<SEC-DOCUMENT>0001193125-16-749238-index.html : 20161027
<SEC-HEADER>0001193125-16-749238.hdr.sgml : 20161027
<ACCEPTANCE-DATETIME>20161027121933
ACCESSION NUMBER:		0001193125-16-749238
CONFORMED SUBMISSION TYPE:	N-Q
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20160831
FILED AS OF DATE:		20161027
DATE AS OF CHANGE:		20161027
EFFECTIVENESS DATE:		20161027

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Flaherty & Crumrine PREFERRED INCOME OPPORTUNITY FUND INC
		CENTRAL INDEX KEY:			0000882071
		IRS NUMBER:				954355600
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		N-Q
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-06495
		FILM NUMBER:		161954661

	BUSINESS ADDRESS:	
		STREET 1:		301 E COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
		BUSINESS PHONE:		(626) 795-7300

	MAIL ADDRESS:	
		STREET 1:		301 COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PREFERRED INCOME OPPORTUNITY FUND INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-Q
<SEQUENCE>1
<FILENAME>d244092dnq.htm
<DESCRIPTION>FLAHERTY & CRUMRINE PREFERRED INCOME OPPORTUNITY FUND
<TEXT>
Document 1 - file: d244092dnq.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d244092dex99cert.htm
<DESCRIPTION>302 CERTIFICATIONS
<TEXT>
Document 2 - file: d244092dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g244092g15h91.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g244092g15h91.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g244092pie_01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g244092pie_01.jpg

</DOCUMENT>
</SEC-DOCUMENT>