
The Internet Public Library maintains a list of associations' home pages, organized by subject, and searchable alphabetically or by keyword

Contains information for approximately 452,000 international and U.S. national, regional, state, local, and nonprofit membership organizations in all fields.
Online directory of scholarly societies and associations. Maintained by the University of Waterloo (Canada) Library.

Over 30,000 universities, colleges, schools of art and music, libraries, learned societies, research institutes, museums and art galleries are included in this database. Entries provide name, address, telephone and fax numbers, e-mail and internet addresses, principal personnel, activities, and publications, where available.

Collection of over 60,000 International non-profit organizations, including contact information, networks, and finances. Organizations are from more than 300 countries and territories and includes international non-governmental organizations and intergovernmental organizations covering a variety of fields.