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, 1997
                                   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:

                       $189,049,780 as of March 12, 1998

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

3,049,190 shares of No par value common stock at March 12, 1998.

                  DOCUMENTS INCORPORATED BY REFERENCE

Portions of the December 31, 1997 Annual Report to Stockholders and the 
Registrant's Proxy Statement dated February 11, 1998, 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 17 and 18.
This Form 10-K consists of 61 pages.

                            Page 1      


                            FORM 10-K
                        TABLE OF CONTENTS

                            Part I

Item 1.   Business                                                3 
Item 2.   Properties                                             14 
Item 3.   Legal Proceedings                                      14
Item 4.   Submission of Matters to a Vote of Security Holders    14


                            Part II

Item 5.   Market for the Registrant's Common Equity and Related  
          Stockholder Matters                                    15
Item 6.   Selected Financial Data                                15
Item 7.   Management's Discussion and Analysis of Financial      
          Condition and Results of Operations                    15
Item 7a.  Quantitative and Qualitative Disclosures about 
          Market Risk                                            15
Item 8.   Financial Statements and Supplementary Data            15
Item 9.   Changes in and Disagreements with Accountants on 
          Accounting and Financial Disclosure                    15

                            Part III

Item 10.  Directors and Executive Officers of the Registrant     16
Item 11.  Executive Compensation                                 16
Item 12.  Security Ownership of Certain Beneficial Owners and
          Management                                             16
Item 13.  Certain Relationships and Related Transactions         16

                            Part IV

Item 14.  Exhibits, Financial Statement Schedules and 
          Reports on Form 8-K                                    17



                               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 principally engaged in the business of 
attracting deposits and investing these funds, together with borrowings and 
other funds, to primarily originate commercial, real estate and consumer 
loans and purchase investment securities. At December 31, 1997, Bancorp 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.  In addition, Bancorp has a mortgage banking 
subsidiary principally engaged in the business of originating, purchasing, 
selling and servicing residential mortgage loans.  

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.

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          67            Chairman, Chief Executive               
                                       Officer, and Director

R. J. Carlson            62            President, Chief Operating
                                       Officer, Chief Financial 
                                       Officer, Secretary and Director

William B. Skoglund      47            Vice President, Assistant
                                       Secretary and Director

George Starmann III      54            Vice President and
                                       Director  


<FN>
(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.  


                               Page 3


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 has full-service branches located at:  1991 West Wilson Street, 
Batavia;  4080 Fox Valley Center Drive, Aurora; 555 Redwood Drive, Aurora; 
1200 Douglas Road, Oswego, which opened in April of 1997; 1100 South County 
Line Road, Maple Park, and 2S101 Harter Road, Kaneville, both of which were 
acquired in June of 1997.  Old Second has trust offices at 37 South River 
Street in Aurora, 321 James Street in Geneva, and 122 North Main Street in 
Elburn. 

The Old Second Community Bank of North Aurora is located at 200 West John 
Street, North Aurora.  The Old Second Community Bank of Aurora is 
located at 1350 North Farnsworth Avenue, Aurora.  Yorkville 
National Bank is located at 102 East Van Emmon Street, Yorkville, with 
branches located at 408 East Countryside Parkway in Yorkville, 6800 West
Route 64 in Plano and 323 East Norris Drive in Ottawa.  Burlington Bank is 
located at 194 South Main Street in Burlington. Kane County Bank 
and Trust Company is located at 749 North Main Street in Elburn, 
with branches at 122 North Main Street in Elburn and 40W422 Route 64 in 
Wasco.  Bank of Sugar Grove is located on Cross Street at Illinois 
Route 47, Sugar Grove.

These Banks offer banking services for retail, commercial, industrial, and 
public entity customers in the Aurora, Batavia, Oswego, Maple Park, 
Kaneville, 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 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. Within the 
Yorkville National Bank banking market, which includes portions of Kane and 
LaSalle and all of Kendall counties, there are approximately 10 other banks 
or banking facilities and several savings and loan associations.
                                   
