Vienna Convention on the Law of Treaties

  • vienna convention on the law of treaties
    vienna convention on the law of treaties parties.svg
    vienna convention on the law of treaties
    signed23 may 1969
    locationvienna
    effective27 january 1980
    conditionratification by 35 states[1]
    signatories45
    parties116 (as of january 2018)[2]
    depositaryun secretary-general
    languagesarabic, chinese, english, french, russian and spanish[1]
    vienna convention on the law of treaties at wikisource

    the vienna convention on the law of treaties (vclt) is an international agreement regulating treaties between states.[3] known as the "treaty on treaties", it establishes comprehensive rules, procedures, and guidelines for how treaties are defined, drafted, amended, interpreted, and generally operate.[4] the vclt is considered a codification of customary international law and state practice concerning treaties.[5]

    the convention was adopted and opened to signature on 23 may 1969,[6][1] and entered into force on 27 january 1980.[1] it has been ratified by 116 states as of january 2018.[2] some non-ratifying parties, such as the united states, recognize parts of it as a restatement of customary law and binding upon them as such.[7]

    the vclt is regarded as one of the most important instruments in treaty law, and remains an authoritative guide in disputes over treaty interpretation.[8]

  • history
  • content and effects
  • scope
  • parties to the convention
  • vienna formula
  • interpretation of treaties
  • see also
  • footnotes
  • external links

Vienna Convention on the Law of Treaties
Vienna Convention on the Law of Treaties parties.svg
Vienna Convention on the Law of Treaties
Signed23 May 1969
LocationVienna
Effective27 January 1980
ConditionRatification by 35 states[1]
Signatories45
Parties116 (as of January 2018)[2]
DepositaryUN Secretary-General
LanguagesArabic, Chinese, English, French, Russian and Spanish[1]
Vienna Convention on the Law of Treaties at Wikisource

The Vienna Convention on the Law of Treaties (VCLT) is an international agreement regulating treaties between states.[3] Known as the "treaty on treaties", it establishes comprehensive rules, procedures, and guidelines for how treaties are defined, drafted, amended, interpreted, and generally operate.[4] The VCLT is considered a codification of customary international law and state practice concerning treaties.[5]

The Convention was adopted and opened to signature on 23 May 1969,[6][1] and entered into force on 27 January 1980.[1] It has been ratified by 116 states as of January 2018.[2] Some non-ratifying parties, such as the United States, recognize parts of it as a restatement of customary law and binding upon them as such.[7]

The VCLT is regarded as one of the most important instruments in treaty law, and remains an authoritative guide in disputes over treaty interpretation.[8]