| GfW | Gesellschaft für Weltraumforschung | In German | → Organizations and associations → Astronomy → Spaceflight engineering, astronautics |
| GGC | Groupe Génétique et Cancer | In French | → Research institutes → Genetics → Oncology |
| GGF | La Gérance Générale Foncière | In French | → Accommodation → Electrical engineering |
| GGSN | Gateway GPRS Support Node | In English | → Telecommunications |
| GGVM | Gas Generator Valve Module | In English | → Mechanical engineering |
| GHA | General Housekeeping Area | In English | → 64 |
| GHM | Groupe Hersant Médias | In French | → Telecommunications → Graphic industries, printing, publishing |
| GHZ | Gigahertz | In English | → Physics → Telecommunications |
| 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 |
| GI | Gastrointestinal | In English | → Medicine |
| GI | Glykemický index = IG, ГИ (look above) |
In Czech | → Nutrition → Food technology |
| GI | Glykæmisk indeks = IG, ГИ (look above) |
In Danish | → Nutrition → Food technology |
| GI | Glykämischer Index = IG, ГИ (look above) |
In German | → Nutrition → Food technology |
| GI | Glükeemiline indeks = IG, ГИ (look above) |
In Estonian | → Nutrition → Food technology |
| GI | Glisemik indeks = IG, ГИ (look above) |
In Turkish | → Nutrition → Food technology |
| GI | Glykeeminen indeksi = IG, ГИ (look above) |
In Finnish | → Nutrition → Food technology |
| GIANT | Gene therapy: an Integrated Approach for Neoplastic Treatment | In English | → Biotechnology → Medicine |
| GIB | Giza Immunoeskasiaren Birusa = VIH | Virus de l'Immunodéficience Humaine | In French = HIV | Human Immunodeficiency Virus | In English = VIH | Virus d'Inmunodeficencia Humana | In Asturian = VIH | Vírus da imunodeficiência humana | In Portuguese = VIDH | Virus Immunitarii Defectus Humanae | In Latin = ŽIV | Žmogaus Imunodeficito Virusas | In Lithuanian = ХИВ | Хумане имунодефицијенције | In Serbian = MIV | Menslike Immuniteitsgebreksvirus | In Afrikaans = HIV | Humani Imunodeficientni Virus | In Slovenian = ВИЧ | Вирус иммунодефицита человека | In Russian |
In Basque | → Virology → Immunology and allergy → Infectious diseases |
| GIDS | General-Purpose Interactive Display System | In English | → Hardware → Electronics |
| GIE-SIPS | Groupement d'Intérêt Économique - Système d'Infomation sur les Produits de Santé | In French | → Organizations and associations → Pharmacology, toxicology |
| GIFAM | Groupement Interprofessionnel des Fabricants d'Appareils d'Équipement Ménager | In French | → Organizations and associations → Engineering, technology |
| GiGi | Gidroprivod i Gidropnevmoavtomatika | In Russian | → Serial publications, periodicals → Engineering, technology |
| GIM | Génie Industriel et Maintenance | In French | → Maintenance and logistics → Engineering, technology |
| GIMADS | Generic Integrated Maintenance And Diagnostic System | In English | → Maintenance and logistics → Engineering, technology |
| GIMADS | Generic Integrated Maintenance Diagnostics | In English | → Maintenance and logistics → Engineering, technology |
| GIMELEC | Groupement des Industries de Matériels d’Équipement Électrique et de l’Électronique industrielle associée | In French | → Organizations and associations → Electrical engineering → Electronics |
| GIMR | Groupe Ingénierie et Maintenance Réseaux | In French | → Electrical engineering |
| GIN | Growth Initiative for Nanoelectronics | In English | → Electronics |
| GIRCEP | Groupement des Industries et Centres de Recherche en Électronique de Puissance | In French | → Organizations and associations → Electrical engineering |
| GIRD | Ground Integration Requirements Document | In English | |
| GIS | Genome Institute of Singapore | In English | → Research institutes → Biotechnology |
| GISAID | Glabal Initiative on Sharing Avian Influenza Data | In English | → Zoology → Veterinary medicine |
| GiSan | Гигиена и санитария = GiSan | Gigiena i Sanitariia | In Russian |
In Russian | → Serial publications, periodicals → Personal health and hygiene |
| GiSan | Gigiena i Sanitariia = (look above) |
In Russian | → Serial publications, periodicals → Personal health and hygiene |
