<SEC-DOCUMENT>0001145549-21-001032-index.html : 20210112
<SEC-HEADER>0001145549-21-001032.hdr.sgml : 20210112
<ACCEPTANCE-DATETIME>20210112171723
ACCESSION NUMBER:		0001145549-21-001032
CONFORMED SUBMISSION TYPE:	N-CEN
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20201031
FILED AS OF DATE:		20210112
DATE AS OF CHANGE:		20210112
EFFECTIVENESS DATE:		20210112

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CALAMOS CONVERTIBLE OPPORTUNITIES & INCOME FUND
		CENTRAL INDEX KEY:			0001171471
		IRS NUMBER:				030426532
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		N-CEN
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-21080
		FILM NUMBER:		21524244

	BUSINESS ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653
		BUSINESS PHONE:		6302451046

	MAIL ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CEN
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>INTERNAL CONTROL RPT
<SEQUENCE>2
<FILENAME>ccoalif_internalctrl103120.htm
<DESCRIPTION>CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND INTERNAL CONTROL 10.31.20
<TEXT>
Document 2 - file: ccoalif_internalctrl103120.htm

</DOCUMENT>
</SEC-DOCUMENT>