At December 31, 1997, Bancorp and its subsidiaries had 396 full-time and 125 
part-time employess. 

The only industry segment in which Bancorp and its subsidiaries are engaged 
in is banking, and there are no foreign operations.  Maple Park Mortgage 
("Maple Park") operates from leased offices in St. Charles, Sycamore, Oswego 
and Bannockburn, Illinois.  The main office is located at 1450 West Main 
Street in St. Charles.  Since 1992, Maple Park has developed a wholesale 
(correspondent) division primarily engaged in soliciting mortgage loans in 
Iowa, Colorado, Wyoming and Illinois.  The wholesale division emphasizes 
developing relationships with financial institutions.  Maple Park currently 
holds contracts with over 300 banks and credit unions.  Maple Park operates 
as a mortgage broker and servicer offering a wide range of products including 
conventional, fixed and adjustable-rate mortgages.  The New Leaf division 
of Maple Park is located in St. Charles and specializes in assisting 
prospective and current homeowners who do not qualify in the traditional 
market to obtain mortgages.  Maple Park currently has 57 full-time
employess and 2 part-time employees.

Maple Park faces vigorous competition in all phases of its retail and 
correspondent divisions.  Maple Park believes that competition for its retail
products is principally based on location, convenience, quality and price.
Within its retail mortgage banking market, there are approximately six large
companies offering mortgage banking products and services and a number of 
small or mid-sized brokerage operations.  Maple Park believes that 
competition for its correspondent division is primarily based on convenience, 
quality and price.  There are several large national companies competing in 
their correspondent markets.


                               Page 4

                                  
ADDITIONAL  STATISTICAL INFORMATION - OLD SECOND BANCORP, INC.                  
CONSOLIDATED DAILY AVERAGE BALANCE SHEETS AND INTEREST RATES


                                   Years Ended December 31,
                  1997                       1996                   1995 
                 ____________________________________________________________
                 Avg   Income   Yield Avg  Income   Yield  Avg  Income  Yield 
                 Bal   Expense  Rate  Bal  Expense  Rate   Bal  Expense Rate
                 ____________________________________________________________ 
ASSETS                                            
                                              
Interest bearing 
 deposits with 
 banks             298     22 7.38%     301     22 7.31%     477     22 4.61%
Federal funds 
 sold           43,803  2,407 5.50%  41,377  2,227 5.38%  39,329  2,274 5.78%
Investment 
 securities:                                           
Taxable        204,352 13,025 6.37% 196,791 12,723 6.47% 195,798 12,537 6.40%
Non taxable (1) 61,830  3,302 5.34%  68,276  3,755 5.50%  70,345  4,118 5.85%
Loans held for
 sale and net
 loans (2)     515,016 46,422 9.01% 448,422 40,959 9.13% 427,744 39,288 9.18%
               ------- ------ ----  ------- ------ ----  ------- ------ ----
Total interest 
 earning 
 assets (1)    825,299 65,178 7.90% 755,167 59,686 7.90% 733,693 58,239 7.94%
               ======= ====== ====  ======= ====== ====  ======= ====== ====
Cash and due 
 from banks     34,513               33,329               33,026    
Bank premises 
 and equipment, 
 net            20,514               18,833               17,753             
Other assets    21,034               19,267               23,453
                ------               ------               ------         
Total assets   901,360              826,596              807,925       
               =======              =======              =======        
LIABILITIES AND STOCKHOLDERS' EQUITY                                            
Interest bearing
 transaction 
 deposits      111,170  2,194  1.97% 108,091  2,361 2.18% 102,168  2,399 2.35%
Savings 
 deposits      185,304  5,726  3.09% 179,103  5,374 3.00% 176,977  5,776 3.26%
Time deposits  373,433 21,672  5.80% 339,529 19,512 5.75% 319,255 18,071 5.66%
               ------- ------  ----- ------- ------ ----  ------- ------ ----
Total deposits 669,907 29,592  4.42% 626,723 27,247 4.35% 598,400 26,246 4.39%
Securities sold 
 under agreements 
 to repurchase  13,958    690  4.94%   3,632    181 4.98%   3,688    142 3.85%
Notes payable    8,991    589  6.55%   2,377    221 9.30%   9,970    650 6.52%
Other short-term 
borrowings       3,415    180  5.27%   2,724    138 5.07%   4,555    284 6.23%
                 -----    ---  ----    -----    --- ----    -----    --- ----
Total interest
 bearing 
 liabilities   696,271 31,051  4.46% 635,456 27,787 4.37% 616,613 27,322 4.43%
               ======= ======  ====  ======= ====== ====  ======= ====== ====   
Demand 
 deposits      109,219               102,738              109,718
Other 
 liabilities     9,014                 6,951                8,582          
               -------               -------              -------   
Total 
 liabilities   814,504               745,145              734,913       
Stockholders' 
 equity         86,856                81,451               73,012         
               -------               -------              -------    
Total 
 liabilities and
 stockholders' 
 equity        901,360               826,596              807,925           
               =======               =======              =======              
Net interest 
 spread (1)                    3.44%                3.53%                3.51%
                               =====                =====                ====
Net yield on 
 interest earning 
 assets (1)                    4.14%                4.22%                4.21%
                               =====                =====                =====

