As of 2026-10-12, Interpol tops the list with 196 members.
- #1 Interpol — 196 members
International Criminal Police Organization (founded 1923)
The International Criminal Police Organization – INTERPOL (ICPO–INTERPOL), commonly known as Interpol, is an international organization that facilitates worldwide police cooperation and crime control. It is the world's largest international police organization. It is headquartered in Lyon, France, with seven regional bureaus worldwide and a National Central Bureau in each of its 196 member states. Read more on Wikipedia.
Wikidata - #2 UNESCO — 195 members
specialised agency of the United Nations for education, sciences, and culture
The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations (UN) with the aim of promoting world peace and security through international cooperation in education, arts, sciences and culture. It has 194 member states and 12 associate members, as well as partners in the non-governmental, intergovernmental and private sector. Headquartered in Paris, France, UNESCO has 53 regional field offices and 199 national commissions. Read more on Wikipedia.
Wikidata - #3 United Nations — 193 members
global international and intergovernmental organization
The United Nations (UN) is an international intergovernmental organization established by the signing of the Charter of the United Nations on 26 June 1945 with the articulated mission of maintaining international peace and security, to develop friendly relations among states, to promote international cooperation, and to serve as a centre for harmonizing the actions of states in achieving those goals. Read more on Wikipedia.
Wikidata - #4 Organisation for the Prohibition of Chemical Weapons — 193 members
international organization based in The Hague
The Organisation for the Prohibition of Chemical Weapons (OPCW) is an intergovernmental organisation and the implementing body for the Chemical Weapons Convention (CWC), which entered into force on 29 April 1997. The OPCW, with its 193 member states, has its seat in The Hague, Netherlands; it oversees the global endeavour for the permanent and verifiable elimination of chemical weapons. Read more on Wikipedia.
Wikidata - #5 World Customs Organization — 187 members
intergovernmental organization
The World Customs Organization is an intergovernmental organization headquartered in Brussels, Belgium. Notable projects include its collaboration with the WTO on trade facilitation and the implementation of the SAFE Framework of Standards to secure global supply chains. The WCO works on customs-related matters including the development of international conventions, instruments, and tools on topics such as commodity classification, valuation, rules of origin, collection of customs revenue,... Read more on Wikipedia.
Wikidata - #6 Multilateral Investment Guarantee Agency — 181 members
International financial institution
The Multilateral Investment Guarantee Agency (MIGA) is an international financial institution which offers political risk insurance and credit enhancement guarantees. These guarantees help investors protect foreign direct investments against political and non-commercial risks in developing countries. MIGA is a member of the World Bank Group and is headquartered in Washington, D.C. in the United States. Read more on Wikipedia.
Wikidata - #7 International Renewable Energy Agency — 162 members
international organization
The International Renewable Energy Agency (IRENA) is an intergovernmental organization mandated to facilitate cooperation, advance knowledge, and promote the adoption and sustainable use of renewable energy. It is the first international organization to focus exclusively on renewable energy, addressing needs in both industrialized and developing countries. It was founded in 2009, and its statute entered into force on 8 July 2010. The agency is headquartered in Masdar City, Abu Dhabi. The... Read more on Wikipedia.
Wikidata - #8 International Criminal Court — 125 members
intergovernmental organization and international tribunal
The International Criminal Court (ICC) is an intergovernmental organisation and international tribunal seated in The Hague, Netherlands. Established in 2002 under the multilateral Rome Statute, the ICC is the first and only permanent international court with jurisdiction to prosecute individuals for the international crimes of genocide, crimes against humanity, war crimes, and the crime of aggression. The ICC is intended to complement, not replace, national judicial systems; it can exercise its... Read more on Wikipedia.
Wikidata - #9 International Olympic Committee — 103 members
non-governmental sports organisation (founded 1894)
The International Olympic Committee (IOC) is the international, non-governmental, sports governing body of the modern Olympic Games. Founded in 1894 by Pierre de Coubertin and Demetrios Vikelas, it is based in Lausanne, Switzerland. The IOC is the authority responsible for organising the Summer, Winter, and Youth Olympics. The IOC is also the governing body of the National Olympic Committees (NOCs) and the worldwide Olympic Movement, which includes all entities and individuals involved in the... Read more on Wikipedia.
Wikidata - #10 Organisation internationale de la Francophonie — 93 members
international organization of French-speaking governments
The Organisation internationale de la Francophonie is an international organization representing states and governments with a notable affiliation with French language and culture. Read more on Wikipedia.
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