| Organisation (Acronym) | Full Form / Description | Headquarters Location | Remarks & Exam Notes |
| GATT | General Agreement on Tariffs and Trade | Geneva, Switzerland | Replaced by the WTO on Jan 1, 1995 |
| WTO | World Trade Organization | Geneva, Switzerland | Established Jan 1, 1995 (Replaced GATT) |
| Amnesty International | Global Human Rights NGO | London, UK | Founded in 1961; Nobel Peace Prize (1977) |
| ADB | Asian Development Bank | Manila (Mandaluyong), Philippines | Est. 1966; Japan & US are largest shareholders |
| ASEAN | Association of Southeast Asian Nations | Jakarta, Indonesia | 10 member states; Est. 1967 (Bangkok Declaration) |
| NATO | North Atlantic Treaty Organization | Brussels, Belgium | Est. 1949 (Washington Treaty); 32 member states |
| AU | African Union | Addis Ababa, Ethiopia | Replaced the OAU in 2002; Admitted to G20 |
| ICRC | International Committee of the Red Cross | Geneva, Switzerland | Est. 1863 by Henry Dunant; 3-time Nobel Peace Prize winner |
| SAARC | South Asian Association for Regional Cooperation | Kathmandu, Nepal | Est. 1985 in Dhaka; Secretariat in Kathmandu |
| UNEP | United Nations Environment Programme | Nairobi, Kenya | Est. June 5, 1972 (World Environment Day) |
| INTERPOL | International Criminal Police Organization | Lyon, France | – |
| League of Arab States | Arab League | Cairo, Egypt | Est. 1945 |
| COMECON | Council for Mutual Economic Assistance | Moscow, Russia | Dissolved in 1991 |
| WCC | World Council of Churches | Geneva, Switzerland | Est. 1948 |
| ECA | Economic Commission for Africa (UN) | Addis Ababa, Ethiopia | UN Regional Commission |
| ESCWA | Economic and Social Commission for Western Asia | Beirut, Lebanon | – |
| UNHCR | United Nations High Commissioner for Refugees | Geneva, Switzerland | Est. 1950; Nobel Peace Prize winner |
| IAEA | International Atomic Energy Agency | Vienna, Austria | Est. 1957; “Atoms for Peace” agency |
| UNIDO | UN Industrial Development Organization | Vienna, Austria | Est. 1966 |
| UNCTAD | UN Conference on Trade and Development | Geneva, Switzerland | Est. 1964 |
| WWF | World Wide Fund for Nature | Gland, Switzerland | Mascot: Giant Panda |
| IOC | International Olympic Committee | Lausanne, Switzerland | Est. 1894 |
| CHOGM | Commonwealth Heads of Government Meeting | London, UK (Secretariat) | Meets biennially in various member nations |
| OPEC | Organization of the Petroleum Exporting Countries | Vienna, Austria | Est. 1960 in Baghdad; HQ moved to Vienna in 1965 |
| OECD | Organization for Economic Co-operation and Development | Paris, France | Est. 1961 |
| CENTO | Central Treaty Organization (Baghdad Pact) | Ankara, Turkey | Dissolved in 1979 |
| Commonwealth of Nations | Association of former British colonies | London, UK | Headed by the British Monarch |
| Council of Europe | European Human Rights Body | Strasbourg, France | Est. 1949 (Distinct from the EU) |
| BENELUX | Belgium, Netherlands, Luxembourg Union | Brussels, Belgium | Pioneer of European integration |
| ESCAP | Economic and Social Commission for Asia and the Pacific | Bangkok, Thailand | UN Regional Commission |
| ECE | Economic Commission for Europe | Geneva, Switzerland | UN Regional Commission |
| ECLAC | Economic Commission for Latin America and the Caribbean | Santiago, Chile | UN Regional Commission |
| ANZUS | Australia, New Zealand, United States Security Treaty | Canberra, Australia | Tripartite security treaty |
| UN-Habitat | UN Human Settlements Programme (formerly UNCHS) | Nairobi, Kenya | HQ in Kenya |
| IMF & World Bank | International Financial Institutions | Washington, D.C., USA | Bretton Woods Twins |
| UNESCO | UN Educational, Scientific and Cultural Organization | Paris, France | Designates World Heritage Sites |
| WHO | World Health Organization | Geneva, Switzerland | Est. April 7, 1948 – World Health Day |
| ILO | International Labour Organization | Geneva, Switzerland | Oldest UN specialized agency; Est. 1919 |
| SCO | Shanghai Cooperation Organization | Beijing, China | Crucial regional security body |
| BRICS | New Development Bank (NDB) | Shanghai, China | Financial arm of BRICS |
