| Abbreviation | Definition |
|---|---|
| GISS | Goddard Institute for Space Studies |
| GITG | Ground Interface Technical Group |
| GIWG | Ground Interface Working Group |
| GLA | General Luminary Assembly |
| GLAADS | Gun Low Altitude Air Defense System |
| GLAST | Gamma-ray Large Area Space Telescope |
| GLC | Generator Line Contractor |
| GLD | GLiDe Slope |
| GLL | GaLiLeo |
| GLO | Goddard Launch Operations |
| GLO | Ground Logistics Operations |
| GLOM | Gross Lift-Off Mass |
| GLOPAC | Gyroscopic LOw-Power Attitude Control |
| GLOV | GLobal Observational Vehicle |
| GLOW | Goddard Lidar Observatory For Wind |
| GLOW | Gross Lift-Off Weight |
| GLOW | Ground Lift-Off Weight |
| GLP | Goal Language Processor |
| GLRSHLD | GLaRe SHieLd |
| GLS | Ground Launch Sequence |