| Acronym | Meaning |
 | GALCIT | Guggenheim Aeronautical Laboratory |
| GANGY | Green Anorak |
| GAO | U.S. Government Accountability Office |
| GAW | Global Atmospheric Watch |
| GB | Gabon (FIPS 10-4 Country Code) - United Kingdom Of Great Britain And Northern Ireland (ISO 3166 Digram) |
| GBBC | Great Backyard Bird Count |
| GBE | Knight/Dame Grand Cross Of The Order Of The British Empire |
| GBH | Grievous Bodily Harm |
| GBP | United Kingdom Pound Sterling (ISO 4217 Currency Code) |
| GBR | United Kingdom Of Great Britain And Northern Ireland (ISO 3166 Trigram) |
| GBU | Glide-Bomb Unit - Global Business Unit |
| GC | East Germany (NATO Country Code; Obsolete 1990) -General Counsel -Gigacoulomb |
| GCCS | Global Command And Control System (geeks) |
| GCD | See Entry |
| GCF | Greatest Common Factor |
| GCI | Ground-controlled Interception |
| GCN | Gamma-ray Burst Coordination Network |
| GCS | Global Coordinate System |
| GCSE | General Certificate Of Secondary Education (UK) |
| GD | Gadolinium |
| GD | Grenada (ISO 3166 Digram) |
| GD | Scottish Gaelic Language (ISO 639-1 Code) |
| GDC | Game Developers Conference |
| GDC | General Dental Council |
| GDL | Game Definition Language |
| GDP | General Dental Practitioner (UK) - Gross Domestic Product |
| GDR | General Distribution Release (Microsoft Term For A Software Service Release; Between Hotfix And Service Pack) |
| GDR | German Democratic Republic (cf. DDR) |
| GDW | Game Designers Workshop |
| GE | General Electric - Genetic Engineering (cf. GM) -Georgia (ISO 3166 Digram) |
| GE | Germanium |
| GEBCO | General Bathymetric Chart Of The Oceans |
| GEC | Great Engineering Challenge |
| GED | General Education Development |
| GEEP | Geophysical Equipment Exploration Platform |
| GEL | Georgian Lari (ISO 4217 Currency Code) - Gilbert And Ellice Islands (ISO 3166 Trigram; Obsolete 1977) |
| GEMA | Gas And Electricity Markets Authority - Georgia Emergency Management Agency -Gesellschaft Fr Musikalische Auffhrungs- Und Mechanische Vervielf?ltigungsrechte (German Performance Rights Organisation) -Global Engine Manufacturing Alliance |
| GEN | Full General (four Stars) In The U.S. Army |
| GEO | Geostationary Earth Orbit -Georgia (ISO 3166 Trigram) |
| GEOS | Graphical Environment Operating System |
| GESTAPO | GEheime STAatsPOlizei (German Secret State Police) |
| GEV | Ground Effect Vehicle |
| GEV | Gigaelectron-volt |
| GF | French Guiana (ISO 3166 Digram) - Gigafarad |
| GFCI | Ground Fault Circuit Interruptor (aka GFI) |
| GFDL | GNU Free Documentation License |
| GFE | Girl Friend Experience (used In Escort Services) - Good Faith Estimate - Government Furnished Equipment |
| GFI | Ground Fault Interruptor (aka GFCI) |
| GFN | Global Footprint Network |
| GFY | Good For You Or Go Fuck Yourself |
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