December 31,                 

                                              1996    1995    1994
                                                          
Return on total average assets               1.27%   1.22%    1.07%

Return on average stockholders' equity      12.43%  12.83%   11.30%  
Dividend payout ratio                       26.34%  24.36%   26.42%
 
Average equity to average assets ratio      10.22%   9.51%    9.51%




                              Page 17

              


Item 2.  Properties

     Except for certain teller machine locations, Old Second Bancorp
subsidiaries own 14 bank locations.  Old Second National Bank leases space for
the Trust office in Geneva.  Yorkville National Bank leases space for a branch
in the new Super Wal-Mart in Plano, Illinois.  

     Old Second's main banking office located at 37 South River Street, Aurora,
Illinois, has a total of approximately 82,000 square feet. The original five
story, 30,000 square foot building was built in 1925, and a two story, 24,000
square foot addition was constructed in 1982.  A 28,000 square foot building
adjacent to the main bank is used for a ten lane drive-up bank facility and
banking offices.  Parking facilities are provided for approximately one hundred
cars.  Old Second leases to others about 13,700 square feet of building space
and utilizes the remainder for its own operations. 

Item 3.  Legal Proceedings

     In the normal course of business, Old Second Bancorp, Inc. and its
subsidiary Banks are party to several legal proceedings, none of which are
expected to have a materially adverse effect on its financial condition.

       
Item 4.  Submission of Matters to a Vote of Security Holders.

    No matters were submitted to a vote of stockholders during the fourth
quarter of fiscal 1996.




                               Page 18





                                     Part II

Item 5. Market for Registrant's Common Equity and Related 
        Stockholder Matters

     The Common Stock of Bancorp, has been traded in the over-the-counter
market on the NASDAQ National Market System under the symbol OSBC since
November 11, 1993.  Prior to that date, there was no established public trading
market for Bancorp's Common Stock.  However, the stock was quoted on the over-
the-counter market even though there was relatively little trading activity in
the stock.  Information regarding the number of stockholders and market price
for Bancorp's Common Stock for 1996 and 1995 appears on page 25 of the Annual
Report to Stockholders and is incorporated by reference in this Annual Report
on Form 10-K.

     Information regarding dividends declared on the Common Stock of Bancorp is
described in the Capital and Dividends' portion of Management's Discussion on
page 6 of the Annual Report to Stockholders and is incorporated by reference in
this Annual Report on Form 10-K.

     Information regarding dividend restrictions regarding  Bancorp is
described in Note M on page 19 of the Annual Report to Stockholders and is
incorporated by reference in this Annual Report on Form 10-K.
  

Item 6.  Selected Financial Data

     "Selected Consolidated Financial Data" for the five years ended December
31, 1996 appears on page 7 of the Annual Report to Stockholders and is
incorporated by reference in this Annual Report on Form 10-K.


Item 7.  Management's Discussion and Analysis of Financial 
         Condition and Results of Operations

     "Management's Discussion and Analysis of Financial Condition and Results
of Operations" appears on pages 4 through 6 of the Annual Report to
Stockholders and is incorporated by reference in this Annual Report on Form
10-K.


Item 8.  Financial Statements and Supplementary Data

     The Consolidated Financial Statements and Related Notes, and the report
thereon of Ernst & Young LLP dated January 16, 1997, appear on pages 8 through
24 of the Annual Report to Stockholders and are incorporated by reference in
this Annual Report on Form 10-K.


Item 9.  Changes in and Disagreements with Accountants on Accounting and
Financial Disclosure 

     None.

                                        

                                        
                                Page 19




                                    Part III


Item 10.  Directors and Executive Officers of the Registrant

     The required information for directors of the Registrant is shown on pages
5 through 8, under "Election of Directors" in the Registrant's Proxy Statement
and is incorporated by reference in this Annual Report on Form 10-K.  The
required information for executive officers of the Registrant is included in
Part I of this Form 10-K.


Item 11.  Executive Compensation

     The required information for executive compensation of the Registrant is
shown on pages 9 through 15 under "Executive Compensation" in the Registrant's
Proxy Statement and is incorporated by reference in the Annual Report on Form
10-K.


Item 12.  Security Ownership of Certain Beneficial Owners and
          Management 

     The required information for security ownership of certain beneficial
owners and management of the registrant is shown on pages 3 and 4 under "Voting
Securities and Principal Holders Thereof" in the Registrant's Proxy Statement
and is incorporated by reference in this Annual Report on Form 10-K.