                                Page 5



(1)  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 income divided by total average interest-earning assets.

(2)  Principal balances on nonaccruing loans, if any, are included in net 
loans on the average balance sheet.  There were no out-of-period adjustments
or foreign activities for any reportable period.

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

                          Years Ended December 31,

                           1997           $719
                           1996           $731
                           1995           $648


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:



                                       1997 Compared to 1996
                                     Increase (Decrease) Due To 
Interest income:                  Volume (1)     Rate(1)      Net    
                               -----------------------------------
                                                   
 Interest bearing deposits                                                 
    with banks                $   0          $    (0)       $   (0)            
 Investment securities: 
    Taxable                     482             (180)          302
    Non taxable                (344)            (109)         (453)
  Federal funds sold            133               47           180
  Loans, net                  5,972             (509)        5,463
                            -------          -------       -------
Net increase (decrease)     $ 6,243          $  (751)      $ 5,492 
                            -------          -------       -------
Interest expense:
  Interest bearing deposits $    61          $ (228)       $  (167)
  Savings deposits              192             160            352
  Time deposits               1,968             192          2,160
  Securities sold under 
    agreements to repurchase    510              (1)           509
  Notes payable                 411             (43)           368
  Other                          36               6             42
                            -------          ------       --------
Net increase                $ 3,178          $   86       $  3,264
Increase (decrease)         -------          ------       --------
 in net interest margin     $ 3,065          $ (837)      $  2,228  
                            -------          ------       --------    

                                  Page 6


                                   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                      65             121           186
    Non taxable                (114)           (249)         (363)       
 Federal funds sold             110            (157)          (47)
 Loans, net                   1,918            (247)        1,671         
                            -------         -------       -------
 Net increase (decrease)    $ 1,966         $  (519)      $ 1,447
                            -------         -------       -------
Interest expense:
 Interest bearing deposits  $   129         $  (167)      $   (38)
 Savings deposits                64            (466)         (402) 
 Time deposits                1,165             276         1,441
 Securities sold under 
    agreements to repurchase     (3)             42            39 
 Notes payable                 (591)            162          (429)    
 Other                          (93)            (53)         (146)      
                            -------         -------       -------
 Net increase (decrease)    $   671         $  (206)      $   465       
                            -------         -------       -------
Increase (decrease)     
  in net interest margin    $ 1,295         $  (313)      $   982  
                            -------         -------       -------

<FN>
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 7



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, 1997:

