| GEAESD | General Electric Aerospace Electronics Systems | In English | → Electronics → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| GEAL | Galway Energy Agency Limited | In English | → Energy economics |
| GEAN | Genetic Engineering Action Network | In English | → Genetics → Biotechnology |
| GEAN | Georgia Environmental Action Network | In English | → Organizations and associations → Nature |
| GEB | Games and Economic Behavior | In English | → Serial publications, periodicals → Economics |
| GEC | General Electrodynamics Corporation | In English | → Electrical engineering |
| GEDA | Gauteng Economic Development Agency | In English | → Economics |
| GEDAC | General Electric Detection and Automatic Correction | In English | → Electrical engineering |
| GEF | Global Environment Facility | In English | → International relations → Nature → Environment, environmental sciences |
| GEF | Global Environmental Fund | In English | → Nature → Environment, environmental sciences |
| GEF | Global Exploration Fund | In English | |
| GELC | Global Education & Learning Community | In English | |
| GELLMU | Generalized Extensible LaTeX-Like MarkUp | In English | → Programming languages → Data |
| GEM | Generic Electronics Module | In English | → Electronics |
| GEM | Greenstar Energy Management | In English | → Energy economics |
| GEM | Geospace Environment Modeling | In English | → Earth sciences |
| GEM | Graphite Epoxy Motor | In English | → Vehicle engineering |
| GEM | Giotto Extended Mission | In English | → Spaceflight engineering, astronautics |
| GEMS | Global Environmental Monitoring System | In English | → Environment, environmental sciences |
| GEMS | Global Emergency Missile Surveillance | In English | → Military engineering |
| GEMS | General Energy Management System | In English | → Energy economics |
| GEN-AU | GENome research in AUstria | In English | → Biological sciences |
| GENI | Global Environnement for Network Innovations | In English | → Networks, communication |
| GEO | Gene Expression Omnibus | In English | → Genetics |
| GEO | Geosynchronous Earth Orbit | In English | → Spaceflight engineering, astronautics |
| GeocJ | Geochemical Journal | In English | → Serial publications, periodicals → Geochemistry |
| GEODSS | Ground-Based Electro-Optical Deep-Space Surveillance | In English | → Electrical engineering → Spaceflight engineering, astronautics |
| GEODSS | Ground-based Electro-Optical Deep-space Surveillance System | In English | → Spaceflight engineering, astronautics |
| GeoJ | Geophysical Journal | In English | → Serial publications, periodicals → Geophysics |
| GeoJI | Geophysical Journal International | In English | → Serial publications, periodicals → Geophysics |
| GeolJ | Geological Journal | In English | → Serial publications, periodicals → Earth sciences |
| GeoM | Geological Magazine | In English | → Serial publications, periodicals → Earth sciences |
| GeomJ | Geomicrobiology Journal | In English | → Serial publications, periodicals → 5507 → Palaeontology → Microbiology |
| GeoOM | Georgetown Observatory Monogram | In English | → Serial publications, periodicals → Astronomy |
| GeopP | Geophysical Prospecting | In English | → Serial publications, periodicals → Geophysics |
| GeopR | Geophysical References | In English | → Serial publications, periodicals → Geophysics |
| GeoRe | Georgetown Observatory Reprints | In English | → Serial publications, periodicals → Astronomy |
| GeoRL | Geophysical Research Letters | In English | → Serial publications, periodicals → Geophysics |
| GEOSC | GEOS Circular on Eclipsing Binaries | In English | → Serial publications, periodicals → Astronomy |
| GEOSEPS | Geosynchronous Solar Electric Propulsion Stage | In English | → Electrical engineering → Spaceflight engineering, astronautics |
| GeoSJ | Geological Society Journal | In English | → Serial publications, periodicals → Earth sciences |
| GEOSN | GEOS Note Circulaire | In English | → Serial publications, periodicals → Astronomy |
| GeoSu | Geophysical Surveys | In English | → Serial publications, periodicals → Geophysics |
| Geoth | Geothermics | In English | → Serial publications, periodicals → Earth sciences → Energy economics |
| GEP | Global Equity Partners | In English | → Finance |
| GERM | Geochemical Earth Reference Model | In English | → Geochemistry |
| GERT | Graphical Evaluation and Review Technique | In English | → Engineering, technology |
| GESAMP | Group of Experts on the Scientific Aspects of Marine Environmental Protection | In English | → Nature → Environment, environmental sciences |
