| Abbreviation | Definition |
|---|---|
| GE | Grass Eater |
| GFARAD | Global Food Animal Residue Avoidance Databank |
| GGA | Global Gecko Association |
| GISC | General Insurance Standards Council |
| GL | Glycemic Loading |
| GLW | Green LaceWings (Neuroptera: Chrisopidae) (insect) |
| GMAC | Genetic Manipulation Advisory Committee (Australia - obsolete, now GTTAC) |
| GOA | Geldings Of America |
| GOC | General Optical Council (human, UK) |
| GPVEC | Great Plains Veterinary Education Center |
| GPVEC | Great Plains Veterinary Educational Center |
| GPVEC | Great Plains Veterinary Educational Center (University of Nebraska) |
| GR | Golden Retriever |
| GRFG | Green Frog |
| GS | German Shepherd |
| GSD | German Shepherd Dog |
| GSI | GonadoSomatic Index |
| GSL | General Sales List |
| GSL | General Sales List (legal category of drugs) |
| GTAC | Gene Therapy Advisory Committee |