Intergovernmental organizations established by treaty

The International Tribunal for the Law of the Sea (ITLOS) is an intergovernmental organization created by the mandate of the Third United Nations Conference on the Law of the Sea.

The South Asian Association for Regional Cooperation (SAARC) is the regional intergovernmental organization and geopolitical union of nations in South Asia.

The Dutch Language Union (Dutch: , NTU) is an international institution that governs issues regarding the Dutch language.

The Central Treaty Organization (CENTO), originally known as the Baghdad Pact or the Middle East Treaty Organization (METO) was formed in 1955 by Iran, Iraq, Pakistan, Turkey, and the United Kingdom.

The Zollverein ([ˈtsɔlfɛɐ̯ˌʔaɪn]) or German Customs Union was a coalition of German states formed to manage tariffs and economic policies within their territories.

The International Finance Corporation (IFC) is an international financial institution that offers investment, advisory, and asset management services to encourage private sector development in developing countries.

Petrocaribe is an oil alliance of many Caribbean states with Venezuela to purchase oil on conditions of preferential payment.

The Economic Community of Central African States (ECCAS; French: Communauté Économique des États de l'Afrique Centrale, CEEAC; Spanish: Comunidad Económica de los Estados de África Central, CEEAC; Portuguese: Comunidade Económica dos Estados da África Central, CEEAC) is an Economic Community of the African Union for promotion of regional economic co-operation in Central Africa.

The Southeast Asia Treaty Organization (SEATO) was an international organization for collective defense in Southeast Asia created by the Southeast Asia Collective Defense Treaty, or Manila Pact, signed in September 1954 in Manila, Philippines.

The Common Market for Eastern and Southern Africa (COMESA) is a free trade area with twenty member states stretching from Libya to Swaziland.

The International Refugee Organization (IRO) was an intergovernmental organization founded on 20 April 1946 to deal with the massive refugee problem created by World War II.

The Cooperation Council for the Arab States of the Gulf (Arabic: مجلس التعاون لدول الخليج العربية‎‎), originally (and still colloquially) known as the Gulf Cooperation Council (GCC, مجلس التعاون الخليجي), is a regional intergovernmental political and economic union consisting of all Arab states of the Persian Gulf, except for Iraq.

The Rio Group (Portuguese: Grupo do Rio [ˈɡɾupu du ˈʁi.u]; Spanish: Grupo de Río [ˈɡɾupo ðe ˈri.o]) was an international organization of Latin American and some Caribbean states.

The European Atomic Energy Community (EAEC or Euratom) is an international organisation founded in 1957 with the purpose of creating a specialist market for nuclear power in Europe, developing nuclear energy and distributing it to its member states while selling the surplus to non-member states.

The European Economic Area (EEA) is the area in which the Agreement on the EEA provides for the free movement of persons, goods, services and capital within the European Single Market.

The Asian Development Bank (ADB) is a regional development bank established on 19 December 1966 which is headquartered in Ortigas Center located in Mandaluyong, Metro Manila, Philippines, and maintains 31 field offices around the world, to promote social and economic development in Asia.

The International Seabed Authority (ISA) (French: Autorité internationale des fonds marins, Spanish: Autoridad Internacional de los Fondos Marinos) is an intergovernmental body based in Kingston, Jamaica, that was established to organize, regulate and control all mineral-related activities in the international seabed area beyond the limits of national jurisdiction, an area underlying most of the world’s oceans.

The African Development Bank Group (AfDB) is a multilateral development finance institution established to contribute to the economic development and social progress of African countries.

The Andean Community (Spanish: Comunidad Andina, CAN) is a customs union comprising the South American countries of Bolivia, Colombia, Ecuador, and Peru.

The International Organization for Migration (IOM) is an intergovernmental organization that provides services and advice concerning migration to governments and migrants, including internally displaced persons, refugees, and migrant workers.

The World Customs Organization (WCO) is an intergovernmental organization headquartered in Brussels, Belgium.

The International Committee for Weights and Measures (abbreviated CIPM from the French Comité international des poids et mesures) consists of eighteen persons from Member States of the Metre Convention (Convention du Mètre) appointed by the General Conference on Weights and Measures (CGPM) whose principal task is to ensure world-wide uniformity in units of measurement by direct action or by submitting proposals to the CGPM.

