A number of various international organizations and federal agencies maintain databases of subject-specific bilateral and multilateral treaties. Some of these databases are arranged by topic below.
U.S. Department of State – Arms Treaties
United Nations – Disarmament and Related Treaties
U.S. Department of State – United States Bilateral Investment Treaties
ICSID – Database of Bilateral Investment Treaties
Foreign Trade Information System, Organization of American States – Bilateral Investment Treaties
Investment promotion and protection treaties, compiled by International Centre for the Settlement of Investment Disputes
ECOLEX
Environmental Treaties and Resource Indicators (ENTRI)
United Nations Environment Programme – Register of International Treaties and Other Agreements in the Field of the Environment (2005)
OHCHR – UN Treaty Body Database
International Committee of the Red Cross - Treaties, States Parties and Commentaries
International Instruments on Human Rights, by M. Cherif Bassiouni (2003)
University of Minnesota Human Rights Library
World Intellectual Property Organization – WIPO-Administered Treaties
U.S. Department of Commerce – Trade and Related Agreements Database
WTO Regional Trade Agreements Database
Office of United States Trade Representative – Free Trade Agreements
Thomson Reuters Checkpoint – U.S. Tax Treaties in Force (RIA)
Wolters Kluwer – U.S. Tax Treaties Reporter (CCH)
IRS – United States Income Tax Treaties – A to Z
IBFD – Tax Research Platform