| Abbreviation | Definition |
|---|---|
| GAIA | Global Astrometric Interferometer For Astrophysics |
| GAIN | Graphic Aids for Investigating Networks |
| GALE | Giant Aperture Lidar Experiment |
| GAM | GAMma |
| GAP | GOAL (Ground Operations Aerospace Language) Automatic Procedure |
| GAPL | Group Assembly Parts List |
| GAS | GetAway Special |
| GASP | General Aerodynamics Simulation Program |
| GASPI | Guidance Attitude Space Position Indicator |
| GATP | Ground Acceptance Test Procedure |
| GATT | Gate Assisted Turnoff Thyristor |
| GAUSS | Galileo And Umts Synergetic System |
| GBI | Grand Bahama Island |
| GBL | Great Big Lever |
| GBR | Glass Bead Rating |
| GBRS | Generic Block Recording System |
| GBS | Ground-Based Software |
| GBU | Ground Based Unit |
| GC | GigaCycles |
| GC | Global Catalog |