The Tuvalu Trust Fund is an international sovereign wealth fund established to benefit Tuvalu, a small, central Pacific island nation, by providing income to cover shortfalls in the national budget.

The Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) is an international organization that will be established upon the entry into force of the Comprehensive Nuclear-Test-Ban Treaty, a Convention that outlaws nuclear test explosions.

The Bureau International des Expositions (French: Bureau International des Expositions, BIE) is an intergovernmental organization created to supervise international exhibitions (also known as expos or world's fairs) falling under the jurisdiction of the Convention Relating to International Exhibitions.

EUCLID, also called Pôle Universitaire Euclide or Euclid University, is an international intergovernmental organization with a university charter established in 2008 and headquartered in The Gambia, West Africa.

The Asia-Pacific Fishery Commission (APFIC), originally called the Indo-Pacific Fisheries Council (IPFC) is a Food and Agriculture Organization (FAO) Article XIV Regional Fisheries Body which covers fisheries, aquaculture and related aquatic resource issues in the Asia-Pacific region.

The Asia Pacific Telecommunity (APT) was founded on the joint initiatives of the United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP) and the International Telecommunication Union (ITU).

The International Coffee Organization (ICO; established 1963 in London) was initiated in collaboration with the United Nations (UN) to enhance cooperation between nations that consume, distribute and produce coffee.

The Center for International Forestry Research (CIFOR) is a non-profit scientific research organization that conducts research on the use and management of forests with a focus on tropical forests in developing countries.

The International Mobile Satellite Organization (IMSO) is the intergovernmental organization that oversees certain public satellite safety and security communication services provided via the Inmarsat satellites.

The Pan American Health Organization (PAHO; originally the Pan-American Sanitary Bureau) is an international public health agency working to improve health and living standards of the people of the Americas.

The European University Institute (EUI) in Florence (Italy) is an international undergraduate, postgraduate and post-doctoral teaching and research institute established by European Union member states to contribute to cultural and scientific development in the social sciences, in a European perspective.

The Central American Integration System (Spanish: Sistema de la Integración Centroamericana, or SICA) is the economic and political organization of Central American states since February 1, 1993.

The Association of Caribbean States (ACS; Spanish: Asociación de Estados del Caribe; French: Association des États de la Caraïbe) is a union of nations centered on the Caribbean Basin.

The Indian Ocean Rim Association (IORA), formerly known as the Indian Ocean Rim Initiative and Indian Ocean Rim Association for Regional Cooperation (IOR-ARC), is an international organisation consisting of coastal states bordering the Indian Ocean.

The Assemblée des francophones fonctionnaires des organisations internationales (AFFOI), French for the Assembly of French speaking international civil servants , is a global network of French-speaking international civil servants.

The European Forest Institute (EFI) is an international organisation established by the European states.

The Energy Community, also referred to in the past as the Energy Community of South East Europe is an international organisation established between the European Union (EU) and a number of third countries to extend the EU internal energy market to Southeast Europe and beyond.

The Southeast Asian Fisheries Development Center (SEAFDEC) is an autonomous intergovernmental body established as a regional treaty organisation in 1967 to promote fisheries development in Southeast Asia.

The International Commission on Civil Status, or ICCS (French: Commission internationale de l'état civil, or CIEC), is a European intergovernmental organization and the first organization created after World War II in order to work for European integration.

The South Centre is an intergovernmental organisation of developing nations, established by an intergovernmental Agreement (Treaty), which came into force on 31 July 1995, with its headquarters in Geneva, Switzerland.

The International Centre for Genetic Engineering and Biotechnology (ICGEB) - was promoted by the United Nations Industrial Development Organization (UNIDO) as a centre of excellence for research and training in genetic engineering and biotechnology for the benefit of developing countries.

The Community of Sahel-Saharan States (CEN-SAD; French: Communauté des Etats Sahélo-Sahariens; Arabic: تجمع دول الساحل والصحراء; Portuguese: Comunidade dos Estados Sahelo-Saarianos) aims to create a free trade area within Africa.