| Abbreviation | Definition |
|---|---|
| ICRSDT | International Committee on Remote Sensing and Data Transmission |
| ICSEAF | International Commission for the South-East Atlantic Fisheries |
| ICSEM | International Commission for the Scientific Exploration of the Mediterranean Sea |
| ICSI | International Commission on Snow and Ice |
| ICSPRO | Inter-Secretariat Committee on Scientific Programs Relating to Oceanography |
| ICSU | International Council for Science |
| ICSZ | Ice Covered Shelf Zone |
| ICTP | International Center for Theoretical Physics |
| ICV | Interdecadal Climate Variability |
| ICWF | Interactive Computer Worded Forecast |
| ICWG | International Coordination Working Group |
| ICWWP | Interagency Committee for the World Weather Program |
| ICZM | Integrated Coastal Zone Management |
| IDA | Institute for Defense Analyses |
| IDAP | Ice Data Acquisition Program |
| IDCA | International Dolphin Conservation Agreement |
| IDEAS | International Decade of Exploration and Assessment of the Seas |
| IDIDAS | Interactive Digital Image Display and Analysis System |
| IDL | Interactive Data Language |
| IDMS | International Directory of Marine Scientists |