ICPSR, Inter-University Consortium for Political and Social Research
Established in 1962, ICPSR is the world's largest archive of digital social science data.
Pew Research Center
"Nonpartisan "fact tank" that provides information on the issues, attitudes and trends shaping America and the world. It does so by conducting public opinion polling and social science research; by reporting news and analyzing news coverage; and by holding forums and briefings."
Afrobarometer – Africa Public Opinion Research
"An independent, nonpartisan research project that measures the social, political and economic atmosphere in Africa."
Associated Press Polls
Ipsos News Center AP polls, from 2003 to the present
European Public Opinion Analysis
Sponsored by the European Commission since 1973. Provides current and past summaries and full reports from the general and topical survey series as well as links to other European polls.
Mansfield Asian Opinion Poll Database
"A reference for researchers and others to help monitor key public opinion trends in Northeast Asia."
Polling the Nations
Searchable and browseable database of over 350,000 questions from more than 14,000 public opinion surveys conducted by more than 700 different organizations in the U.S. and abroad.
World Public Opinion
"An international collaborative project whose aim is to give voice to public opinion around the world on international issues."