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 1969 and opened for signature on 23 May 1969. The Convention entered into force on 27 January 1980.

As of January 2018, 116 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 11 UN member states, 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". 64 UN member states have neither signed nor ratified the Convention.

List of parties

State	Signed	Deposited	Method
Albania		Jun 27, 2001	Accession
Algeria		Nov 8, 1988	Accession
Andorra		Apr 5, 2004	Accession
Argentina	May 23, 1969	Dec 5, 1972	Ratification
Armenia		May 17, 2005	Accession
Australia		Jun 13, 1974	Accession
Austria		Apr 30, 1979	Accession
Azerbaijan		Jan 11, 2018	Accession
Barbados	May 23, 1969	Jun 24, 1971	Ratification
Belarus		May 1, 1986	Accession as the Byelorussian SSR
Belgium		Sep 1, 1992	Accession
Benin		Nov 2, 2017	Accession
Bosnia and Herzegovina		Sep 1, 1993	Succession from Socialist Federal Republic of Yugoslavia
Brazil	May 23, 1969	Sep 25, 2009	Ratification
Bulgaria		Apr 21, 1987	Accession
Burkina Faso		May 25, 2006	Accession
Cameroon		Oct 23, 1991	Accession
Canada		Oct 14, 1970	Accession
Central African Republic		Dec 10, 1971	Accession
Chile	May 23, 1969	Apr 9, 1981	Ratification
China		Sep 3, 1997	Accession
Colombia	May 23, 1969	Apr 10, 1985	Ratification
Republic of the Congo	May 23, 1969	Apr 12, 1982	Ratification
Democratic Republic of the Congo		Jul 25, 1977	Accession as Zaire
Costa Rica	May 23, 1969	Nov 22, 1996	Ratification
Croatia		Oct 12, 1992	Succession from Socialist Federal Republic of Yugoslavia
Cuba		Sep 9, 1998	Accession
Cyprus		Dec 28, 1976	Accession
Czech Republic		Feb 22, 1993	Succession from Czechoslovakia
Denmark	Apr 18, 1970	Jun 1, 1976	Ratification
Dominican Republic		Apr 1, 2010	Accession
Ecuador	May 23, 1969	Feb 11, 2005	Ratification
Egypt		Feb 11, 1982	Accession
Estonia		Oct 21, 1991	Accession
Finland	May 23, 1969	Aug 19, 1977	Ratification
Gabon		Nov 5, 2004	Accession
Georgia		Jun 8, 1995	Accession
Germany	Apr 30, 1970	Jul 21, 1987	Ratification as West Germany Also acceded by East Germany on 20 October 1986 prior to German reunification
Greece		Oct 30, 1974	Accession
Guatemala	May 23, 1969	Jul 21, 1997	Ratification
Guinea		Sep 16, 2005	Accession
Guyana	May 23, 1969	Sep 15, 2005	Ratification
Haiti		Aug 25, 1980	Accession
Holy See	Sep 30, 1969	Feb 25, 1977	Ratification
Honduras	May 23, 1969	Sep 20, 1979	Ratification
Hungary		Jun 19, 1987	Accession
Ireland		Aug 7, 2006	Accession
Italy	Apr 22, 1970	Jul 25, 1974	Ratification
Jamaica	May 23, 1969	Jul 28, 1970	Ratification
Japan		Jul 2, 1981	Accession
Kazakhstan		Jan 5, 1994	Accession
Kiribati		Sep 15, 2005	Accession
South Korea	Nov 27, 1969	Apr 27, 1977	Ratification
Kuwait		Nov 11, 1975	Accession
Kyrgyzstan		May 11, 1999	Accession
Laos		Mar 31, 1998	Accession
Latvia		May 4, 1993	Accession
Lesotho		Mar 3, 1972	Accession
Liberia	May 23, 1969	Aug 29, 1985	Ratification