| GESEAS | Göteborg (Centre for) East and Southeast Asian Studies | In English | → Area studies |
| GESEAS | Global Eagle Strategic Empowerment Alliance Systems | In English | → Organizations and associations |
| GESS | Goddard Experiment Support System | In English | |
| GET | Ground Elapsed Time | In English | |
| GETI | Ground Elapsed Time of Ignition | In English | → Vehicle engineering |
| GETL | Ground Elapsed Time of Landing | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| GETS | Ground Equipment Test Set | In English | |
| GF | Gauge Factor | In English | |
| GFAE | Government-Furnished Aircraft Equipment | In English | → Public administration, government → Aeronautics, aircraft |
| GFAE | Government-Furnished Aeronautical Equipment | In English | → Public administration, government → Aeronautics, aircraft |
| GFAP | Glial Fibrillary Acidic Protein | In English | → Biochemistry, biophysics |
| GFAP | General Framework Agreement for Peace | In English | → International relations → Polemology |
| GFC | Google Friends Connect | In English | → Internet |
| GFC | Gigabit Fiber Channel | In English | → Networks, communication |
| GFD | Government-Furnished Data | In English | → Data → Public administration, government |
| GFE | Government-Furnished Equipment | In English | → Public administration, government |
| GFERD | Government-Furnished Equipment Requirement Description | In English | → Public administration, government |
| GFI | Ground Fault Interrupter | In English | |
| GFI | Government-Furnished Information | In English | → Public administration, government |
| GFM | Government-Furnished Material | In English | → Public administration, government |
| GFMS | Georgian Foundrymen and Material Scientists Society | In English | → Organizations and associations → Metallurgy |
| GFP | Generalized Filter Program | In English | |
| GFP | Government-Furnished Property | In English | → Public administration, government |
| GFRP | Graphite-Fiber-Reinforced Plastic | In English | → Chemical technology |
| GFRP | Glass-Fiber-Reinforced Plastic | In English | → Chemical technology |
| GFS | Government-Furnished Software | In English | → Central administration → Software |
| GFSA | Global Forum on Sustainable Energy | In English | → Energy economics |
| GFTM | Generic Fluids Transfer Model | In English | → Mechanical engineering |
| GFY | Government Fiscal Year | In English | → Public administration, government |
| GG | Gravity Gradient | In English | → Physics |
| GG | Gas Generator | In English | |
| GG | Ground to Ground | In English | |
| GGA | Generalized Gradient Approximation | In English | |
| GGG | Geochemistry, Geophysics, Geosystems | In English | → Serial publications, periodicals → Geophysics → Geochemistry |
| GGSN | Gateway GPRS Support Node | In English | → Telecommunications |
| GGVM | Gas Generator Valve Module | In English | → Mechanical engineering |
| GHA | General History of Astronomy | In English | → Serial publications, periodicals → Astronomy → History |
| GHA | General Housekeeping Area | In English | → 64 |
| GHA | Greenwich Hour Angle | In English | |
| GHC | Ground Half-Coupling | In English | |
| GHE | Ground Handling Equipment | In English | |
| GHE | Gaseous Helium | In English | → Chemistry |
| GHI | German Historical Institute | In English | → Organizations and associations → History |
| GHRS | Goddard High Resolution Spectrograph | In English | → Physics → Analytical chemistry |
| GHX | Ground Heat Exchanger | In English | |
| GHZ | Gigahertz | In English | → Physics → Telecommunications |
| GI | Gastrointestinal | In English | → Medicine |
| GI | Geophysical Institute | In English | → Research institutes → Geophysics |
| GI | Glycemic Index = GI | Glykemický index | In Czech = GI | Glykæmisk indeks | In Danish = GI | Glykämischer Index | In German = GI | Glükeemiline indeks | In Estonian = GI | Glykeeminen indeksi | In Finnish = IG | Índice glicêmico | In Portuguese = ГИ | Гликемијски индекс | In Serbian = GI | Glisemik indeks | In Turkish |
In English | → Nutrition → Food technology |
| GI | Galvanized Iron | In English | → Metallurgy |
| GIA | General-Purpose Computer Interface Adapter | In English | → Human-computer interaction |
| GIA | General Investment Authority | In English | → 33972 |
| GIAG | Government-Industry Advisory Group | In English | → Public administration, government |
| GIANT | Gene therapy: an Integrated Approach for Neoplastic Treatment | In English | → Biotechnology → Medicine |