| GITEP | Grupo de Intercambio Tecnológico de Explotaciones Porcinas | In Spanish | → Organizations and associations → Agricultural sciences |
| GITEP | Groupement des Industries de Télécommunications et d'Électronique Professionnelle | In French | → Organizations and associations → Electronics → Telecommunications |
| GITEP TICS | Groupement des Industries des Technologies de l'Information et de la Communication | In French | → Organizations and associations → Computer science → Telecommunications" |
| GITT | Groupement des Industries du Transport et du Tourisme | In French | → Organizations and associations → Tourism → Transport and postal services |
| GIVE | Groupe Interministériel sur le Véhicule Électrique | In French | → Central administration → Vehicle engineering |
| GLA | Global Logistics Associates (www.glanetwork.com) | In English | → Maintenance and logistics → Transport and postal services |
| 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 |
| GLCM | Ground-Launched Cruise Missile | In English | → Military engineering |
| GLFA | Groupement des Lamineurs et Fileurs d'Aluminium | In French | → Organizations and associations → Metallurgy |
| GLNR | Gaz Liivré Non Relevé | In French | → Energy economics |
| GLOMR | Global Low-Orbiting Message Relay | In English | → Spaceflight engineering, astronautics |
| GLRA | German Leprosy and Tuberculosis Relief Association | In English | → Associations → Pathology |
| GLT | Gestion Logistique et Transport | In French | → Maintenance and logistics → Transport and postal services |
| GMAL | General Electric Macro Assembly Language | In English | → Electrical engineering |
| GMAW | Gas Metal Arc Welding | In English | → Metallurgy |
| GME | Gimbal Module Electronics | In English | → Electronics |
| GMI | Groupement des Métiers de l’Imprimerie | In French | → Organizations and associations → Graphic industries, printing, publishing |
| 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 |
| GMP | Génie Mécanique et Productique | In French | → Mechanical engineering |
| GMS | Geostationary Meterological Satellite | In English | → Meteorology, climatology → Spaceflight engineering, astronautics |
| GMSC | Gateway Mobile Service Switching Center | In English | → Telecommunications |
| GN | Glomérulonéphrite | In French | → Pathology |
| GN&C | Guidance, Navigation, and Control | In English | → Vehicle engineering |
| GN&CS | Guidance, Navigation, and Control Subsystem | In English | → Vehicle engineering |
| GNA | Glomérulonéphrite aiguë | In French | → Pathology |
| GNC | Glomérulonéphrite chronique | In French | → Pathology |
| 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 |
| GNCSIM | Guidance, Navigation, and Control Simulation | In English | → Vehicle engineering |
| GNCTS | Guidance, Navigation, and Control Test Station | In English | → Vehicle engineering |
| GNDF | Glial cell-line-Derived Neurotrophic Factor | In English | → Biochemistry, biophysics → Neurology |
| GNE | Guidance and Navigational Electronics | In English | → Electronics → Vehicle engineering |
| GNL | Gaz Naturel Liquefié | In French | → Energy economics → Chemical technology |
| GNPI | Gesellschaft für Neonatologie und Pädiatrische Intensivmedizin | In English | → Organizations and associations → Obstetrics → Pediatry |
| GNPÖ | Gesellschaft für Neuropsychologie Österreich | In German | → Organizations and associations → Psychology → Neurology |
| GNRP | Glomérulonéphrite rapidement progressive | In French | → Pathology |
| GNS | Guidance Navigation System | In English | → Vehicle engineering |
| GNS | Guidance and Navigation Simulator | In English | → Vehicle engineering |
| GNV | Gaz Naturel pour les Véhicules | In French | → Vehicle engineering |
| GNV | Gaz Naturel Véhicule | In French | → Energy economics → Vehicle engineering |
| GOAL | Ground Operations Aerospace Language | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| GÖCH | Gesellschaft Österreichischer Chemiker | In German | → Organizations and associations → Chemistry → Chemical technology |
| GOCNAE | Grupo de Organização da Comissão Nacional de Atividades Espaciais | In Portuguese | → Astronomy → Spaceflight engineering, astronautics |
