International organizations are entities established by formal political agreements between their members that have the status of international treaties. It has been formed with the aim of helping to set the international agenda, strengthen political relationships, provide a place for developmental initiatives, etc.
Here we provide the important organizations and their headquarters and it will be useful for all competitive examinations like UPSC, IAS etc…
| Name of the Organization | Headquarters | Founded |
| African Development Bank Group | Abidjan, Cote d’Ivoire | 1964 |
| African Union (AU) | Addis Abab, Ethiopia | 2002 |
| Amnesty International (AI) | London, United Kingdom | 1961 |
| Andean Community | Lima, Peru | 1969 |
| Arab League | Al Tahrir Sq., Cairo, Egypt | 1945 |
| Arctic Council | Tromso, Norway | 1996 |
| Asian Development Bank (ADB) | Mandaluyong, Philippines | 1966 |
| Asia-Pacific Economic Cooperation (APEC) | Queenstown, Singapore | 1989 |
| Association of Caribbean States (ACS) | Port of Spain, Trinidad, Tobago | 1994 |
| Association of European Parliamentarians with Africa (AWEPA) | Amsterdam, Netherlands | 1984 |
| Association of Southeast Asian Nations (ASEAN) | Jakarta, Indonesia | 1967 |
| Bank for International Settlements (BIS) | Basel, Switzerland | 1930 |
| Black Sea Economic Cooperation (BSEC) | Istanbul, Turkey | 1992 |
| BRICS | Shanghai, China | 2009 |
| Caribbean Community (CARICOM) | Georgetown, Guyana | 1973 |
| Central American Bank for Economic Integration | Tegucigalpa, Honduras | 1960 |
| Common Market for Eastern and Southern Africa (COMESA) | Lusaka, Zambia | 1994 |
| Commonwealth Secretariat | London, United Kingdom | 1965 |
| Commonwealth of Nations | London, United Kingdom | 1960 |
| Commonwealth of Independent States (CIS) | Minsk Russia | 1991 |
| Council of Europe | Strasbourg, France | 1949 |
| Council of European Municipalities and Regions (CEMR) | Geneva, Switzerland | 1951 |
| Council of the Baltic Sea States (CBSS) | Stockholm, Switzerland | 1992 |
| Economic Community of West African States (ECOWAS) | Federal Capital Territory, Nigeria | 1975 |
| European Bank for Reconstruction and Development (EBRD) | London, United Kingdom | 1991 |
| European Central Bank (ECB) | Frankfurt, Germany | 1998 |
| European Free Trade Association (EFTA) | Geneva, Switzerland | 1960 |
| European Space Agency (ESA) | Paris, France | 1975 |
| European Union (EU) | Brussels, Belgium | 1993 |
| Food and Agriculture Organization (FAO) | Rome, Italy | 1945 |
| Federation International de Football Association (FIFA) | Zurich, Switzerland | 1904 |
| G-15 Summit | Geneva, Switzerland | 1990 |
| Greenpeace International | Amsterdam | 1971 |
| Group of Eight (G8) | New York, USA | 1975 |
| Gulf Cooperation Council (GCC) | Riyadh, Saudi Arabia | 1981 |
| International Air Transport Association (IATA) | Montreal, Canada | 1945 |
| Inter-American Development Bank (IDB) | Washington, DC, USA | 1959 |
| Intergovernmental Authority on Development (IGAD) | Djibouti, Djibouti | 1986 |
| International Atomic Energy Agency (IAEA) | Vienna, Austria | 1957 |
| International Bank for Reconstruction and Development (IBRD) | Washington D.C. (U.S.A.) | 1944 |
| International Centre for Settlement of Investment Disputes (ICSID) | Washington D.C. (U.S.A.) | 1957 (But operating starts in 1966) |
| International Chamber of Commerce (ICC) | Paris, France | 1919 |
| International Civil Aviation Organization (ICAO) | Montreal, Canada | 1947 |
| International Committee of the Red Cross (ICRC) | Geneva, Switzerland | 1863 |
| International Court of Justice (ICJ) | The Hague, Netherlands | 1945 |
| International Cricket Council | Dubai, United Arab Emirates | 1909 |
| International Criminal Police Organization (INTERPOL) | Lyon, France | 1923 |
| International Development Association (IDA) | Washington, DC, USA | 1960 |
| International Federation of Red Cross and Red Crescent Societies (IFRC) | Geneva, Switzerland | 1919 |
| International Finance Corporation (IFC) | Washington, DC, USA | 1956 |
| International Fund for Agricultural Development (IFAD) | Rome, Italy | 1977 |
| International Labour Organization (ILO) | Geneva, Switzerland | 1919 |
| International Maritime Organization (IMO) | London, United Kingdom | 1948 |
| International Monetary Fund (IMF) | Washington, DC, USA | 1944 |
| International Olympic Committee (IOC) | Lausanne, Switzerland | 1894 |
| International Organization for Migration (IOM) | Geneva, Switzerland | 1951 |
| International Organization for Standardization (ISO) | Geneva, Switzerland | 1947 |
| International Peace Bureau (IPB) | Geneva, Switzerland | 1891 |
| International Seabed Authority (ISA) | Kingston, Jamaica | 1994 |
