| Abbreviation | Definition |
|---|---|
| GCM | Global Climate Model |
| GCRP | Global Change Research Program |
| GD | Global Depth |
| GDF | Geographic Data Files |
| GDL | Glow Discharge Laboratory |
| GDPS | Geographically Dispersed Parallel Sysplex |
| GEMS | Global Environmental Monitoring System |
| GEO | Global Environmental Outlook |
| GES | Geophysics Electromagnetic Shadow phenomena |
| GES1 | Geophysics Electromagnetic Shadow phenomena: Eclipse Shadow Bands |
| GES2 | Geophysics Electromagnetic Shadow phenomena: Moving Shadow Bands in the Atmosphere |
| GES3 | Geophysics Electromagnetic Shadow phenomena: Colored Shadows |
| GES4 | Geophysics Electromagnetic Shadow phenomena: Shadow Bands Seen Through the Telescope |
| GES5 | Geophysics Electromagnetic Shadow phenomena: Unusual Shadows Observed during Eclipses |
| GES6 | Geophysics Electromagnetic Shadow phenomena: Non-Eclipse Shadow Bands |
| GES7 | Geophysics Electromagnetic Shadow phenomena: Persistent or Living Shadows |
| GES8 | Geophysics Electromagnetic Shadow phenomena: Curious Mountain Shadows |
| GFMPL | Geophysical Fleet Mission Program Library |
| GFS | Global Forecast System |
| GFS | Global Forecasting System |