| Abbreviation | Definition |
|---|---|
| GALE | Genesis of Atlantic Lows Experiment |
| GAM | Groundwater Availability Modeling |
| GAME | GEWEX Asian Monsoon Experiment |
| GAO | General Accounting Office |
| GARF | Geothermal Aquaculture Research Facility |
| GARP | Global Atmospheric Research Program |
| GASEX | Gas Exchange Experiment |
| GATE | GARP Atlantic Tropical Experiment |
| GATT | General Agreement on Tariffs and Trade |
| GAW | Global Atmospheric Watch |
| GBGLF | Georgian Bay Great Lakes Foundation |
| GBR | Great Barrier Reef |
| GBS | Gravity Base Structure |
| GBS | Great Big Sea |
| GBS | Great Big Spooge |
| GC | Gas Chromatograph |
| GC/MS | Gas Chromatography/Mass Spectrometry |
| GCC | Global Climatic Change |
| GCDIS | Global Change Data and Information System |
| GCFI | Gulf and Caribbean Fisheries Institute |