List of parties to the Vienna Convention on the Law of Treaties

The Vienna Convention on the Law of Treaties (VCLT) is a treaty concerning the international law on treaties between states. It was adopted on 22 May 1969untreaty.un.org, Law of treaties , International Law Commission, last update: 30 June 2005. Consulted on 7 December 2008. and opened for signature on 23 May 1969.Vienna Convention on the Law of Treaties, pg. 1 The Convention entered into force on 27 January 1980.

As of May 2026, 119 state parties have ratified the convention, and a further 15 states have signed but have not ratified the convention. In addition, the Republic of China (Taiwan), which is currently only recognized by , signed the Convention in 1970 prior to the United Nations General Assembly's vote to transfer China's seat to the People's Republic of China (PRC) in 1971. When the PRC subsequently acceded to the Convention, they described the Republic of China's (ROC) signature as "illegal". 61 UN member states have neither signed nor ratified the Convention.

List of parties State Signed Deposited Method Accession Accession Accession Ratification Accession Accession Accession Accession Accession Ratification Accession as the Accession Accession Succession from Ratification Accession Accession Accession Accession Accession Ratification Accession Ratification Ratification Accession as Ratification Succession from Accession Accession Succession from Ratification Accession Ratification Accession Accession Ratification Accession Accession Ratification as Also acceded by on 20 October 1986 prior to German reunification Accession Ratification Accession Ratification Accession Ratification Ratification Accession Accession Accession Ratification Ratification Accession Accession Accession Ratification Accession Accession Accession Accession Accession Ratification Accession as the Accession Accession Ratification Accession Accession Accession Accession Accession Accession Ratification Accession Accession Succession from Ratification Accession Accession Accession Accession Ratification Accession Ratification Succession from Accession Accession Accession Ratification Ratification Accession Accession Accession as the Accession Accession Accession Succession as from Accession Succession from Succession from Accession Accession Accession Accession Ratification Accession Ratification Accession Accession Accession Accession Accession Accession Accession Accession Accession as the Ratification Ratification Accession Accession

List of signatories that have not ratified State Signed

Partially recognized state The Republic of China (Taiwan), which is currently only recognized by , signed the treaty prior to the United Nations General Assembly's vote to transfer China's seat to the People's Republic of China (PRC) in 1971. When the PRC subsequently acceded the treaty, they described the Republic of China's (ROC) signature as "illegal".

State Signed

Non-signatory states

References