| GOES | Geosynchronous Operational Environmental Satellite | In English | → Earth sciences → Spaceflight engineering, astronautics |
| GOES | Geostationary Operational Environment Satellite | In English | → Earth sciences → Spaceflight engineering, astronautics |
| GOES | Geostationary Operational Environmental Satellite | In English | → Environment, environmental sciences → Spaceflight engineering, astronautics |
| GOLD | Genomics of Lipid-associated Disorders | In English | → Genetics → Pathology |
| GOLD | Global initiative for Chronic Obstructive Lung Disease | In English | → Chest diseases |
| GONLO | Groupe d'Optique Non-Linéaire et d'Optoélectronique | In French | → Optics → Electronics |
| GPA | General-Purpose Amplifier | In English | → Engineering, technology |
| GPAO | Gestion de Production Assistée par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| GPAS | General-Purpose Airborne Simulator | In English | → Aeronautics, aircraft |
| GPB | General Physiology and Biophysics | In English | → Serial publications, periodicals → Biochemistry, biophysics → Physiology |
| GPL | GOAL Processing Language | In English | → Programming languages → Spaceflight engineering, astronautics |
| GPL | Gaz de Pétrole Liquéfié | In French | → Vehicle engineering → 665 |
| GPL | Gaz Pétrole Liquéfié | In French | → Energy economics → Chemical technology |
| GPNDS | Global Positioning and Nuclear Detection System | In English | → Geodesy, cartography → Nuclear technology |
| GPO | Government Printing Office | In English | → Public administration, government → Graphic industries, printing, publishing |
| GPON | Gigabit Passive Optical Network | In English | → Telecommunications |
| GPR | Ground Penetrating Radar | In English | → Telecommunications |
| GPR | Groupe Permanent chargé des Réacteurs nucléaires | In French | → Organizations and associations → Nuclear technology |
| GPRN | GOAL Test Procedure Release Notice | In English | → Programming languages → Spaceflight engineering, astronautics |
| GPRS | General Packet Radio Service | In English | → Telecommunications |
| GPS | Ground Power Supply | In English | → Electrical engineering |
| GPS | Global Positioning System | In English | → Geodesy, cartography → Spaceflight engineering, astronautics → Telecommunications |
| GPSCP | GPS (Global Positioning System) Computer Program | In English | → Software → Geodesy, cartography → Spaceflight engineering, astronautics |
| GPSPC | Government Postage Stamp Printer's Conference | In English | → Organizations and associations → Graphic industries, printing, publishing → Transport and postal services |
| GPU | Ground Power Unit | In English | → Electrical engineering |
| GPUR | GOAL Test Procedure Update Request | In English | → Programming languages → Spaceflight engineering, astronautics |
| GQA | Groupe des Questions Atomiques | In French | → Organizations and associations → Nuclear, atomic, and molecular physics → Nuclear technology |
| GrAeH | Grumman Aerospace Horizons | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| GRE | Gamma Ray Explorer | In English | → Astronomy → Spaceflight engineering, astronautics |
| GRECC | Geriatric Research, Education and Clinical Center | In English | → Gerontology |
| GRESICO | Groupe d'Étude en Santé, Travail, Information et Comportements | In French | → Sociology → Labour, labour economics → Medicine |
| GRETh | Groupement pour la Recherche sur les Échangeurs Thermiques | In French | |
| GRETIA | Génie des Réseaux de Transport et Informatique Avancée | In French | → Computer science → Transport and postal services |
| GRMC | Groupement de Radiodiffusion Monégasque | In French | → Telecommunications |
| GRMH | Glasgow Royal Maternity Hospital | In English | → Obstetrics |
| GRPS | General Packet Radio Service | In English | → Telecommunications |
| GRRT | Groupement Régional Nord Pas-de-Calais pour la Recherche dans les Transports | In French | → Organizations and associations → Transport and postal services |
| GSA | Gerontological Society of America | In English | → Organizations and associations → Gerontology |
