| Abbreviation | Definition |
|---|---|
| IGBP-DIS | IGBP Data and Information System |
| IGBP-DIS | International Geosphere Biosphere Program - Data and Information System |
| IG-GCI | International Geological - Geophysical Cruise Inventory |
| IG-GCI | International Geological- Geophysical Cruise Inventory |
| IGM | Interplanetary Global Model |
| IGOM | Integrated Global Ocean Monitoring |
| I-GOOS | IOC-WMO-UNEP Committee for the Global Ocean Observing System |
| IGOSS | Integrated Global Ocean Services System |
| IGP | Igneous and Geothermal Process |
| IGP | Igneous and Ggeothermal Processes |
| IGS | Inner Gulf Shelf |
| IGS | International Glaciological Society |
| IGSP | International Greenland Sea Project |
| IGY | International Geophysical Year |
| IHB | International Hydrographic Bureau |
| IHO | International Hydrographic Organization |
| IIASA | International Institute for Applied Systems Analysis |
| IIOE | International Indian Ocean Expedition |
| IITA | Information Infrastructure Technology Applications |
| IITF | Information Infrastructure Task Force |