United Nations (UN) · treaty

1 . Vienna Convention on the Law of Treaties (23 May 1969)

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Treaty status and participants

Participants parties: 119; signatories: 45 (as at Sep 30, 2026)
Place and date of signature Vienna, 23 May 1969
Entry into force 27 January 1980, in accordance with article 84(1).
Registration 27 January 1980, No. 18232
Text United Nations, Treaty Series , vol. 1155, p. 331.

The Convention was adopted on 22 May 1969 and opened for signature on 23 May 1969 by the United Nations Conference on the Law of Treaties. The Conference was convened pursuant to General Assembly resolutions 2166 (XXI) of 5 December 1966 and 2287 (XXII)2of 6 December 1967. The Conference held two sessions, both at the Neue Hofburg in Vienna, the first session from 26 March to 24 May 1968 and the second session from 9 April to 22 May 1969. In addition to the Convention, the Conference adopted the Final Act and certain declarations and resolutions, which are annexed to that Act. By unanimous decision of the Conference, the original of the Final Act was deposited in the archives of the Federal Ministry for Foreign Affairs of Austria. The text of the Final Act is included in document A/CONF.39/11/Add.2.

Key facts
Organisation United Nations (UN)
Document type treaty
Adoption date
Country United Nations