This article contains a list of treaties by number of parties to the treaty. A "party" to a treaty is a state or other entity that ratifies, accedes to, approves, or succeeds to the treaty. [a]
In general, multilateral treaties are open to ratification by any state. Some treaties may also be ratified by supranational bodies, such as the European Union, and by other international organizations.
In practice, the depositary of a treaty will usually only recognise ratifications of the treaty that are performed by a state that is recognised as a state at international law. A state can be formally recognised as such by becoming a member of the United Nations; there are currently 193 member states of the United Nations. The only non-UN states that undoubtedly meet the standard of statehood are the Cook Islands and Niue, who have had their "full treaty-making capacity" recognised by the United Nations Secretariat. [1] [2] The Holy See (Vatican City) is also widely recognised as being able to legitimately ratify treaties, and has been granted non-member observer state status by the UN General Assembly. [3] [b] Following the UNGA passing a resolution granting non-member observer state status to the State of Palestine, the UNSG has begun to recognize its right to ratify treaties. Ratifications performed by other states with more limited recognition—such as Abkhazia, the Republic of Artsakh (Nagorno-Karabakh), the Republic of China (Taiwan), Kosovo, Northern Cyprus, the Sahrawi Arab Democratic Republic (Western Sahara), Somaliland, South Ossetia, and Transnistria—have usually not been recognised by treaty depositaries as states that can ratify treaties, although there are some exceptions to this general rule.
If a state party to a treaty denounces the treaty, the state (often after a certain period before the denunciation takes effect) is no longer a party to the treaty, although in some cases certain parts of the treaty may continue to apply.
States change over time, and often a state that ratified a treaty will cease to exist. International law deals with this issue in two ways. First, it is possible for a state to be declared the successor state to the defunct state. In this situation, any ratifications performed by the defunct state are transferred to and attributed to the successor state. Examples of successor states are the Russian Federation (successor to the Soviet Union), People's Republic of China (successor to the mainland Republic of China), Serbia (successor to Serbia and Montenegro), Belarus (successor to the Byelorussian SSR), Ukraine (successor to the Ukrainian SSR), and Tanzania (successor to Tanganyika). It is possible for a single state to be the successor state of multiple states, as with Yemen being the successor state of both North Yemen and South Yemen.
Second, some states have no legal successor state but cease to exist; in such cases, the ratifications performed by the state are disregarded. In some cases, such states are subsumed into an existing state, as when East Germany merged into the Federal Republic of Germany, and when Zanzibar merged into Tanzania (at first United Republic of Tanganyika and Zanzibar). In other cases, the defunct state is divided into two or more states, with none of the states being designated as the formal successor state. Examples of the latter situation include SFR Yugoslavia (now six independent states) and Czechoslovakia (now two independent states). In this situation, the new states usually declare which treaties the defunct state ratified continue to have force for the new state. Such a declaration is regarded as a "ratification" by the new state. [c]
For purposes of the numbers in this list, only ratifications, accessions, or successions of currently existing states are considered. No regard is given to ratifications by defunct states that have no current successor state.
Due to these limitations, in 2021, the maximum number of state ratifications that a multilateral treaty can have is 198; this total consists of all 193 UN member states; both UN observer states, the Holy See (Vatican City) and the State of Palestine; as well as the Cook Islands, Niue, and Kosovo (member states of eight, five, and two UN specialized agencies respectively). If supranational or other international organizations ratify the treaty, the total number of ratifications may exceed 198.
When a treaty is ratified by nearly all recognized states in the world, the legal principles contained in the treaty may become customary international law. Customary international law applies to all states, whether or not the state has ratified a treaty that enshrines the principle. There is no set number of ratifications that are required to convert a treaty's principles into customary international law, and states and experts often disagree on what principles have and have not attained the status.
Below is the list of treaties by number of parties. Only treaties with a minimum of 170 parties are included.
International human rights instruments are the treaties and other international texts that serve as legal sources for international human rights law and the protection of human rights in general. There are many varying types, but most can be classified into two broad categories: declarations, adopted by bodies such as the United Nations General Assembly, which are by nature declaratory, so not legally-binding although they may be politically authoritative and very well-respected soft law;, and often express guiding principles; and conventions that are multi-party treaties that are designed to become legally binding, usually include prescriptive and very specific language, and usually are concluded by a long procedure that frequently requires ratification by each states' legislature. Lesser known are some "recommendations" which are similar to conventions in being multilaterally agreed, yet cannot be ratified, and serve to set common standards. There may also be administrative guidelines that are agreed multilaterally by states, as well as the statutes of tribunals or other institutions. A specific prescription or principle from any of these various international instruments can, over time, attain the status of customary international law whether it is specifically accepted by a state or not, just because it is well-recognized and followed over a sufficiently long time.
The Universal Postal Union is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations and facilitates a uniform worldwide postal system. It has 192 member states and is headquartered in Bern, Switzerland.
