Portals that help surface & link to datasets include:
DataPortals.org lists nearly 600 open data portals around the world
Gesis Data Search cross-searches portals and repositories for social science data
Google Dataset Search is an easy to use site that includes many datasets across the social sciences, including Politics. Note that it includes subscription datasets as well as free ones. Check the library website to see if we have access to subscription datasets (ask me if unsure).
Our World in Data is much more selective, but a useful site for some topics, notably because it includes essays which provide context and background information about data for various research areas.
Re3data global registry of research data repositories, all subject areas
Large-scale data repositories for politics & IR include:
Harvard Dataverse well-known repository of datasets, popular with many academics in political science
ICPSR leading US-based data repository
For more specific data links see the tabs below under "More Resources"
Many countries have a national data archive (such as UK Data Archive in the UK), and a list of some major ones is provided here
The resources listed below are fairly general in nature. Use the topic tabs under More Resources to locate specialised sources of data.
Finding appropriate sources of data and statistics is not always easy. If you cannot find what you are looking for, please do get in touch.
Provides annual data from 1815 onward (where available) for all countries. Nearly 200 demographic, political, legislative, economic and social science variables available in Excel format. CNTS is useful for broad cross-country comparisons requiring long time series data.
Mintel Academic gives access to consumer and market intelligence reports and data. The Library subscribes to the following sections: Mintel Trends, Mintel Market Sizes, UK Food Service, UK Leisure, UK Travel, UK Lifestyles, UK Media, and UK Retail Overview.
The Global Market Information Database (GMID) is a online business information resource providing intelligence on industries, countries and consumers, combining global expertise with local insight from analysts around the world.
See the Politics subject guide for further links to Public Opinion polls