| Abbreviation | Definition |
|---|---|
| GLOW | Guiding Lives Organically Worldwide |
| GLW | Great Lakes Water |
| GLWD | Global Lakes and Wetlands Database |
| GLWQ | GrassLand Water Quality |
| GLWQ | Great Lakes Water Quality |
| GLWQA | Great Lakes Water Quality Agreement |
| GLWQP | Great Lakes Water Quality Program |
| GMES | Global Monitoring for Environmental Security |
| GMNV | Generalized Monotonicity No Veto |
| GMP | Good Manufacturing Practice |
| GMS | Growth Management Services |
| GMWR | Groundwater Monitoring Well Report |
| GNET | Global Network For Environmental Technology |
| GNSS4SWEC | Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate |
| GOB | Garbage Off Bituminous |
| GOER | Global Operational Environmental Review |
| GOES | Geostationary Operational Environmental Satellites |
| GOES | Geosynchronous Operational Environmental Satellite |
| GOMA | Gulf of Mexico Alliance |
| GOMT | Gulf of Maine Times |