The Vienna Convention on Diplomatic Relations of 1961 is an international treaty that defines a framework for diplomatic relations between independent countries. Its aim is to facilitate "the development of friendly relations" among governments through a uniform set of practices and principles; most notably, it codifies the longstanding custom of diplomatic immunity, in which diplomatic missions are granted privileges that enable diplomats to perform their functions without fear of coercion or harassment by the host country. The Vienna Convention is a cornerstone of modern international relations and international law and is almost universally ratified and observed; it is considered one of the most successful legal instruments drafted under the United Nations.
The United Nations Convention on the Rights of the Child is an international human rights treaty which sets out the civil, political, economic, social, health and cultural rights of children. The convention defines a child as any human being under the age of eighteen, unless the age of majority is attained earlier under national legislation.
Succession of states is a concept in international relations regarding a successor state that has become a sovereign state over a territory that was previously under the sovereignty of another state. The theory has its roots in 19th-century diplomacy. A successor state often acquires a new international legal personality, which is distinct from a continuing state, also known as a continuator or historical heir, which despite changes to its borders retains the same legal personality and possess all its existing rights and obligations.
The International Covenant on Economic, Social and Cultural Rights (ICESCR) is a multilateral treaty adopted by the United Nations General Assembly (GA) on 16 December 1966 through GA. Resolution 2200A (XXI), and came into force on 3 January 1976. It commits its parties to work toward the granting of economic, social, and cultural rights (ESCR) to all individuals including those living in Non-Self-Governing and Trust Territories. The rights include labour rights, the right to health, the right to education, and the right to an adequate standard of living. As of February 2024, the Covenant has 172 parties. A further four countries, including the United States, have signed but not ratified the Covenant.
The Protocol Amending the Agreements, Conventions and Protocols on Narcotic Drugs concluded at The Hague on 23 January 1912, at Geneva on 11 February 1925 and 19 February 1925, and 13 July 1931, at Bangkok on 27 November 1931 and at Geneva on 26 June 1936 was a treaty, signed on 11 December 1946 at Lake Success, that shifted the drug control functions previously assigned to the League of Nations to the United Nations. As the Protocol's official title says, it modifies the provisions of the:
The Convention Relating to the Status of Refugees, also known as the 1951 Refugee Convention or the Geneva Convention of 28 July 1951 is a United Nations multilateral treaty that defines who a refugee is and sets out the rights of individuals who are granted asylum and the responsibilities of nations that grant asylum. The convention also sets out which people do not qualify as refugees, such as war criminals. The convention also provides for some visa-free travel for holders of refugee travel documents issued under the convention.
Human rights are largely respected in Switzerland, one of Europe's oldest democracies. Switzerland is often at or near the top in international rankings of civil liberties and political rights observance. Switzerland places human rights at the core of the nation's value system, as represented in its Federal Constitution. As described in its FDFA's Foreign Policy Strategy 2016-2019, the promotion of peace, mutual respect, equality and non-discrimination are central to the country's foreign relations.
The Treaty of Bern, signed on 9 October 1874, established the General Postal Union, which is today known as the Universal Postal Union. Named for the Swiss city of Bern, where it was signed, the treaty was the result of an international conference convened by the Swiss Government on 15 September 1874. It was attended by representatives of 22 nations. Plans for the conference had been drawn up by Heinrich von Stephan, Postmaster-General of the German Reichspost who demanded from the neutral Switzerland the organization of an International Postal Congress following the end of the French-German war of 1870–1871.
The Convention Relating to the Status of Stateless Persons is a 1954 United Nations multilateral treaty that aims to protect stateless individuals.
The Convention on Registration of Objects Launched into Outer Space was adopted by the United Nations General Assembly in 1974 and went into force in 1976. As of February 2022, it has been ratified by 72 states.
The Convention on the Rights of Persons with Disabilities is an international human rights treaty of the United Nations intended to protect the rights and dignity of persons with disabilities. Parties to the convention are required to promote, protect, and ensure the full enjoyment of human rights by persons with disabilities and ensure that persons with disabilities enjoy full equality under the law. The Convention serves as a major catalyst in the global disability rights movement enabling a shift from viewing persons with disabilities as objects of charity, medical treatment and social protection towards viewing them as full and equal members of society, with human rights. The convention was the first U.N. human rights treaty of the twenty-first century.
The Holy See is not a member of the United Nations but was granted permanent observer state status on 6 April 1964. In that capacity, it has the right to attend all sessions of the United Nations General Assembly, the United Nations Security Council, and the United Nations Economic and Social Council to observe their work. Accordingly, the Holy See has established permanent observer missions in New York and in Geneva and has been able to influence the decisions and recommendations of the United Nations.
The International Convention Concerning the Use of Broadcasting in the Cause of Peace is a 1936 League of Nations treaty whereby states agreed to prohibit the use of broadcasting for propaganda or the spreading of false news. It was the first international treaty to bind states to "restrict expression which constituted a threat to international peace and security".