| International Service for Human Rights (ISHR) | Geneva, Switzerland | 1984 |
| International Telecommunication Union (ITU) | Geneva, Switzerland | 1865 |
| International Trade Centre (ITC) | Geneva, Switzerland | 1964 |
| Inter-Parliamentary Union | Geneva, Switzerland | 1889 |
| Joint United Nations Programme on HIV/AIDS (UNAIDS) | Geneva, Switzerland | 1994 |
| League of Arab States | Cairo, Egypt | 1945 |
| Multilateral Investment Guarantee Agency (MIGA) | Washington, DC, USA | 1988 |
| New Development Bank (NDB) | Shanghai, China | 2014 |
| Nordic Council of Ministers | Copenhagen, Denmark | 1971 |
| North Atlantic Treaty Organization (NATO) | Washington, DC, USA | 1949 |
| Organization for Economic Co-operation and Development (OECD) | Paris, France | 1961 |
| Organization for Security and Co-operation in Europe (OSCE) | Vienna, Austria | 1975 |
| Organization for the Prohibition of Chemical Weapons (OPCW) | The Hague, Netherlands | 1997 |
| Organization of Arab Petroleum Exporting Countries (OAPEC) | Kuwait, Middle East | 1968 |
| Organization of the Islamic Conference (OIC) | Jeddah, Saudi Arabia | 1968 |
| Organization of the Petroleum Exporting Countries (OPEC) | Vienna, Austria | 1960 |
| Secretariat of the Pacific Community (SPC) | Noumea, New Caledonia | 1947 |
| Shanghai Cooperation Organization (SCO) | Beijing, China | 2001 |
| South Asian Association for Regional Cooperation (SAARC) | Kathmandu, Nepal | 1985 |
| The Non-Aligned Movement (NAM) | Central Jakarta, Indonesia | 1961 |
| UN Women | New York City, USA | 2010 |
| Union Latina | Paris, France | 1954 |
| United Nation Capital Development Fund (UNCDF) | New York City, USA | 1966 |
| United Cities & Local Governments (UCLG) | Barcelona, Spain | 2004 |
| United Nations Children’s Fund (UNICEF) | New York City, USA | 1946 |
| United Nations Conference on Trade & Development (UNCTAD) | Geneva, Switzerland | 1964 |
| United Nations Development Programme (UNDP) | New York City, USA | 1965 |
| United Nations Economic and Social Commission for Asia and the Pacific (ESCAP) | Bangkok, Thailand | 1947 |
| United Nations Economic and Social Commission for Western Asia (ESCWA) | Beirut, Lebanon | 1973 |
| United Nations Educational, Scientific and Cultural Organization (UNESCO) | Paris, France | 1945 |
| United Nations Environment Programme (UNEP) | Nairobi, Kenya | 1972 |
| United Nations Food and Agriculture Organization (FAO) | Rome, Italy | 1945 |
| United Nations Framework Convention on Climate Change (UNFCCC) | Bonn, Germany | 1994 |
| United Nations High Commissioner for Human Rights (UNHCHR) | Geneva, Switzerland and New York City, USA | 1993 |
| United Nations High Commissioner for Refugees (UNHCR) | Geneva, Switzerland | 1993 |
| United Nations Human Settlement Programme (UN-Habitat) | Nairobi, Kenya | 1978 |
| United Nations Industrial Development Organization (UNIDO) | Vienna, Austria | 1966 |
| United Nations Institute for Disarmament Research (UNIDIR) | Geneva, Switzerland | 1980 |
| United Nations Institute for Training and Research (UNITAR) | Geneva, Switzerland | 1963 |
| United Nations International Research and Training Institute for the Advancement of Women (INSTRAW) | Santo Domingo, Dominican Republic | 1975 |
| United Nations Office for Project Services (UNOPS) | Copenhagen, Denmark | 1973 |
| United Nations Office for the Coordination of Humanitarian Affairs (OCHA) | Geneva, Switzerland and New York City, USA | 1991 |
| United Nations Office on Drugs and Crime (UNODC) | Vienna, Austria | 1997 |
| United Nations Population Fund (UNPF) | New York City, USA | 1997 |
| United Nations Relief and Works Agency for Palestine Refugees (UNRWA) | Amman, Jordan | 1949 |
| United Nations System Staff College (UNSSC) | Turin, Italy | 2002 |
| United Nations University (UNU) | Tokyo, Japan | 1973 |
| Universal Postal Union (UPU) | Bern, Switzerland | 1874 |
| Western European Union (WEU) | Paris, France | 1954 |
| World Bank | Washington, DC, USA | 1944 |
| World Customs Organization | Brussels, Belgium | 1952 |
| World Federation of United Nations Associations (WFUNA) | Geneva, Switzerland and New York City, USA | 1946 |
| World Food Programme (WFP) | Rome, Italy | 1961 |
| World Health Organization (WHO) | Geneva, Switzerland | 1948 |
| World Hindu Economic Forum (WHEF) | New Delhi, India | 2010 |
| World Intellectual Property Organization (WIPO) | Geneva, Switzerland | 1967 |
| World Meteorological Organization (WMO) | Geneva, Switzerland | 1950 |
| World Organization Against Torture (OMCT) | Geneva, Switzerland | 1985 |
| World Tourism Organization (UNWTO) | Madrid, Spain | 1974 |
| World Trade Organization (WTO) | Geneva, Switzerland | 1995 |
| World Wide Fund for Nature (WWF) | Gland, Switzerland | 1961 |
