| Abbreviation | Definition |
|---|---|
| INAMHI | Instituto Nacional de Meteorolog?a e Hidrolog?a |
| INAMHI | Instituto NAcional de Meteorologia e HIdrologia |
| INAPE | Instituto Nacional de Pesca |
| INDIGO | Indian Ocean Geochemistry |
| INDOEX | Indian Ocean Experiment |
| INEL | Idaho National Engineering Laboratory |
| INFIS | Indonesian Aquatic Sciences and Fisheries Information System |
| INFOCLIMA | World Climate Data Information Referral Service |
| INMARSAT | International Maritime Satellite Organization |
| INMG | National Institute of Meteorology and Geophysics |
| INO | Institute for Naval Oceanography |
| INPFC | International North Pacific Fisheries Commission |
| INQUA | International Union for Quaternary Research |
| INSAT | Indian Geostationary Satellite |
| INSRP | Interagency Nuclear Safety Review Panel |
| INSS | Irish National Seabed Survey |
| INTECMAR | Instituto de Tecnolog?a y Ciencias Marinas |
| INTECMAR | INstituto de TEcnología y Ciencias MARinas |
| INTELSAT | International Telecommunications Satellite Consortium |
| IO | Indian Ocean |