| I |
| IA-ECOSOC | Inter-American Economic and Social Council. |
| IAEA | International Atomic Energy Agency. |
| IAFP | Inter-American Forces of Peace. |
| IANEC | Inter-Americn Nuclear Energy Commission. |
| IARA | Inter-Allied Reparation Agency. |
| IATA | International Air Transport Association. |
| IBD | Inter-American Development Bank. |
| IBEC | International Bank for Economic Co-operation. |
| IBM | International Business Machines Corporation. |
| IBRD | International Bank for Reconstruction and Development. |
| ICA | International Communication Agency. |
| ICAO | International Civil Aviation Organization. |
| ICBM | Inter-Continental-Ballistic Missiles. |
| ICC | International Chamber of Commerce. |
| ICCS | International Commissions for Control and Supervision. |
| ICFTU | International Confederation of Free Trade Unions. |
| ICJ | International Court of Justice. |
| ICSID | International Centre for Settlement of Investment Disputes. |
| IDA | International Development Association. |
| IDS | International Development Strategy. |
| IFAD | International Fund of Agricultural Development. |
| IFC | International Finance Corporation. |
| IFCTU | International Federation of Chrisian Trade Unions. |
| IGAT | Iranian Gas Trunkline. |
| IIB | International Investment Bank. |
| ILO | International Labour Organization. |
| IMF | International Monetary Fund. |
| IMO | International Meteorological Organization. |
| IMO | International Maritime Organization. |
| IMT | International Military Tribunal. |
| INCB | International Narcotics Control Board. |
| INCIDI | Institute of Differing Civilization. |
| INFOTERM | International Information Centre for Technology. |
| INIS | International Nuclear Information System. |
| INMARSAT | Intrernational Maritime Satellite Organization. |
| INSTRAW | International Research and Training Institute for the Advancement of Women. |
| INTERAMPOL | Inter-American Police. |
| INTERCOSMOS | International Space Exploration Program. |
| INTERFLORA | International Organization for Flowers'Deliveries. |
| INTERLAINE | Committee for the Wool Industries. |
| INTERLIGHTER | International Interland Shipping Enterprise. |
| INTERMETAL | International Organization for Co-operation in the Iron and Steel Industry. |
| INTERVISION | International Television Organization. |
| IOB | Inter-Organization Information Board. |
| IPDC | International Program for the Development of Communication. |
| IPL | Information Processing Language. |
| IPU | Inter-Parliamentary Union. |
| IRA | Irish Republican Army. |
| ISBN | International Standard Book Number. |
| ITO | International Trade Organization. |
| ITU | International Telecommunication Union. |
| K |
| KWIC | Key Word in Context. |
| KWOC | Key Word Out of Context. |
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