| G&A | General And Administrative | - | Business and Finance |
| G- IV | Gulfstream IV | - | Business and Finance |
| G-M | Gent-McWilliams Parameterization Scheme | - | Business and Finance |
| G-TUF | G-Tunnel Underground Facility | - | Business and Finance |
| G/T | Activity Per Ton | - | Business and Finance |
| GA | Billion Years Unit | - | Business and Finance |
| GAARS | Global Atmospheric Aerosol And Radiation Study | - | Business and Finance |
| GAAS | Gallium Arsenide | - | Business and Finance |
| GAC | Global Atmospheric Chemistry | - | Business and Finance |
| GAC | Global Area Coverage | - | Business and Finance |
| GADMAP | GATE Aircraft Data Management Program | - | Business and Finance |
| GAGE | Global Atmospheric Gases Experiment | - | Business and Finance |
| GAGE | Gulf-Stream Atmospheric Gradient Exchange | - | Business and Finance |
| GAIM | Global Analysis | - | Business and Finance |
| GAINS | Global Air-ocean IN-situ System | - | Business and Finance |
| GAL | Galileo | - | Business and Finance |
| GALA | Geoscience Airborne Laser Altimeter | - | Business and Finance |
| GALE | Genesis Of Atlantic Lows Experiment | - | Business and Finance |
| GAMETAG | Global Atmospheric Measurements Experiment On Tropospheric Aerosols And Gases | - | Business and Finance |
| GAMIT | Not An Acronym | - | Business and Finance |
| GAMP | Global Atmospheric Measurements Program | - | Business and Finance |
| GAO | General Accounting Office | - | Business and Finance |
| GAP | GATE Advisory Panel | - | Business and Finance |
| GAP | GATE Advisory Panel | - | Business and Finance |
| GAPEX | Ground-based Atmospheric Profiling Experiment | - | Business and Finance |
| GAPS | Billions (109) Of Actions Per Second | - | Business and Finance |
| GARDIAN | GBL Point Defense System | - | Business and Finance |
| GARP | Global Atmospheric Research Program | - | Business and Finance |
| GARP | GEMPAK Analysis And Rendering Program | - | Business and Finance |
| GARP | Global Atmospheric Research Program | - | Business and Finance |
| GAT | General Aviation Transponder | - | Business and Finance |
| GATE | Global Atmospheric Research Programme Atlantic Tropical Experiment | - | Business and Finance |
| GATT | General Agreement On Tariffs And Trade | - | Business and Finance |
| GAU | General Accounting Unit | - | Business and Finance |
| GAW | Global Atmospheric Watch | - | Business and Finance |
| GB | Gigabyte | - | Business and Finance |
| GB | Gigabits | - | Business and Finance |
| GBDS | GARP Basic Data Set | - | Business and Finance |
| GBPS | Gigabity (109) Per Second | - | Business and Finance |
| GBYTE | Gigabyte (109) | - | Business and Finance |
| GC | Gas Chromatograph | - | Business and Finance |
| GC-AED | Gas Chromatography-Atomic Emission Detection | - | Business and Finance |
| GCA | Geophysics Corporation Of America | - | Business and Finance |
| GCCDF | Generic Control Center Development Facility | - | Business and Finance |
| GCCM | Global Carbone Cycle Modeling | - | Business and Finance |
| GCDIS | Global Change Data And Information System | - | Business and Finance |
| GCE | Part Of EUROTRAC | - | Business and Finance |
| GCEC | Global Change And Ecological Complexity | - | Business and Finance |
| GCI | Global Change Institute | - | Business and Finance |
| GCIP | GEWEX Continental-Scale International Project | - | Business and Finance |
| GCM | General Circulation Model | - | Business and Finance |
| GCM | Global Change Model | - | Business and Finance |
| GCM | General Circulation Model | - | Business and Finance |
| GCMC | Global Climate Modeling Group | - | Business and Finance |
| GCMG | Global Climate Modeling Group | - | Business and Finance |
| GCMG | Global Climate Modeling Group | - | Business and Finance |
| GCOS | Global Climate Observing System | - | Business and Finance |
| GCP | Global Chemistry Program | - | Business and Finance |
| GCP | Global Change Program | - | Business and Finance |
| GCP | GEWEX Continental-Scale Project | - | Business and Finance |
| GCRP | Global Change Research Program | - | Business and Finance |
| GCSS | GWEX Cloud Systems Studies | - | Business and Finance |
| GCTE | Global Change And Terrestrial Ecosystems | - | Business and Finance |
| GCTE | Global Change And Terrestrial Ecosystems | - | Business and Finance |
| GCTM | Global Chemical Transport Model | - | Business and Finance |
| GDAS | Global Data Assimilation System | - | Business and Finance |
| GDC | GARP Data Center | - | Business and Finance |
| GDP | GARP Data Processing | - | Business and Finance |
| GDP | Ground Data Processor | - | Business and Finance |
| GDP | Gross Domestic Product | - | Business and Finance |
| GDP | Government Development Platforms | - | Business and Finance |
| GDPS | Global Data Processing System | - | Business and Finance |
| GDR | Geophysical Data Record | - | Business and Finance |
| GDS | Global Dynamics Section | - | Business and Finance |
| GDS | GeoMet Data Services | - | Business and Finance |
| GED | Global Ecosystem Dynamics | - | Business and Finance |
| GEF | Global Environmental Facility | - | Business and Finance |
| GEIA | Global Emissions Inventory Activity | - | Business and Finance |
| GEISA | Management And Study Of Atmospheric Spectroscopic Information | - | Business and Finance |
| GEM | Global Environmental Multiscale Model | - | Business and Finance |
| GEM | Geospace Environment Modeling Program | - | Business and Finance |
| GEMINI | General Mesonetwork Interpolation Interface | - | Business and Finance |
| GEMPAK | General Meteorological Package | - | Business and Finance |
| GEMS | Global Environment Monitoring System | - | Business and Finance |
| GENESIS | Global Environmental And Ecological Simulation Of Interactive Systems | - | Business and Finance |
| GENPRO | General Processor | - | Business and Finance |
| GEO | Geosciences Directorate | - | Business and Finance |
| GEO 2000 | National Science Foundation's Geosciences Beyond 2000 | - | Business and Finance |
| GEOS | Geostationary Earth-Orbiting Satellite | - | Business and Finance |
| GEOSAT | Geodesy Satellite | - | Business and Finance |
| GEOSECS | Geochemical Ocean Sections | - | Business and Finance |
| GEOSIF | Geoscientific Information Framework | - | Business and Finance |
| GEU | Gyro Electronics Unit | - | Business and Finance |
| GEWEX | Global Energy And Water Cycle Experiment | - | Business and Finance |
| GEWEX | Continental-Scale Project | - | Business and Finance |
| GF | Gigaflops | - | Business and Finance |
| GFDL | Geophysical Fluid Dynamics Laboratory | - | Business and Finance |
| GFE | Government Furnished Equipment | - | Business and Finance |
| GFLOPS | Gigaflops | - | Business and Finance |
| GFP | Government Furnished Property | - | Business and Finance |
