| Acronym | Meaning |
 | ICITA | International Cooperative Investigation Of The Tropical Atlantic |
 | ICITA | International Cooperative Investigation Of The Tropical Atlantic |
 | ICJOB | IBM-to-Cray Interactive Interface |
 | ICMAP | CSMP |
 | ICMSSR | Interagency Committee For Meteorological Services And Supporting Research |
 | ICMUA | IAMAS Commission On The Meteorology Of The Upper Atmosphere |
 | ICN | International Communications Network |
 | ICO | Interagency Committee On Oceanography |
 | ICO | Initial Operating Capability |
 | ICPM | International Commission On Polar Meteorology |
 | ICS | Intercom System |
 | ICS | Interdisciplinary Climate Systems |
 | ICSI | International Commission On Snow And Ice |
 | ICSU | International Council Of Science |
 | ICWF | Interactive Computer Worded Forecast |
 | ICWG | International Coordinating Working Group |
 | ICWWP | Interagency Committee For World Weather Programs |
 | ID | Inside Diameter |
 | IDA | Institute For Defense Analysis |
 | IDASS | Integrated Data Assimilation/Sounding System |
 | IDB | Immediate Direct Broadcast |
 | IDCS | Image-dissector Camera System |
 | IDD | Internet Data Distribution |
 | IDD | Interface Definition Document |
 | IDEA LAB | Interactive's Digital Environmental Analysis Lab |
 | IDEAS | Instrumentation Development And Education In Airborne Science |
 | IDI | Instrumentation Development And Intercomparisons |
 | IDL | Interactive Display Language |
 | IDL | Interactive Data Language |
 | IDL | Interface Definition Language |
 | IDNDR | International Decade For Natural Disaster Reduction |
 | IDNHR | International Decade Of Natural Hazard Reduction |
 | IDOE | International Decade Of Ocean Exploration |
 | IDR | Incremental Design Review |
 | IDS | Interdisciplinary Study |
 | IDS | International Data Service |
 | IEA | International Energy Agency |
 | IEE | Institute Of Electrical Engineers |
 | IEEE | Institute Of Electrical And Electronic Engineers |
 | IEF | Inventory Exchange Format |
 | IEIS | Integrated Earth Information Server |
 | IERS | International Earth Rotation Service |
 | IF | Intermediate Frequency |
 | IF | In-flight |
 | IFA | Intensive Flux Array |
 | IFAW | International Fund For Animal Welfare |
 | IFC | Intensive Field Campaign |
 | IFC | InFlight Black Body Calibrator |
 | IFD | Indirect Flare Detector |
 | IFD | In-flight Deployment |