| Acronym | Meaning |
 | GMS | Geostationary Meteorological Satellite |
| GMSA | Global Multivariate Statistical Analysis |
| GMT | Greenwich Mean Time |
| GMU | Gyro Mechanical Unit |
| GN | Ground Network |
| GN AND C | Guidance |
| GNSS | Ground Network Scheduling System |
| GNU | GNU's Not UNIX (a Recursive Acronym) |
| GOALS | Global Ocean-Atmosphere-Land System |
| GOASEX | Gulf Of Alaska Experiment |
| GOCC | GARP Operations Control Center |
| GOCO | Government Owned |
| GOES | Geostationary Operational Environmental Satellite |
| GOESTAP | N/A |
| GOEZS | Global Ocean Euphotic Zone Study |
| GOFS | Global Ocean Flux Study |
| GOM | Global Observations And Modeling Project |
| GOMOOS | Gulf Of Main Ocean Observing System |
| GOMOT | Global Observations |
| GOMR | Global Ozone Monitoring Radiometer |
| GONG | Global Oscillations Network Group |
| GOOS | Global Ocean Observing System |
| GOS | Global Observing System |
| GOS | Geomagnetic Observing System |
| GOSIP | Government Open Systems Interconnect Protocol |
| GOST | Goals Objectives Strategies Tactics |
| GOTS | GALE Oceanographic Temperature Studies |
| GPC | Global Processing Center |
| GPCP | Global Precipitation Chemistry Project |
| GPIB | General Purpose Interface Board |
| GPM | Geopotential Meter |
| GPO | Government Printing Office |
| GPP | Gross Primary Productivity |
| GPRA | Government Performance And Results Act |
| GPS | Global Positioning System |
| GPS | Geophysical Processor System |
| GPS | Grants Program Section |
| GPS CORS | Global Positioning System Continuously Operating Reference Stations |
| GPS-IPW | Global Positioning System-Integrated Precipitable Water |
| GPS/MET | GPS Meteorological Satellite |
| GPX | A Suffix Which Designates Graphics Capabilities On The DEC MicroVax System (typically Seen As DEC VAXstation/GPX.) |
| GRA | Graduate Research Assistant |
| GRACE | Gravity Recovery And Climate Experiment |
| GRAF | Gridded Representation Of Analyses And Forecasts |
| GRASP | Graphic Animation System For Professionals |
| GRD | Geophysics Research Directorate |
| GREM | Geopotential Research Explorer Mission |
| GRGC | Geologic Record Of Global Change |
| GRI | Gas Research Institute |
| GRIB | Grid In Binary |
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