Identifying and locating sources of existing data can be important for a variety of reasons, including: asking new questions or providing a new analysis of the data, comparing results from various studies, replicating and validating previous results, developing or testing computational models, and extending a study across time, geography, or other variables by incorporating data from multiple datasets.
The resources listed below can help you find relevant datasets for use in your research. Many also serve as repositories if you are interested in a place to deposit and share your own research data.
re3data - A global registry of research data repositories covering a wide variety of academic subjects in the sciences, social sciences, and humanities.
Sherpa Juliet - Enables researchers and librarians to see funders' conditions for open access publication and is a searchable database and single focal point of up-to-date information concerning research funders' policies and their requirements on open access, publication and data archiving.
Fairsharing - Can be used to find both domain and generalist repositories as well as those recommended by specific journals, funders, and organizations.
OpenDOAR - A curated and authoratative list of academic open access repositories (over 2,600 listings).
Open Access Directory of Data Repositories - Lists of open access data repositories for a wide range of subject areas.
Library Databases with data sets: