| Abbreviation | Definition |
|---|---|
| GRTLS | Glide Return To Launch Site |
| GRTS | Grants Reporting and Tracking System |
| GS | Gas Servicer |
| GS | Ground Speed |
| GS | Ground System |
| GSAT | Global SATellite |
| GSCU | Ground Service Cooling Unit |
| GSDL | Ground Software Development Laboratory |
| GSE | Geocentric Solar Ecliptic |
| GSE | Ground Servicing Equipment |
| GSE | Ground Support Electronics |
| GSEL | Ground Support Equipment List |
| GSF | Global Spectral Forecast |
| GSFC | Goddard Space Flight Center |
| GSI | Glide Slope Indicator |
| GSI | Government Source Inspection |
| GSIRD | Ground Data System Information Requirements Document |
| GSIU | Ground Standard Interface Unit |
| GSLV | Geosynchronous Satellite Launch Vehicle (ISRO) |
| GSO | Global Space Organization |