Libya		Dec 22, 2008	Accession as the Libyan Arab Jamahiriya
Liechtenstein		Feb 8, 1990	Accession
Lithuania		Jan 15, 1992	Accession
Luxembourg	Sep 4, 1969	May 23, 2003	Ratification
Malawi		Aug 23, 1983	Accession
Malaysia		Jul 27, 1994	Accession
Maldives		Sep 14, 2005	Accession
Mali		Aug 31, 1998	Accession
Malta		Sep 26, 2012	Accession
Mauritius		Jan 18, 1973	Accession
Mexico	May 23, 1969	Sep 25, 1974	Ratification
Moldova		Jan 26, 1993	Accession
Mongolia		May 16, 1988	Accession
Montenegro		Oct 23, 2006	Succession from Serbia and Montenegro
Morocco	May 23, 1969	Sep 26, 1972	Ratification
Mozambique		May 8, 2001	Accession
Myanmar		Sep 16, 1998	Accession
Nauru		May 5, 1978	Accession
Netherlands		Apr 9, 1985	Accession
New Zealand	Apr 29, 1970	Aug 4, 1971	Ratification
Niger		Oct 27, 1971	Accession
Nigeria	May 23, 1969	Jul 31, 1969	Ratification
North Macedonia		Jul 8, 1999	Succession from Socialist Federal Republic of Yugoslavia
Oman		Oct 18, 1990	Accession
Panama		Jul 28, 1980	Accession
Paraguay		Feb 3, 1972	Accession
Peru	May 23, 1969	Sep 14, 2000	Ratification
Philippines	May 23, 1969	Nov 15, 1972	Ratification
Poland		Jul 2, 1990	Accession
Portugal		Feb 6, 2004	Accession
Russia		Apr 29, 1986	Accession as the Soviet Union
Rwanda		Jan 3, 1980	Accession
Saudi Arabia		Apr 14, 2003	Accession
Senegal		Apr 11, 1986	Accession
Serbia		Mar 12, 2001	Succession as Federal Republic of Yugoslavia from Socialist Federal Republic of Yugoslavia
Slovakia		May 28, 1993	Succession from Czechoslovakia
Slovenia		Jul 6, 1992	Succession from Socialist Federal Republic of Yugoslavia
Solomon Islands		Aug 9, 1989	Accession
Spain		May 16, 1972	Accession
St. Vincent and the Grenadines		Apr 27, 1999	Accession
Palestine		Apr 2, 2014	Accession
Sudan	May 23, 1969	Apr 18, 1990	Ratification
Suriname		Jan 31, 1991	Accession
Sweden	Apr 23, 1970	Feb 4, 1975	Ratification
Switzerland		May 7, 1990	Accession
Syria		Oct 2, 1970	Accession
Tajikistan		May 6, 1996	Accession
Tanzania		Apr 12, 1976	Accession
Timor-Leste		Jan 8, 2013	Accession
Togo		Dec 28, 1979	Accession
Tunisia		Jun 23, 1971	Accession
Turkmenistan		Jan 4, 1996	Accession
Ukraine		May 14, 1986	Accession as the Ukrainian SSR
United Kingdom	Apr 20, 1970	Jun 25, 1971	Ratification
Uruguay	May 23, 1969	Mar 5, 1982	Ratification
Uzbekistan		Jul 12, 1995	Accession
Vietnam		Oct 10, 2001	Accession

List of signatories that have not ratified

State	Signed
Afghanistan	May 23, 1969
Bolivia	May 23, 1969
Cambodia	May 23, 1969
Côte d'Ivoire	Jul 23, 1969
El Salvador	Feb 16, 1970
Ethiopia	Apr 30, 1970
Ghana	May 23, 1969
Iran	May 23, 1969
Kenya	May 23, 1969
Madagascar	May 23, 1969
Nepal	May 23, 1969
Pakistan	Apr 29, 1970
Trinidad and Tobago	May 23, 1969
United States	Apr 24, 1970
Zambia	May 23, 1969

Partially recognized state

The Republic of China (Taiwan), which is currently only recognized by 11 UN member states, 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".