<SEC-DOCUMENT>0001047469-16-016541-index.html : 20161104
<SEC-HEADER>0001047469-16-016541.hdr.sgml : 20161104
<ACCEPTANCE-DATETIME>20161104172508
ACCESSION NUMBER:		0001047469-16-016541
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20161104
DATE AS OF CHANGE:		20161104

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:			1215

	FILING VALUES:
		FORM TYPE:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-214459
		FILM NUMBER:		161976055

	BUSINESS ADDRESS:	
		STREET 1:		37 S RIVER ST
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
		BUSINESS PHONE:		7088920202

	MAIL ADDRESS:	
		STREET 1:		37 SOUTH RIVER STREET
		CITY:			AURORA
		STATE:			IL
		ZIP:			60507
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3
<SEQUENCE>1
<FILENAME>a2230204zs-3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: a2230204zs-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.10
<SEQUENCE>2
<FILENAME>a2230204zex-4_10.htm
<DESCRIPTION>EX-4.10
<TEXT>
Document 2 - file: a2230204zex-4_10.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>a2230204zex-5_1.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 3 - file: a2230204zex-5_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-12.1
<SEQUENCE>4
<FILENAME>a2230204zex-12_1.htm
<DESCRIPTION>EX-12.1
<TEXT>
Document 4 - file: a2230204zex-12_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>5
<FILENAME>a2230204zex-23_1.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 5 - file: a2230204zex-23_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g502868.jpg
<DESCRIPTION>G502868.JPG
<TEXT>
Document 6 - file: g502868.jpg

</DOCUMENT>
</SEC-DOCUMENT>