| Abbreviation | Definition |
|---|---|
| GRACE | Gravity Recovery and Climate Experiment |
| GRADE | Graphical Airspace Design Environment |
| GRAFTABL | load Graphics Characters higher than ASCII 127 |
| GRAIL | Gravitational Radiation Antenna In Leiden |
| GRAPHICS | allows Graphics to pass from screen to Printer |
| GRAS | Generally Regarded As Safe |
| GRB | Gamma Ray Bursts |
| GRB | Gamma Ray Burst |
| GRC | Glenn Research Center |
| GRDC | Global Runoff Data Centre |
| GRE | Generic Routing Encapsulation |
| GRE | Guaranteed Research Experience |
| GRE | Gamma Ray Explorer |
| GRE | Great River Energy |
| GRE | Guardian Royal Exchange |
| GRE | Ghastly and Repugnant Enormity |
| GRE | Genius Rocks Exam |
| GREAT | Groundwater Recovery Enhancement And Treatment |
| GREEN | Global Rivers Environment Education Network |
| GREF | General Reserve Engineer Force |
| GREP | Global Rinderpest Eradication Programme |
| GRH | Gonadotrophin Releasing Hormone |
| GRI | Graduate Of Realtor Institute |
| GRID | Gradual Retrograde Immune Degeneration |
| GRID | Graphic Retrieval and Information Display |
| GRID | Global Resource Information Database |
| GRIN | Germplasm Research Information Network |
| GRIP | Gamma Ray Imaging Payload |
| GRO | Gamma Ray Observatory |
| GROWN | Goods Raised Only With Nature |
| GRP | Gastrin Releasing Protein |
| GRR | Granule For Reconstitution |
| GRS | Gravitational Reference Sensor |
| GRS | Galaxy Rocket System |
| GRS | Gamma Ray Spectrometer |
| GRS | Great Red Spot |
| GRT | Gross Rated Tonnage |
| GRT | Germanium Resistance Thermometer |
| GRU | Glavnoye Razvedivatel'noye Upravileniye |
| GRWTAC | Groundwater Remediation Technologies Analysis Center |
| GS | General Studies |
| GS | Ground Station |
| GS | Ground Speed |
| GS | Glide Slope |
| GS | Gas Servicer |
| GS | Ground System |
| GSA | General Sales Agent |
| GSA | General Services Administration |
| GSC | Glandular Stress Complex |
| GSCU | Ground Service Cooling Unit |