Item 13. Certain Relationships and Related Transactions

     The required information for Certain Relationships and Related
Transactions is shown on page 18 in the Registrant's Proxy Statement and is
incorporated by reference in this Annual Report on Form 10-K.



                              Page 20






                                     Part IV

Item 14.  Exhibits, Financial Statement Schedules, and Reports on          
          Form 8-K.


(a)(1) Financial Statements                      Reference                      
                                        Form 10-K      Annual Report
     Incorporated by reference in Part  Annual Report  to Stockholders
     II, Item 8 of this report:             (page)         (page)     
                                                            
     Consolidated Balance Sheets as of
     December 31, 1996 and 1995                34               8

     Consolidated Statements of Income
     for the years ended December 31,
     1996, 1995, and 1994                      35               9

     Consolidated Statements of Cash Flows
     for the years ended December 31, 
     1996, 1995, and 1994                      36               10

     Consolidated Statements of Changes
     in Stockholders' Equity for the
     years ended December 31, 1996, 
     1995, and 1994                            37               11

     Notes to Consolidated Financial 
     Statements                             38-49            12-23

     Report of Independent Accountants         50               24

(2) Financial Statement Schedules

     No schedules are included as they are not required.

(3) Exhibits

     The Registrant hereby incorporates
     by reference its By-Laws as filed
     as exhibits to its Registration Statement
     on Form S-14 (File No.2-75588) which was filed
     with the Securities and Exchange Commission on
     January 22, 1982.


                                 Page 21       



     
(a)(3) Exhibits (Continued)                        Reference                    
                                       Form 10-K      Annual Report
                                           Annual Report  to Stockholders
                                               (page)        (page)       
                                

13.1  Old Second Bancorp, Inc. - 1996 Annual
      Report to Stockholders is furnished for
      the information of the Commission and is
      not deemed to be "filed as a part of this
      10-K," except for portions incorporated
      herein.                                   26-55  

22.1  Subsidiaries of the Registrant               56    

23.1  Consents of Independent Accountants       57-58

25.1  Audit Opinion of Independent Accountant      59

27.1  Financial Data Schedule                      60

99.1  Old Second Bancorp, Inc. 1997 Proxy
      Statement                                 61-80




      Other exhibits are omitted because of the absence of conditions   
under which they are required.

(b)   Reports on Form 8-K: 

      There were no Form 8-K reports filed during the fourth quarter
of 1996.



                         

                                  
                                Page 22





                                   SIGNATURES


Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
act of 1934, the Registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.


                                       OLD SECOND BANCORP, INC.
                                           (Registrant)




Date  March 27, 1997               By /s/ James E. Benson          
                                
                                      James E. Benson- Chairman,
                                      Chief Executive Officer, 
                                      and Director






Date  March 28, 1997               By /s/ Ronald J. Carlson      
                                      Ronald J. Carlson - 
                                      President, Chief Financial
                                      Officer, Secretary and Director
     



                                  Page 23
                                  




                              SIGNATURES, Continued

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

          Date                          SIGNATURE AND TITLE

                                                               

                                   Walter Alexander - Director


March 27, 1997                     /s/ James E. Benson 
                                                               
                                   James E. Benson - Chairman
                                   Chief Executive Officer,                
                                   and Director

March 28, 1997                     /s/ Ronald J. Carlson
                                                                                
                                   Ronald J. Carlson-President, 
                                   Chief Financial Officer,                     
                                   Secretary and Director


                                                                                
                                   Marvin Fagel - Director


                                                               
                                   Joanne Hansen - Director


March 27, 1997                     /s/ Kenneth F. Lindgren
                                                               
                                   Kenneth F. Lindgren - Director


March 27, 1997                     /s/ Jesse Maberry
                                                                                
                                   Jesse Maberry - Director


                                                                
                                   Gary McCarter - Director






                             Page 24





                           SIGNATURES, continued


          Date                          SIGNATURE AND TITLE



                                                               
                                    D. Chet McKee - Director


March 27, 1997                      /s/ William J. Meyer
                                                                                
                                    William J. Meyer - Director


March 27, 1997                      /s/ Alan J. Rassi
                                                                                
                                    Alan J. Rassi - Director


                                                               
                                    Larry A. Schuster - Director


March 27, 1997                      /s/ William B. Skoglund
                                                               
                                    William B. Skoglund - 
                                    Vice President, Assistant                   
                                    Secretary, and Director


March 27, 1997                      /s/ George Starmann III
                                                               
                                    George Starmann III
                                    Vice President and Director



                                     Page 25