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General treaty collections
Collection of historical documents, including treaties, from 4000BC onwards.
EISIL Treaty Collections
Treaties and agreements grouped by region, organization or treaty secretariat. For treaties by subject, go to the EISIL homepage.
WorldLII Treaties and International Agreements
Treaties and agreements grouped by country, by subject, by international organizations & bodies and by multi-national collections.
Regional treaty collections
Treaties, conventions, protocols and charters concluded by the Organisation of African Unity / African Union.
Council of Europe Treaty Office
Council of Europe treaties, explanatory reports and status information.
European Union Treaties
European Union treaties are binding agreements between EU member countries. EUR-Lex contains the founding, amending and accession treaties, as well as some protocols.
European Treaties Office
Bilateral and multilateral treaties or agreements concluded by the European Union. This does not include the founding treaties or other agreements concluded between the member states of the EU.
Organization of American States
Multilateral treaties and bilateral agreements concluded by the Organization of American States.
What is a treaty?
The Vienna Convention on the Law of Treaties 1969, art 2(1a) defines a treaty as "an international agreement concluded between States in written form and governed by international law, whether embodied in a single instrument or in two or more related instruments and whatever its particular designation...".
How do I find a treaty?
Flare Index to Treaties is an excellent search tool for finding multilateral and selected bilateral treaties. It contains details of treaties from 1353 onwards, with links to full text where available.
United Nations treaties
"Every treaty and every international agreement entered into by any Member of the United Nations...shall as soon as possible be registered with the Secretariat and published by it" (Charter of the United Nations, art 102(1)).
National treaty collections
Links to UK treaty collections and guidance on UK treaty practice from the Foreign & Commonwealth Office (FCO).