| Abbreviation | Definition |
|---|---|
| GLOBEC | Global Ocean Ecosystems Dynamics or Global Ocean-Ecosystem Coupling |
| GLODA | Global Ocean Data Analysis |
| GLODA | Global Ocean Data Analysis |
| GLOSS | Global Sea Level Observing System |
| GLWD | Global Lakes and Wetlands Database |
| GMCC | Geophysical Monitoring for Climatic Change |
| GMDSS | Global Maritime Distress and Safety System |
| GMIS | Grants Management Information System |
| GMRI | Gulf of Maine Research Institute |
| GMS | Geostationary Meteorological Satellite |
| GMSL | Global Mean Sea Level |
| GMT | Generic Mapping Tool |
| GN | Gill Net |
| GNSS | Global Navigation Satellite System) |
| GO3OS | Global Ozone Observing System |
| GOA | Gulf of Alaska |
| GOALS | Global Ocean-Atmosphere-Land System |
| GOCB | Great Ocean Conveyor Belt (climate) |
| GODAE | Global Ocean Data Assimilation Experiment |
| GOES | Geostationary Operational Environmental Satellite |