| Abbreviation | Definition |
|---|---|
| GSPC | Global Strategy for Plant Conservation |
| GSQM | Global Supplier Quality Manager |
| GSR | Galvanized Skin Response |
| GSRP | Ground Safety Review Panel |
| GSS | Ground Support System |
| GSS | Ground Support Software |
| GSSA | Ground Support Systems Activation |
| GSSC | Ground Support Systems Contractor |
| GSSC | Ground Support Simulation Computer |
| GSSI | Ground Support System Integration |
| GST | Ground System Test |
| GST | Greenwich Sidereal Time |
| GSTDN | Ground Spacecraft Tracking and Data Network |
| GSTDN | Ground Space Flight Tracking and Data Network |
| GSTF | Ground Systems Test Flow |
| GSTP | Global System of Trade Practices |
| GSW | Gunshot wound |
| GT | Greater Than |
| GT | Go To |
| GT | Glucose Tolerance |
| GT | Graph Theorist |
| GTA | Ground Torquing Assembly |
| GTA | Ground Test Article |
| GTA | Ground Test Access |
| GTA | Gas Tungsten Arc |
| GTAS | Generic Testing and Analysis System |
| GTAW | Gas Tungsten Arc Welding |
| GTB | Gastrointestinal Tract Bleeding |
| GTC | Ground Test Conductor |
| GTC | Glycol Trim Console |
| GTCP | Global Tropospheric Chemistry Program |
| GTCS | Generalized Tonic-Clonic Seizures |
| GTCU | Ground Thermal Conditioning Unit |
| GTD | Glyoxal Trimeric Dihydrate |
| GTDS | Goddard Trajectory Determination System |
| GTE | Greater Than Or Equal |
| GTF | Generalized Timing Formula |
| GTF | Glucose Tolerance Factor |
| GTI | Ground Test Instrumentation |
| GTJ | Go To Jail |
| GTM | Gratuitous Tactile Moments |
| GTM | Ground Test Motor |
| GTM | Ground Team Manager |
| GTN | Glyceryl TriNitrate |
| GTN | Gestational Trophoblastic Neoplasia |
| GTO | Geo-synchronous Transfer Orbit |
| GTO | Golgi Tendon Organs |
| GTO | Geostationary Transfer Orbit |
| GTO | Great Teacher Onizuka |
| GTOS | Global Terrestrial Observing System |