Links to public opinion data repositories and support resources. Also check out Harvard Library's Guide to Public Opinion Data.
United States
The American Panel Survey (TAPS): a survey research platform with about 200,000 respondents for a wide range of social science research.
Annenberg Election Surveys: Individual interviews from 2000, 2004, 2008 on traits Americans want in a president. Special emphasis on media exposure and political communication.
ANES: American National Election Survey - provides data on voting, public opinion, and political participation
Gallup: has many useful tables, but will only support data if contacted and asked nicely.
HuffPo: Keeps track of poll's topline results.
iPoll: repository of public opinion data managed by the U. of Connecticut
Pew Research Center for the People & the Press: Survey data from 1997. Includes lots of political, election and callback surveys. See also the main site of the Pew Research Center for additional data.
Research America: A well maintained resource on the latest public opinon polls on research to improve both U.S. and global health.
World Public Opinion
Polling the Nations: Compilation of public opinion surveys from 18,000+ surveys and 1,700+ polling organizations, conducted from 1986 through the present in the United States and more than 100 other countries around the world.
World Value Survey: cross-national data on people's values and beliefs. This data set has been maintained since 1981
ZACAT - GESIS: ISSP, Eurobarometer, European Values Survey, and additional national and cross-national surveys
Middle East
Arab Barometer: Opinion Polls on/for Arab countries
Africa
AfroBarometer: Opinion Polls on/for African countries
Latin America
Latin American Public Opinion Project (LAPOP): Public opinion data from 26 countries in the Western Hemisphere. Includes US as of 2010. Surveys conducted every two years.
Latinobarometer: Annual cross-national public opinion project in Latin America that began in 1995. Covers 18 countries.
Asia
Asiabarometer: Surveys of East, Southeast, South, and Central Asian countries.
Asian Barometer: Surveys of East and South Asian countries, run out of Taiwan.
JPOLL: Japanese public opinion data, translated into English.