| Abbreviation | Definition |
|---|---|
| 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 |
| GTAS | Generic Testing and Analysis System |
| GTC | Glycol Trim Console |
| GTC | Ground Test Conductor |
| GTCU | Ground Thermal Conditioning Unit |
| GTDS | Goddard Trajectory Determination System |
| GTI | Grand Turk Island |
| GTI | Ground Test Instrumentation |
| GTM | Ground Team Manager |
| GTM | Ground Test Motor |
| GTO | Geostationary Transfer Orbit |
| GTO | Great Teacher Onizuka |