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| G | G-77 | Group of 77 |
| . . . | Group of Eight | |
| GATT | General Agreement on Tariffs and Trade (UN) | |
| GCC | Gulf Cooperation Council | |
| I | IADB | Inter-American Defense Board |
| IAEA | International Atomic Energy Agency (UN) | |
| IATP | International Association of Tungsten Producers | |
| IBA | International Bauxite Association | |
| IBEC | International Bank for Economic Cooperation | |
| IBRD | International Bank for Reconstruction and Development (World Bank. UN) | |
| ICAC | International Cotton Advisory Committee | |
| ICAO | International Civil Aviation Organization (UN) | |
| ICCO | International Cocoa Organization | |
| ICEM | Intergovernmental Committee for European Migration | |
| ICES | International Cooperation in Ocean Exploration | |
| ICJ | International Court of Justice (UN) | |
| ICO | International Coffee Organization | |
| IDA | International Development Association (IBRD affiliate, UN) | |
| IDB | Inter-American Development Bank | |
| IDB | Islamic Development Bank | |
| IEA | International Energy Agency (associated with OECD) | |
| IFAD | International Fund for Agricultural Development (UN) | |
| IFC | International Finance Corporation (IBRD affiliate, UN) | |
| IHO | International Hydrographic Organization | |
| ILO | International Labor Organization (UN) | |
| ILZSG | International Lead and Zinc Study Group | |
| IMF | International Monetary Fund (UN) | |
| IMO | International Maritime Organization (UN) | |
| INRO | International Natural Rubber Organization | |
| INTELSAT | International Telecommunications Satellite Organization | |
| INTERPOL | International Criminal Police Organization | |
| IOOC | International Olive Oil Council | |
| IPU | Inter-Parliamentary Union | |
| IRC | International Rice Council | |
| ISO | International Sugar Organization | |
| ITC | International Tin Council | |
| ITU | International Telecommunication Union (UN) | |
| IWC | International Whaling Commission | |
| IWC | International Wheat Council | |
| L | . . . | Lake Chad Basin Commission |
| LAIA | Latin American Integration Association | |
| M | . . . | Mano River Commission |
| . . . | Mekong Committee | |
| N | . . . | Niger River Commission |
| NAM | Nonaligned Movement | |
| NATO | North Atlantic Treaty Organization | |
| . . . | Nordic Council |
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