| Abbreviation | Definition |
|---|---|
| IDN | International Directory Network |
| IDOE | International Decade of Ocean Exploration |
| IEA-OES | International Energy Agency’s Ocean Energy Systems |
| IEA-OES | International Energy Agencys Ocean Energy Systems |
| IECS | Institute of Estuarine and Coastal Studies |
| IESE | Ice Extent in the Strata, East |
| IESW | Ice Extent in the Strata, West |
| IFA | Intensive Flux Array |
| IFB | Invitation For Bid |
| IFEN | Institut fran?ais de l'environnement |
| IFEN | Institut Francais de l'ENvironnement |
| IFIAS | International Federation of Institutes for Advanced Study |
| IFO | Identified Floating Object |
| IFOP | Instituto de Fomento Pesquero |
| IFREMER | Institut fran?ais de r?cherche pour l'exploitation de la mer |
| IFREMER | Institut Francais de Recherche pour l'Exploitation de la MER |
| IFS | International Foundation for Science |
| IFYGL | International Field Year for the Great Lakes |
| IGAC | International Global Atmospheric Chemistry Program |
| IGBP | International Geosphere Biosphere Program |