| 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 |