Exhibit 21.1

LIST OF SUBSIDIARIES

Subsidiaries of the Company	Incorporated Under Laws of	Percent Owned by the Company
Old Second National Bank	United States	100%
Old Second Financial, Inc.	State of Illinois	100%
Old Second Capital Trust I	State of Delaware	100% of the common stock
Old Second Capital Trust II	State of Delaware	100% of the common stock
Old Second Affordable Housing Fund, L.L.C.	State of Illinois	Owned by Old Second National Bank
Old Second Management, LLC	State of Delaware	Owned by Old Second National Bank
Old Second Realty, LLC	State of Delaware	Owned by Old Second Management, LLC
Old Second Acquisition, Inc.	State of Delaware	100%

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