Treaty

Vienna Convention on the law of treaties between States and International Organizations or between International Organizations

Date modified Regarding
05-10-2026 Party

Party

Brazil modified

  • Ratification: 01-10-2026 (R)
  • Reservations / Declarations: Yes
  • added reservation
    01-10-2026
    … subject to reservations with respect to Articles 25 and 66.


10-05-2023 General information, Party

Party

Albania

  • Ratification: 25-04-2014 (A)

Argentina

  • Signature: 30-01-1987
  • Ratification: 17-08-1990 (R)

Australia

  • Ratification: 16-06-1993 (A)

Austria

  • Signature: 21-03-1986
  • Ratification: 26-08-1987 (R)

Belarus

  • Ratification: 30-12-1999 (A)

Benin

  • Signature: 24-06-1987

Bosnia and Herzegovina

  • Signature: 21-03-1986

Brazil

  • Signature: 21-03-1986

Burkina Faso

  • Signature: 21-03-1986

Côte d'Ivoire

  • Signature: 21-03-1986

Council of Europe

  • Signature: 11-05-1987

Croatia

  • Ratification: 11-04-1994 (A)

CTBTO (Comprehensive Test Ban Treaty Organization) Preparatory Commission

  • Ratification: 11-06-2002 (A)

Cyprus

  • Signature: 29-06-1987
  • Ratification: 05-11-1991 (R)

Czech Republic

  • Ratification: 22-02-1993 (Su)

Czechoslovakia (<01-01-1993)

  • Ratification: 19-10-1990 (A)

Democratic Republic of the Congo

  • Signature: 21-03-1986

Egypt

  • Signature: 21-03-1986

Estonia

  • Ratification: 21-10-1991 (A)

FAO (Food and Agriculture Organization of the United Nations)

  • Signature: 29-06-1987

Gabon

  • Ratification: 05-11-2004 (A)

Greece

  • Signature: 15-07-1986
  • Ratification: 28-01-1992 (R)

Hungary

  • Ratification: 17-08-1988 (A)

IAEA (International Atomic Energy Agency)

  • Ratification: 26-04-2001 (A)

ICAO (International Civil Aviation Organization)

  • Signature: 29-06-1987
  • Ratification: 24-12-2001 (R)

ILO (International Labour Organization)

  • Signature: 31-03-1987
  • Ratification: 31-07-2000 (R)

IMO (International Maritime Organization)

  • Signature: 30-06-1987
  • Ratification: 14-02-2000 (R)

Interpol (International Criminal Police Organsiation)

  • Ratification: 03-01-2001 (A)

Italy

  • Signature: 17-12-1986
  • Ratification: 20-06-1991 (R)

ITU (International Telecommunication Union)

  • Signature: 29-06-1987

Japan

  • Signature: 24-04-1987

Liberia

  • Ratification: 16-09-2005 (A)

Liechtenstein

  • Ratification: 08-02-1990 (A)

Malawi

  • Signature: 30-06-1987

Malta

  • Ratification: 26-09-2012 (A)

Mexico

  • Signature: 21-03-1986
  • Ratification: 10-03-1988 (R)

Moldova

  • Ratification: 26-01-1993 (A)

Montenegro

  • Signature: 31-03-1986

Morocco

  • Signature: 21-03-1986

OPCW (Organization for the Prohibition of Chemical Weapons)

  • Ratification: 02-06-2000 (A)

Palestine

  • Ratification: 22-03-2018 (A)

Portugal

  • Ratification: 21-07-2021 (A)

Republic of Korea, the

  • Signature: 29-06-1987

Serbia

  • Signature: 21-03-1986

Slovakia

  • Ratification: 28-05-1993 (Su)

Spain

  • Ratification: 24-07-1990 (A)

Sudan

  • Signature: 21-03-1986

Sweden

  • Signature: 18-06-1987
  • Ratification: 10-02-1988 (R)

Switzerland

  • Ratification: 07-05-1990 (A)

UN (United Nations)

  • Signature: 12-02-1987
  • Ratification: 21-12-1998 (R)

UNESCO (UN-Educational, Scientific and Cultural Organisation)

  • Signature: 23-06-1987

UNIDO (UN-Industrial Development Organization)

  • Ratification: 04-03-2002 (A)

United Kingdom

  • Signature: 24-02-1987
  • Ratification: 20-06-1991 (R)

United States of America

  • Signature: 26-06-1987

UPU (Universal Postal Union)

  • Ratification: 19-10-2004 (A)

