| Abbreviation | Definition |
|---|---|
| GEDAC | General Electric Detection and Automatic Correction |
| GEM | Gas Expansion Module |
| GEM | General Equipment Module |
| GEMD | Ground Electronics Maintenance Division |
| GENOPAUSE | Geodetic Satellite in Polar Geosynchronous Orbit |
| GENSAA | Generic Spacecraft Analysis Assistant |
| GEOD | GEODetic |
| GEOSEPS | GEneral Operational Summary Edit Program |
| GEOSEPS | GEOsynchronous Solar Electric Propulsion Stage |
| GEOTAIL | Geologic MagnetoTAIL exploration satellite |
| GEOTAIL | Tail Laboratory |
| GERB | Geostationary Earth Radiation Budget experiment |
| GERP | GIMP Enhanced Robot Photographer |
| GERT | Graphical Evaluation and Review Technique |
| GESS | Goddard Experiment Support System |
| GESS | Graphics Executive Support System |
| GESYOT | GEnerate SYstem OutpuT |
| GET | Ground Elapsed Time |
| GETI | Ground Elapsed Time of Ignition |
| GETL | Ground Elapsed Time of Landing |