| Abbreviation | Definition |
|---|---|
| GPIEM | International Marine Environment Award |
| GPO | Government Printing Office |
| GPRA | Government Performance and Results Act |
| GRASS | Geographic Resources Analysis Support System |
| GRASS | Grandmas Rachit Ass Samsung Sucks |
| GRC | Gulf Research Center |
| GREAT | Gorda Ridge Eruption Assessment Team |
| GRID | Global Resource Information Database |
| GRIP | Greenland Icesheet Program or Greenland Icecore Project |
| GRM | Geophysical Research Mission |
| GS | Gulf Shelf |
| GSA | Great Salinity Anomaly |
| GSAT | Global Satellite Data Acquisition Team |
| GSC | Ground Slope Category |
| GSE | Ground Support Equipment |
| GSFC | Goddard Space Flight Center |
| GSO | Graduate School of Oceanography |
| GST | GPS Science and Technology |
| GTN | Global Trends Network |
| GTOS | Global Terrestrial Observing System |