| GIBIS | Graphical Issue-Based Information System | In English | |
| GIC | GPC Interface Console | In English | → Human-computer interaction |
| GICAS | Grammatological Informatics based on Corpora of Asian Scripts | In English | → Linguistics |
| GIDC | Grenada Industrial Development Corporation | In English | → 33972 |
| GIDD | GSE Interface Definition Document | In English | |
| GIDEP | Government Interagency Data Exchange Program | In English | → Data → Public administration, government |
| GIDEP | Government-Industry Data Exchange Program | In English | → Data → Public administration, government |
| GIDS | General-Purpose Interactive Display System | In English | → Hardware → Electronics |
| GIE | Ground Instrumentation Equipment | In English | |
| GIF | Graphics Interchange Format | In English | → Data |
| GIF | Graphic Interchange Format | In English | → Graphical processing → Image processing" |
| GIFTS | Global Initiative to Fight Trafficking and Slavery | In English | → Organizations and associations → Slavery |
| GII | Global Information Infastructure | In English | |
| GILRS | Goethals Indian Library and Research Society | In English | → Libraries → Language, linguistics, literature |
| GIM | Generalized Information Management | In English | → Data → Knowledge management |
| GIMADS | Generic Integrated Maintenance Diagnostics | In English | → Maintenance and logistics → Engineering, technology |
| GIMADS | Generic Integrated Maintenance And Diagnostic System | In English | → Maintenance and logistics → Engineering, technology |
| GIN | Growth Initiative for Nanoelectronics | In English | → Electronics |
| GIOP | General Inter-ORB Protocol | In English | → Software |
| GIPC | Ghana Investment Promotion Centre | In English | → 33972 |
| GIPFZA | Gambia Investment Promotion and Free Zones Agency | In English | → 33972 |
| GIRD | Ground Integration Requirements Document | In English | → Applied sciences, technology |
| GIRLS | Generalized Information Retrieval Language System | In English | → Data → Operating systems |
| GIRM | General Instruction of the Roman Missal | In English | → Roman catholic church |
| GIRM | Geospatial Interoperability Reference Model | In English | → Geodesy, cartography |
| GIRs | General Institute Requirements | In English | → Education |
| GIS | Geographic(al) Information System = SIG | Sistema Informativo Geografico | In Italian = SIG | Sistema de Información Geográfica | In Spanish = SIG | Sistema d'informació geogràfica | In Catalan = GIS | Geografický Informační Systém | In Czech = ГИС | Географска информационна система | In Bulgarian = ΓΣΠ | Γεωγραφικά Συστήματα Πληροφοριών | In Greek = GIS | Geographisches Informationssystem | In German = GIS | Geoinformationssystem | In German = GIS | Geoinfosüsteem | In Estonian = GIS | Geografski informacijski sustav | In Croatian = ממ"ג | מערכת מידע גאוגרפית | In Hebrew = GIS | Geografinė informacinė sistema | In Lithuanian = SIG | Sistem Informasi Geografis | In Indonesian = GIS | Geografisch Informatiesysteem | In Dutch = GIS | Geografiske informasjonssystem | In Nynorsk = GIS | Geografiske informasjonssystemer | In Norwegian = SIG | Sistema de informação geográfica | In Portuguese = ГИС | Географическая Информационная Система | In Russian = GIS | Geografski informacijski sistem | In Slovenian = GIS | Geografiskt InformationsSystem | In Swedish = ГІС | Геоінформаційна система | In Ukrainian |
In English | → Software → Geography |
| GIS | Genome Institute of Singapore | In English | → Research institutes → Biotechnology |
| GIS | Green Investment Scheme | In English | |
| GISAID | Glabal Initiative on Sharing Avian Influenza Data | In English | → Zoology → Veterinary medicine |
| GISO | General Industry Safety Order | In English | |
| GISS | Goddard Institute for Space Studies | In English | → Astronomy |
| GITG | Ground Interface Technical Group | In English | |
| GIWG | Ground Iiterface Working Group | In English | |
| GJAPS | (The) Graduate Journal of Asia-Pacific Studies | In English | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| GKS | Graphical Kernel System | In English | → Operating systems |
| GKS | Graphics Kernel System | In English | → Software |
| GL | Guideline | In English | |
| GLA | Global Logistics Associates (www.glanetwork.com) | In English | → Maintenance and logistics → Transport and postal services |
| GLA | Gamma-Linolenic Acid | In English | → Biochemistry, biophysics |
| GLA | God's Littlest Angels | In English | → Social welfare |
| GLA | Greater London Authority (www.london.gov.uk) | In English | → Municipal administration |