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                 $   350                                   $   350
Federal funds sold         46,050                                    46,050
Investment securities      24,486   $  7,186   $ 19,754   $213,041  264,467
Loans held for sale        26,927                                    26,927
Loans, net                188,968     27,780     47,176    270,708  534,632
                         --------   --------   --------   --------   -------    
Total interest-earning 
  assets                 $286,781   $ 34,966   $ 66,930   $483,749  $872,426

INTEREST-BEARING
LIABILITIES:
- ------------------
Money market, savings 
  and NOW accounts       $203,902                         $100,755  $304,657
Time deposits             121,080   $ 61,938   $ 77,302    109,188   369,508
Other borrowed funds       53,477      1,629         50               55,156
                         --------   --------   --------   --------  --------    
Total interest- bearing 
  liabilities            $378,459   $ 63,567   $ 77,352   $209,943  $729,321

Period gap              $ (91,678)  $(28,601)  $(10,422)  $273,806  $143,105

Cumulative gap          $ (91,678)  $(120,279) $(130,701) $143,105



Total interest-earning assets exceeded interest-bearing liabilities by 
$143,105,000 at December 31, 1997.  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 
$130,701,000. 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 8
                                  

                        INVESTMENT PORTFOLIO

The required information for book value, market 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, 1997:


                                                   Maturing
                            ----------------------------------------------
                            Within    From 1 To    From 5 To       After
                            1 Year     5 Years     10 Years      10 Years  
                            ----------------------------------------------  
                                                        
U.S. Government and agency 
    obligations               6.17%      6.31%       7.02%         6.48%    
States & political  
    subdivisions              6.17       5.76        5.25          6.30
Collateralized mortgage 
    obligations               5.44       6.21      
Other                                                              6.60      
 

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

                                  
                            LOAN PORTFOLIO

Classification of Loans 

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


                                                December 31, 
                              -------------------------------------------- 
                              1997      1996     1995      1994      1993      
                              --------------------------------------------
                                                        
Commercial, financial, and 
    agricultural            $146,591  $143,961  $141,948  $146,890  $135,555  
Real estate-construction      43,095    40,437    35,653    32,548    25,744
Real estate-mortgage         287,167   248,742   239,081   185,698   181,886
Installment                   58,127    49,164    45,847    45,120    37,134
                            --------  --------   -------   -------  --------
    Total                   $534,980  $482,304  $462,529  $410,256  $380,319
                            ========  ========  ========  ========  ========


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


                                                December 31, 
                               -------------------------------------------
                                 1997   1996     1995    1994      1993      
                               -------------------------------------------
                                                          
Commercial, financial, and       
     agricultural               27.4%   29.8%    30.7%   35.8%     35.6%
Real estate-construction         8.1     8.4      7.7     7.9       6.8
Real estate-mortgage            53.6    51.6     51.7    45.3      47.8  
Installment                     10.9    10.2      9.9    11.0       9.8
                                ----    ----     ----    ----      ----      
     Total                     100.0%  100.0%   100.0%  100.0%    100.0%      
                               =====   =====    =====   =====     =====
    

                               Page 9


                      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, 1997 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              $71,959    $61,519   $13,113   $146,591
Real estate construction         35,043      8,052         0     43,095



Commercial, financial, and agricultural loans due after one year in the 
amount of $80,353,000 at December 31, 1997 have floating or adjustable 
interest rates.  Such loans with fixed rates totaled $66,238,000.  Real 
estate construction loans due after one year in the amount of $29,849,000 
have floating or adjustable interest rates.  Such loans with fixed rates 
totaled $13,246,000.  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 10


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,
                                 --------------------------------------
                                 1997     1996     1995    1994    1993
                                 -------------------------------------- 
                                                       
Nonaccrual, past due and
 restructured loans
   a) Nonaccrual                $2,189   $3,505   $4,514  $2,344  $4,428     
   b) Past Due                   1,011      622      245     555     603      
   c) Restructured                 122        0       58      69      86
   
Potential Loan Problems(1)       6,911    7,334    5,198   4,389   2,188    

<FN>
(1)Loans in this category represent those which have been periodically 
delinquent as to the payment of principal and interest and are vulnerable to
adverse economic conditions.  The collateral position of Bancorp'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.