Uruguay

  • Ratification: 10-03-1999 (A)

WHO (World Health Organization)

  • Signature: 30-04-1987
  • Ratification: 22-06-2000 (R)

WIPO (World Intellectual Property Organization)

  • Ratification: 24-10-2000 (A)

WMO (World Meteorological Organization)

  • Signature: 30-06-1987

Yugoslavia (< 25-06-1991)

  • Signature: 21-03-1986

Zambia

  • Signature: 21-03-1986

Belgium

  • Signature: 09-06-1987
  • Ratification: 01-09-1992 (R)
  • Reservations / Declarations: Yes
  • Objections: No
  • reservation
    21-06-1993
    The Belgian State will not be bound by articles 53 and 64 of the Convention with regard to any party which, in formulating a reservation concerning article 66 (2), objects to the settlement procedure established by this article.


Bulgaria

  • Ratification: 10-03-1988 (A)
  • Reservations / Declarations: Yes
  • Objections: Yes
  • reservation
    10-03-1988
    Declaration on article 2, paragraph 1, sub-paragraph j: The People's Republic of Bulgaria considers that the practice of an individual International Organization may be considered as established according to article 2, paragraph 1, sub-paragraph j, only when it has been adopted as such by all Member States of this Organization. Declaration on article 62, paragraph 2: The People's Republic of Bulgaria considers that the term "Boundary" as it is used in the text of article 62, paragraph 2, means State Boundary and it may be established only by States. Declaration on article 74, paragraph 3: The People's Republic of Bulgaria considers that a treaty which an International Organization is a party to, may establish obligations for Members States of this Organization only if the Member States have expressed their consent in advance in each individual case.

    objection to reservation

    Objection Germany, 20-06-1991

    The Federal Republic of Germany rejects the reservation made by the Republic of Bulgaria with regard to article 66, paragraph 2 of the Vienna Convention on the Law of Treaties between States and International Organizations or between International Organizations as incompatible with the object and purpose of the said Convention. In this connection it wishes to point out that the Federal Republic of Germany considers articles 53 and 64 of the Convention, on the one hand, and article 66, paragraph 2, on the other, to be inextricably linked


Denmark

  • Signature: 08-06-1987
  • Ratification: 26-07-1994 (R)
  • Reservations / Declarations: Yes
  • Objections: No
  • reservation
    26-07-1994
    ... Where parties formulate reservations or partial reserva- tions with respect to the provisions of article 66 of the Convention concerning the obligatory settlement of certain disputes, Denmark does not consider itself bound by the provisions of Part V of the Convention whereby the procedures for settlement set forth in article 66 shall not be applied if reservations have been formulated by other parties.


Germany

  • Signature: 27-04-1987
  • Ratification: 20-06-1991 (R)
  • Reservations / Declarations: Yes
  • Objections: No
  • reservation
    20-06-1991
    1. The Federal Republic of Germany presumes that the juris- diction of the International Court of Justice brought about by consent of States outside the [said] Convention cannot be excluded by invoking the provisions of article 66, paragraph 4 of the Convention. 2. The Federal Republic of Germany interprets "measures taken in conformity with the Charter of the United Nations" as referred to in article 76 of the [said] Convention to mean decisions taken in future by the United Nations Security Council in conformity with Chapter VII of the Charter on the maintenance of international peace and security.


Netherlands, the Kingdom of the

  • Signature: 12-06-1987
  • Ratification: 18-09-1997 (R)
  • Reservations / Declarations: Yes
  • Objections: No
  • reservation
    18-09-1997
    The Kingdom of the Netherlands does not regard the provisions of article 66 (b), (c) and (d) of the Convention as providing `some other method of peaceful settlement' within the meaning of the declaration of the Kingdom of the Netherlands accepting as compulsory the jurisdiction of the International Court of Justice which was deposited with the Secretary-General of the United Nations on 1 August 1956; The Kingdom of the Netherlands is of the opinion that the provisions regarding the settlement of disputes, as laid down in article 66 of the Convention, are an important part of the Convention and that they cannot be separated from the substantive rules with which they are connected.


Senegal

  • Signature: 09-07-1986
  • Ratification: 06-08-1987 (R)
  • Reservations / Declarations: Yes
  • Objections: No
  • reservation
    09-07-1986
    In signing this Convention, [the Government of Senegal de- clares] that the completion of this formality shall not be inter- preted in so far as Senegal is concerned as a recognition of the right of international organizations to appear as parties before the International Court of Justice.