| Acronym | Meaning |
| GSO | Ground Support Operations |
| GSO | Ground Systems Operations |
| GSS | Ground Support Software |
| GSS | Ground Support System |
| GSSA | Ground Support Systems Activation |
| GSSC | Ground Support Simulation Computer |
| GSSC | Ground Support Systems Contractor |
| GSSI | Ground Support System Integration |
| GST | Ground System Test |
| GSTAR | General Satellite (ELV) |
| GSTDN | Ground Space Flight Tracking And Data Network |
| GSTDN | Ground Space Flight Tracking And Data Network |
| GSTDN | Ground Spacecraft Tracking And Data Network |
| GSTF | Ground Systems Test Flow |
| GSU | Gas Servicer Unit |
| GSVP | Ground Support Verification Plan |
| GT | Greater Than |
| GT | Ground Team |
| GT | Ground Test |
| GT | Gyro Torque |
| GT&A | Ground Test And Acceptance |
| GTA | Gas Tungsten Arc |
| GTA | Ground Test Access |
| GTA | Ground Test Article |
| GTA | Ground Torquing Assembly |
| GTC | Glycol Trim Console |
| GTC | Ground Test Conductor |
| GTCU | Ground Thermal Conditioning Unit |
| GTI | Grand Turk Island |
| GTI | Ground Test Instrumentation |
| GTM | Ground Team Manager |
| GTM | Ground Test Motor |
| GTS | General Test Support |
| GTS | GN&C Test Station |
| GTS | GNS Test Station |
| GTU | Glycol Trim Unit |
| GUCP | Ground Umbilical Carrier Plate |
| GUID | Guidance |
| GUIDO | Guidance Officer |
| GUL | GSE Utilization List |
| GUSB | Guided Unified S-Band |
| GVA | GOX Vent Arm |
| GVO | Gaviota (TACAN Station) |
| GVT | Ground Vibration Test |
| GVTA | Ground Vibration Test Article |
| GW | Gross Weight |
| GWA | General Work Area |
| GWM | Guam (STDN) |
| GWT | Ground Winds Tower |
| GYM | Guaymas |