| GSAT | Geosynchronous Satellite | In English | → Spaceflight engineering, astronautics |
| GSE | Ground Support Equipment | In English | → Engineering, technology |
| GSE | Ground Servicing Equipment | In English | → Engineering, technology |
| GSE | Government Support Equipment | In English | → Public administration, government → Engineering, technology |
| GSE | Goveđa spongiformna encefalopatija = BSE | Bovine Spongiform Encephalopathy | In English = ESB | Encéphalopathie Spongioforme Bovine | In French = BSE | Bova Spongoforma Encefalopatio | In Esperanto = EEB | Encefalopatía Espongiforme Bovina | In Portuguese = BSE | Bovine Spongiforme Enzephalopathie | In German = BSE | Bovin spongiform ensefalopati | In Turkish = ESB | Encephalopathia Spongiforme Bovin | In Interlingua = BSE | Boviene spongiforme encefalopathie | In Dutch = ESB | Encefalopatia Spongiforme Bovina | In Italian |
In Serbo-Croatian | → Veterinary medicine |
| GSE&I | General Systems Engineering and Integration | In English | → Engineering, technology |
| GSFC | Goddard Space Flight Center | In English | → Spaceflight engineering, astronautics |
| GSFC | (NASA) Godddard Space Flight Center | In English | → Spaceflight engineering, astronautics |
| GSK | GlaxoSmithKline (www.gsk.com) | In English | → Pharmacology, toxicology |
| GSO | Glandular sensory organ(s) | In English | → Biological sciences → Anatomy |
| GSO | Gaz du Sud-Ouest | In French | → Energy economics |
| GSS | Geosynchronous Space Station | In English | → Spaceflight engineering, astronautics |
| GSS | (Syndrome de) Gertsman-Straüssler-Scheinker | In French | → Pathology |
| GSSMT | German Society for Sexual Medicine and Sexual Therapy | In German | → Organizations and associations → Urology → Gynaecology → Psychology |
| GST | Gesellschaft Schweizerischer Tierärztinnen und Tierärzte = SVS | Société des Vétérinaires Suisses | In French |
In German | → Organizations and associations → Veterinary medicine |
| GSTAR | Saudi Arabian Communications Satellite | In English | → Spaceflight engineering, astronautics → Telecommunications |
| GSTDN | Ground Space Flight Tracking and Data Network | In English | → Astronomy → Spaceflight engineering, astronautics |
| GSTDN | Ground Spacecraft Tracking and Data Network | In English | → Data → Astronomy → Spaceflight engineering, astronautics |
| GSV | Gesellschaft für Straßen- und Verkehrswesen | In German | → Organizations and associations → Civil engineering → Transport and postal services |
| GSVOO | Ground Station Visibility of Orbiting Objects | In English | → Spaceflight engineering, astronautics |
| GTC | Genzyme Transgenics Corporation | In English | → Biochemistry, biophysics → Biotechnology |
| GTCL | Goodyear Technical Center Luxembourg | In English | → Plastic industry |
| GTD | Genomic Threading Database | In English | → Genetics → Biochemistry, biophysics → Biotechnology |
| GTE | Génie Thermique et Énergie | In French | → Thermodynamics → Energy economics |
| GTE | General Telephone and Electronics | In English | → Electronics → Telecommunications |
| GTEPE | Grupo de Trabalho de Estudos e Projetos Espaciais | In Portuguese | → Astronomy → Spaceflight engineering, astronautics |
| GTF | Groupement des Transporteurs Français | In French | → Organizations and associations → Transport and postal services |
| GTFF | Group of Terrestrial Freight Forwarders | In English | → Organizations and associations → Transport and postal services |
| GTLV | Government-Furnished Target Launch Vehicle | In English | → Public administration, government → Vehicle engineering |
| GTM | Ground Test Motor | In English | → Mechanical engineering |
| GTM | Ground Test Missile | In English | → Military engineering |
| GTO | Generic Technical Order | In English | → Engineering, technology |
| GTO | Geosynchronous Transfer Orbit | In English | → Spaceflight engineering, astronautics |
| GTPZ | Gigiena Truda i Professional'nye Zabolevaniia = GTPZ | Гигиена труда и профессиональные заболевания | In Russian |
In Russian | → Serial publications, periodicals → Biological sciences → Medicine |
| GTPZ | Гигиена труда и профессиональные заболевания = (look above) |
