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

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^[1] and opened for signature on 23 May 1969.^[2] The Convention entered into force on 27 January 1980.^[2]

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, 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^[3]	Signed	Deposited	Method
Albania			Accession
Algeria			Accession
Andorra			Accession
Argentina			Ratification
Armenia			Accession
Australia			Accession
Austria			Accession
Azerbaijan			Accession
Barbados			Ratification
Belarus			Accession as the
Belgium			Accession
Benin			Accession
Bosnia and Herzegovina			Succession from
Brazil			Ratification
Bulgaria			Accession
Burkina Faso			Accession
Cameroon			Accession
Canada			Accession
Central African Republic			Accession
Chile			Ratification
China			Accession
Colombia			Ratification
			Ratification
			Accession as
Costa Rica			Ratification
Croatia			Succession from
Cuba			Accession
Cyprus			Accession
Czech Republic			Succession from
Denmark			Ratification
Dominican Republic			Accession
Ecuador			Ratification
Egypt			Accession
Estonia			Accession
Finland			Ratification
Gabon			Accession
Georgia			Accession
Germany			Ratification as Also acceded by on 20 October 1986 prior to German reunification
Greece			Accession
Guatemala			Ratification
Guinea			Accession
Guyana			Ratification
Haiti			Accession
			Ratification
Honduras			Ratification
Hungary			Accession
Ireland			Accession
Italy			Ratification
Jamaica			Ratification
Japan			Accession
Kazakhstan			Accession
Kiribati			Accession
			Ratification
Kuwait			Accession
Kyrgyzstan			Accession
			Accession
Latvia			Accession
Lesotho			Accession
Liberia			Ratification
Libya			Accession as the
Liechtenstein			Accession
Lithuania			Accession
Luxembourg			Ratification
Malawi			Accession
Malaysia			Accession
Maldives			Accession
Mali			Accession
Malta			Accession
Mauritius			Accession
Mexico			Ratification
			Accession
Mongolia			Accession
Montenegro			Succession from
Morocco			Ratification
Mozambique			Accession
Myanmar			Accession
Nauru			Accession
Netherlands			Accession
New Zealand			Ratification
Niger			Accession
Nigeria			Ratification
			Succession from
Oman			Accession
Panama			Accession
Paraguay			Accession
Peru			Ratification
Philippines			Ratification
Poland			Accession
Portugal			Accession
			Accession as the
Rwanda			Accession
Saudi Arabia			Accession
Senegal			Accession
Serbia			Succession as from
Slovakia			Succession from
Slovenia			Succession from
Solomon Islands			Accession
Spain			Accession
			Accession
			Accession
Sudan			Ratification
Suriname			Accession
Sweden			Ratification
Switzerland			Accession
			Accession
Tajikistan			Accession
			Accession
Timor-Leste			Accession
Togo			Accession
Tunisia			Accession
Turkmenistan			Accession
Ukraine			Accession as the
United Kingdom			Ratification
Uruguay			Ratification
Uzbekistan			Accession
			Accession

List of signatories that have not ratified

State	Signed
Afghanistan

Cambodia
Cote d'Ivoire
El Salvador
Ethiopia
Ghana

Kenya
Madagascar
Nepal
Pakistan
Trinidad and Tobago
United States
Zambia

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".^[3]