Following is information regarding interest income for the year ended 
December 31, 1997 for domestic loans which are on a nonaccrual basis or 
restructured as of December 31, 1997, in thousands of dollars:

  Gross interest income that would have been 
  included in income for 1997 if the loans  
  had been current in accordance with their
  original terms                                       $273     

  Gross interest income included in income on       
  these loans for 1997                                 $ 84



                                Page 11


                   SUMMARY OF LOAN LOSS EXPERIENCE

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

                                       Years Ended December 31,
                              -------------------------------------------      
                              1997      1996      1995      1994     1993
                              -------------------------------------------     
                                                      
Average loans held for sale
   and loans net of unearned 
   income                    $521,906  $454,708  $434,403  $389,769  $362,752
                             ========  ========  ========  ========  ========
Allowance for possible 
  loan losses:                     
Balance at beginning of 
  period                    $  6,968  $ 6,686   $  6,370  $  5,110  $  5,230

Additions (deductions):

Charge-offs:
Commercial, financial and
  agricultural              $  1,285  $   615   $  3,299  $  1,701  $  1,577
Real estate-construction          81        0          0         0         0
Real estate-mortgage              67      117        134       130       438
Installment                      209      169        185       108       210 
                             -------   ------    -------   -------   -------
Total charge-offs              1,642      901      3,618     1,939     2,225

Recoveries:
Commercial, financial and
   agricultural                  176      362        431       783       342
Real estate-construction           0        0          0         0         0
Real estate-mortgage             105        0         11       425       170
Installment                       60       73         93       209        74
                              ------    -----     ------    ------   -------
Total recoveries                 341      435        535     1,417       586
                              ------    -----     ------    ------   -------
Net (charge-offs)             (1,301)    (466)    (3,083)     (522)   (1,639)

Provision charged to
   operating expense           1,256      748      3,399     1,782     1,519
                              ------    -----     ------     -----     -----
Balance at the end of period   6,923    6,968      6,686     6,370     5,110
                              ======    =====     ======     =====     =====



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.


Allowance for possible loan
losses by category:
                                                     
Commercial, financial and 
   agricultural             $  4,100  $ 4,100   $  3,990  $  3,730  $  2,985
Real estate-construction         185      185        180       160       115
Real estate-mortgage           1,060    1,060      1,040     1,000       815
Installment                    1,430    1,430      1,248     1,275       995
Unallocated                      148      193        228       205       200
                            --------  -------   --------  --------   -------  
Total                       $  6,923 $  6,968   $  6,686  $  6,370  $  5,110
                            ======== ========   ========  ========  ========
                           
Ratio of net (charge-offs) 
recoveries to average loans
outstanding for the period     (.25)%  (.10)%      (.71)%     (.13)%    (.45)%  
                                ===     ===         ===        ===       ===   


                               Page 12



Maturities of Certificates of Deposit 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,     
                                                  1997 
                                              -----------
                                               
Maturing within 3 months                      $   26,878               
After 3 but within 6 months                        9,516
After 6 but within 12 months                      15,532
After 12 months                                   18,531
                                              ----------- 
     Total                                    $   70,457
                                              =========== 




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


                                                  Years Ended
                                                  December 31,                  
     
                                            1997       1996         1995
                                          --------------------------------
                                                                
Return on total average assets             1.06%        1.01%        1.08%

Return on average stockholders' equity    11.04%       10.24%       11.99%  
Dividend payout ratio                     28.34%       30.40%       24.39%
 
Average equity to average assets ratio     9.64%        9.85%        9.04%




                               Page 13


Item 2.  Properties

Except for certain teller machine locations, Old Second Bancorp subsidiaries
own 18 bank locations.  Old Second National Bank leases space for the Trust
office in Geneva and Yorkville National Bank leases space for a branch in the 
Super Wal-Mart in Plano.  Maple Park Mortgage operates its retail division 
from leased offices in St. Charles, Sycamore, Oswego and Bannockburn.  The 
administrative offices of Maple Park Mortgage are located in St. Charles.
 
