<SEC-DOCUMENT>0000357173-20-000037-index.html : 20200717
<SEC-HEADER>0000357173-20-000037.hdr.sgml : 20200717
<ACCEPTANCE-DATETIME>20200717125341
ACCESSION NUMBER:		0000357173-20-000037
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20200818
FILED AS OF DATE:		20200717
DATE AS OF CHANGE:		20200717
EFFECTIVENESS DATE:		20200717

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OLD SECOND BANCORP INC
		CENTRAL INDEX KEY:			0000357173
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				363143493
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10537
		FILM NUMBER:		201033272

	BUSINESS ADDRESS:	
		STREET 1:		37 S RIVER ST
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
		BUSINESS PHONE:		6308920202

	MAIL ADDRESS:	
		STREET 1:		37 SOUTH RIVER STREET
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>osbc-20200818xdef14a.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: osbc-20200818xdef14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>osbc-20200818xdef14a001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: osbc-20200818xdef14a001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>osbc-20200818xdef14a020.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: osbc-20200818xdef14a020.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>osbc-20200818xdef14a021.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: osbc-20200818xdef14a021.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>osbc-20200818xdef14a022.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: osbc-20200818xdef14a022.jpg

</DOCUMENT>
</SEC-DOCUMENT>