| GLA | Gangmasters Licensing Authority (www.gla.gov.uk) | In English | → Labour, labour economics → Agricultural sciences |
| GLAADS | Gun Low-Altitude Air Defense System | In English | → Military engineering → Aeronautics, aircraft → 358 |
| GLAD | Goal: Language Arts Development | In English | → Arts |
| GLANCE | GlobAL Computer ScieNCE | In English | → Computer science |
| GLATC | Graphics and Languages Testing and Certification | In English | |
| GLC | Generator Line Contractor | In English | |
| GLCM | Ground-Launched Cruise Missile | In English | → Military engineering |
| GLIS | Geac Library Information System | In English | → Libraries |
| GLLD | Ground Locator Laser Designator | In English | |
| GlMaJ | Glasgow Mathematical Journal | In English | → Serial publications, periodicals → Mathematics |
| GLOCOM | (Center for) Global Communications | In English | |
| GLOMR | Global Low-Orbiting Message Relay | In English | → Spaceflight engineering, astronautics |
| GLORe | Goethe Link Observatory Reprints | In English | → Serial publications, periodicals → Astronomy |
| GLORIA | Global Observation Research Initiative in Alpine Environments | In English | → Earth sciences |
| GLORIA | Global Research in International Affairs | In English | → International relations |
| GLOW | Gross Lift-Off Weight | In English | |
| GLOW | Ground Lift-Off Weight | In English | |
| GLP | GOAL Language Processor | In English | → Software |
| GLRA | German Leprosy and Tuberculosis Relief Association | In English | → Associations → Pathology |
| GLS | Ground Launch Sequencer | In English | |
| GM | Gaseous Mixture | In English | |
| GM | Geometric Mean | In English | → Mathematics |
| GMAL | General Electric Macro Assembly Language | In English | → Electrical engineering |
| GMAT | General Management Aptitude Test | In English | → Management → Education |
| GMAW | Gas Metal Arc Welding | In English | → Metallurgy |
| GMCC | Ground Mobile Control Center | In English | |
| GMCL | Ground Measurements Command List | In English | |
| GME | Gimbal Module Electronics | In English | → Electronics |
| GMES | Global Monitoring for Environment and Security | In English | |
| GMES | Global Monitoring for Environmental and Security | In English | → Nature → Environment, environmental sciences |
| GMF | Ground Module Force | In English | |
| GMIP | Government Mandatory Inspection Point | In English | → Public administration, government |
| GMIP | Graphical Models and Image Processing | In English | → Serial publications, periodicals → Graphical processing → Image processing |
| GMIS | GSSC Management Information System | In English | → Data |
| GMIS | Ground STDN Management Information System | In English | → Data |
| GML | Geo-Marine Letters | In English | → Serial publications, periodicals → Marine research, oceanography → Hydrology |
| GML | General Measurement Loop | In English | |
| GML | Geography Markup Language | In English | → Programming languages → Geography |
| GMLCC | Ground Mobile Launch Control Center | In English | |
| GMM | Geometrical Math Model | In English | → Mathematics |
| GMM | Geometric Morphometrics | In English | → Anthropology |
| GMM | Gaussian Mixture Model | In English | → Statistics → Mathematics |
| GMMAFG | Global Multimedia Mobility Architecture Framework Group | In English | → Organizations and associations → Telecommunications |
| GMMCG | Global Multimedia Mobility Co-ordination Group | In English | → Organizations and associations → Telecommunications |
| GMP | Good Manufacturing Practice | In English | → Engineering, technology |
| GMS | Geostationary Meterological Satellite | In English | → Meteorology, climatology → Spaceflight engineering, astronautics |
| GMSC | Gateway Mobile Service Switching Center | In English | → Telecommunications |
| GMT | Greenwich Mean Time | In English | → Standardization |
| GN | Ground Network | In English | |
| GN&C | Guidance, Navigation, and Control | In English | → Vehicle engineering |
| GN&CS | Guidance, Navigation, and Control Subsystem | In English | → Vehicle engineering |
| GN-SAN | Gijodai-Nihongo-South Asian Net | In English | |
| GNC | Guidance and Navigation Computer | In English | → Hardware → Vehicle engineering |
| GNC | Guidance, Navigation, and Control | In English | → Vehicle engineering |
| GNCFTS | Guidance, Navigation, and Control Flight Test Station | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| GNCIS | Guidance, Navigation, and Control Integration Simulator | In English | → Vehicle engineering |