| Acronym | Meaning |
 | IAEA | International Atomic Energy Agency |
| IAG | International Association Of Geodesy |
| IAG | Interagency Agreement |
| IAG | Instrumentation Advisory Group |
| IAGA | International Association Of Geomagnetism And Aeronomy |
| IAGW | International Acoustic Gravity Waves |
| IAHS | International Association Of Hydrological Sciences |
| IAMAPS | International Association Of Meteorology And Atmospheric Physics Sciences |
| IAMAS | International Association Of Meteorology And Atmospheric Sciences |
| IAP | International Affiliates Program |
| IAPO | International Association Of Physical Oceanography |
| IAPSO | International Association Of Physical Sciences Of The Ocean |
| IARP | International Atmospheric Research Program |
| IAS | Indicated Air Speed |
| IASH | International Association Of Scientific Hydrology |
| IASP | International Atmospheric Surveillance Program |
| IASPEI | International Association Of Seismology And Physics Of The Earth's Interior |
| IATO | Independent Acceptance Test Organization |
| IAU | International Astronomical Union |
| IAV | International Association Of Volcanology |
| IAVCEI | International Association Of Volcanology And Chemistry Of The Earth's Interior |
| IAWSP | Intergrated Aviation Wind Shear Plan |
| IBM | International Business Machines Corporation |
| IBM AT | IBM Advanced Technology Personal Computer |
| IBM PC | Generic Term For IBM Personal Computers |
| IBM PS/2 | One Class Of IBM Personal Computers |
| IBM RT | The IBM RISC Technology Computer System |
| IBRD | International Bank For Reconstruction And Development |
| ICA | International Central Archive |
| ICAMR | Interdepartmental Committee On Applied Meteorological Research |
| ICAO | International Civil Aviation Organization |
| ICAR | International Cooperation In Aviation Research |
| ICAS | Interdepartmental Committee On Atmospheric Science |
| ICAS | Interdepartmental Communication For Atmospheric Science |
| ICC | Instrument Control Center |
| ICCP | International Commission Of Clouds And Precipitation |
| ICD | Interface Control Document |
| ICDM | International Commission On Dynamic Meteorology |
| ICE | Intercomparison Experiment |
| ICE | Isoprene Closure Experiment |
| ICE | Isoprene Canopy Experiment |
| ICE | International Cirrus Experiment |
| ICECOLORS | Cold Water Component Of WATERCOLORS |
| ICES | International Council For The Exploration Of The Sea |
| ICEX | Ice Experiment |
| ICF | Instrument Control Facility |
| ICFD | Institute For Computational Fluid Dynamics |
| ICG | International Coordination Group |
| ICH | Inter-Union Commission On The Lithosphere |
| ICH | Inter-Union Commission On The Lithosphere |
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