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 
subsidiaries 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 1997.



                               Page 14

                                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 1997 and 1996 appears on page 52 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 32 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 P on page 46 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, 
1997 appears on page 32 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 26 through 31 of the Annual Report to 
Stockholders and is incorporated by reference in this Annual Report on 
Form 10-K.

Item 7a.  Quantitative and Qualitative Disclosures about Market Risk

Quantitative and Qualitative disclosures on market risk appears in the 
Management's Discussion and Analysis on page of 29 of the Annual Report to 
Shareholders 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, 1998, appear on pages 33
through 54 of the Annual Report to Stockholders and are incorporated by
reference in this Annaul Report on Form 10-K.

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

     None.

                                   
                               Page 15


                               Part III


Item 10.  Directors and Executive Officers of the Registrant

The required information for directors of the Registrant is shown on pages 4 
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 8 through 14 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 16


                                Part IV


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


(a)(1) Financial Statements                    Reference
       --------------------                  -------------
                                               Form 10-K  
    Incorporated by reference in Part        Annual Report    
     II, Item 8 of this report:                 (page)             
                                                                  
     Consolidated Balance Sheets as of
     December 31, 1997 and 1996                   33                  

     Consolidated Statements of Income
     for the years ended December 31,  
     1997, 1996, and 1995                         34                 

     Consolidated Statements of Cash Flows
     for the years ended December 31, 
     1997, 1996, and 1995                       35-36

     Consolidated Statements of Changes
     in Stockholders' Equity for the
     years ended December 31, 1997, 
     1996, and 1995                               36

     Notes to Consolidated Financial 
     Statements                                 37-51               

     Report of Independent Accountants            52                 

(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 17



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

13.1  Old Second Bancorp, Inc. - 1997 
      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.                                    22-57  

22.1  Subsidiaries of the Registrant               58    

23.1  Consent of Independent Accountant            59

25.1  Audit Opinion of Independent Accountant      60

27.1  Financial Data Schedule                      61



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 1997.



                              
                               Page 18


                             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 --------------------          By  /s/ James E. Benson    
                                             James E. Benson- Chairman,
                                             Chief Executive Officer, 
                                             and Director



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

 
                               Page 19

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

                                             /s/ Walter Alexander             
               ----------                   ---------------------------
                                            Walter Alexander - Director


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



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



               ----------                   ---------------------------      
                                            Marvin Fagel - Director


                                                                           
               ----------                   ---------------------------
                                            Joanne Hansen - Director


                                             /s/ Kenneth F. Lindgren
               ----------                   -----------------------------
                                            Kenneth F. Lindgren - Director



               ----------                   -----------------------------
                                            Jesse Maberry - Director


                                                                        
               ----------                   -----------------------------
                                            Gary McCarter - Director





                                Page 20


                        SIGNATURES, continued


               Date                         SIGNATURE AND TITLE



             ----------                     ------------------------         
                                            D. Chet McKee - Director
                    

                                             /s/ William J. Meyer            
             -----------                    --------------------------- 
                                            William J. Meyer - Director

                             
             ----------                     ---------------------------
                                            Larry A. Schuster - Director



                                              /s/ Willaim B. Skoglund 
              ----------                    ---------------------------
                                            William B. Skoglund -
                                            Vice President, Assistant        
                                            Secretary, and Director


                                              /s/ George Starmann III
              ----------                     --------------------------      
                                             George Starmann III
                                             Vice President and Director


                               Page 21