In Russian | → Serial publications, periodicals → Biological sciences → Medicine |
| GTR | Groupe des Transporteurs Routiers | In French | → Organizations and associations → Transport and postal services |
| GTR | Génie des Télécommunications et des Réseaux | In French | → Networks, communication → Telecommunications |
| GTS | GSM (Global System for Mobile Communications) Technical Specification | In English | → Telecommunications |
| GTS | Guidance Test Station | In English | → Vehicle engineering |
| GTV | Ground Test Vehicle | In English | → Vehicle engineering |
| GTV | Ground Transport Vehicle | In English | → Vehicle engineering |
| GTZ | Deutsche Gesellschaft für Technische Zusammenarbeit | In German | → Organizations and associations |
| GULiDef | Groupe des Utilisateurs de Linux dans la Défense | In French | → Organizations and associations → Operating systems → Military engineering |
| GVMK | Gibridnye Vychislitel'nye Mashiny i Kompleksy | In Russian | → Serial publications, periodicals → Mechanical engineering |
| GVP | Gentechnisch veränderte Pflanzen | In German | → Biotechnology → Agricultural sciences |
| GVS | Gießerei-Verband der Schweiz | In German | → Metallurgy |
| GVS | Gazversorgung Süddeutschland (www.gvs-erdgas.de) | In German | → Energy economics |
| GVSC | Generic VHSIC Spacecraft Computer | In English | → Hardware → Spaceflight engineering, astronautics |
| GX | Galaxy Express | In English | → Spaceflight engineering, astronautics |
| H5N1 | Hämagglutinin 5 Neuraminidase 1 | In German | → Pathology → Enzymes |
| HAADS | High-Altitude Attitude Determination System | In English | → Spaceflight engineering, astronautics |
| HAARS | High-Altitude Attitude Reference System | In English | → Spaceflight engineering, astronautics |
| HAART | Highly Active Antiretroviral Therapy | In English | → Pharmacology, toxicology → Infectious diseases |
| HAAS | High Altitude Aircrafts and Airships | In English | → Aeronautics, aircraft |
| HABP | Hypersonic Arbitrary Body Program | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HAC | Hughes Aircraft Company | In English | → Aeronautics, aircraft |
| HAFB | Hill Air Force Base | In English | → 358 → Aeronautics, aircraft |
| HAFB | Holloman Air Force Base | In English | → 358 → Aeronautics, aircraft |
| HAINS | High-Accuracy Inertial Navigation System | In English | → Vehicle engineering |
| HALS | High-order Assembly Language for Shuttle | In English | → Spaceflight engineering, astronautics |
| HALTE | Hologram Authentication Labels Technologies | In English | → Optics → Telecommunications |
| HANE | High-Altitude Nuclear Explosion | In English | → Nuclear technology → Military engineering |
| HAR | Hyperacute rejection | In English | → Immunology and allergy → Surgery, orthopaedics, ophthalmology |
| HAS | Hipertensão Arterial Sistêmica | In Portuguese | → Physiology → Pathology |
| HBT | Heflex Bioengineering Test | In English | → Biotechnology |
| HCFC | Hydrochlorofluorocarbone | In French | → Chemistry → Chemical technology |
| HCHy | Hovering Craft and Hydrofoil | In English | → Serial publications, periodicals → Vehicle engineering |
| HCM | Hémoglobine Corpusculaire Moyenne = MCH | Mean Corpuscular Haemoglobin | In English |
In French | → Blood and circulatory system |
| HCM | Highway Capacity Manual | In English | → Transport and postal services |
| HCP | Hydraulic Circulation Pump | In English | → Mechanical engineering |
| HCS | High-Carbon Steel | In English | → Metallurgy |
| HCSHT | High-Carbon Steel Heat-Treated | In English | → Metallurgy |
| HCSP | Health Care Savings Plan | In English | → Public health and hygiene |
| HCSP | Haut Comité de la Santé Publique | In French | → Public health and hygiene |
| HCST | Haut Conseil de la Science et de la Technologie | In French | → Mathematics and natural sciences → Engineering, technology |
| HCT | Hot Cell Technology | In English | → Nuclear, atomic, and molecular physics → 54458 → Nuclear technology |
| HCU | Hydraulic Charging Unit | In English | → Mechanical engineering |
| HCV | Helium Check Valve | In English | → Mechanical engineering |
| HD | Hungtington's Disease | In English | → Neurology |