| GCIL | Ground Command Interface Logic | In English | → Human-computer interaction |
| GCLW | General Confederation for Lebanese Workers | In English | → Organizations and associations → Labour, labour economics |
| GCN | Ground Communications Network | In English | → Telecommunications → Networks, communication |
| GCN | Ground Control Network | In English | → Networks, communication |
| GCNew | Galactic Center Newsletter | In English | → Serial publications, periodicals → Astronomy |
| GCOS | Ground Computer Operating System | In English | → Operating systems |
| GCOS | General Computer Operational System | In English | → Computer science |
| GCRAI | Groupe Consultatif pour la Recherche Agronomique Internationale | In French | → Organizations and associations → Biological sciences → Agricultural sciences |
| GCSV | Groningse Christelijke Sport Vereniging | In Dutch | → Organizations and associations → Christianity → Sport, physical exercises |
| GDA | Gabriël del Adalorata | In Dutch | → Organizations and associations → Sport, physical exercises |
| GDA | Gesamtverband der Aluminiumindustrie | In German | → Organizations and associations → Metallurgy |
| GDBS | Generalized Data Base System | In English | → Data |
| GDC | Genderen Drongelen Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises |
| GDCh | Gesellschaft Deutscher Chemiker | In German | → Organizations and associations → Chemistry |
| GDDM | Graphical Data Display Manager | In English | → Human-computer interaction |
| GDEF | Grand Dictionnaire Estonien Français | In French | → Dictionaries → Linguistics |
| GDMS | Ground Data Management System | In English | → Data → Knowledge management |
| GDMS | Generic Data Management System | In English | → Data → Knowledge management |
| GDN | Gestion Numérique des Droits = DRM | Digital Rights Management | In English |
In French | → Document processing → Industrial property → Artistic property |
| GDO | Grande Distribuzione Organizzata | In Italian | → Organizations and associations → Transport and postal services |
| GDP | Generalized Documentation Processor | In English | → Knowledge management → Libraries |
| GDS | Geophysical Developments Series | In English | → Serial publications, periodicals → Geophysics |
| GDS | Groot Door Samenwerking | In Dutch | → Organizations and associations → Sport, physical exercises |
| GDSD | Ground Data Systems DIvision | In English | → Data |
| GDSM | Ground Data Systems Manager | In English | → Data |
| GDSO | Ground Data Systems Officer | In English | → Data |
| GDSS | Group Decision Support Systems | In English | → Management |
| GDZ | Göttinger Digitalisierungszentrum | In German | → Document processing → Libraries |
| GE | Gigabit Ethernet | In English | → Networks, communication |
| Ge&Ae | Geomagnetizm i Aeronomiia = Ge&Ae | Геомагнетизм и аэрономия | In Russian |
In Russian | → Serial publications, periodicals → Geophysics |
| Ge&Ae | Геомагнетизм и аэрономия = (look above) |
In Russian | → Serial publications, periodicals → Geophysics |
| GEA | Gestion des Entreprises et des Administrations | In French | → Management → Economics → Public administration, government |
| GEA | Germana Esperanto-Asocio (www.esperanto.de/gea/) | In Esperanto | → Associations |
| GEA | Groupe des Écoles Aéronautiques et spatiales | In French | → Organizations and associations → Specialized or (poly)technical colleges → Aeronautics, aircraft → 6297 |
| GeAer | Geodeziia i Aerofotos'emka | In Russian | → Serial publications, periodicals → Geodesy, cartography |
| GEAN | Georgia Environmental Action Network | In English | → Organizations and associations → Nature |
| GEB | Gemeentelijke Energie Boys | In Dutch | → Organizations and associations → Sport, physical exercises |
| GEB | Games and Economic Behavior | In English | → Serial publications, periodicals → Economics |
| GeCoA | Geochimica et Cosmochimica Acta | In Latin | → Serial publications, periodicals → Geochemistry → Astronomy |
| GECT | Groupement Européen de Coopération Transfrontalière = GEKT | Grupoj Eŭropaj je Koopero Teritoria | In Esperanto = PSI | Paul Scherrer Institut | In German |
In French | → Organizations and associations → International relations |
| GED | Gestion Électronique des Documents = EDM | Electronic Document Management | In English = GED | Gerenciamento Eletrônico de Documentos | In Portuguese = GED | Gestão Electrónica de Documentos | In Portuguese |
In French | → Document processing → Knowledge management → Libraries |
| GED | Gestão Electrónica de Documentos = EDM (look above) |
In Portuguese | → Document processing → Knowledge management → Libraries |
| GED | Gerenciamento Eletrônico de Documentos = EDM (look above) |
In Portuguese | → Document processing → Knowledge management → Libraries |
| GEDEM | Groupement des Éditeurs et Diffuseurs d’Éducatif Multimédia (www.gedem.org) | In French | → Organizations and associations → Computer science → Education → Cinema, movies |
| GeGe | Geophysica et Geodaetica | In Latin | → Serial publications, periodicals → Geodesy, cartography → Geophysics |
| GEIDE | Gestion Électronique de l'Information ou de Documents Existants | In French | → Document processing → Knowledge management |
| GEII | Génie Électrique et Informatique Industrielle | In French | → Computer science → Electrical engineering |
| GEIPI | Groupement d'Écoles d'Ingénieurs à Préparation Intégrée | In French | → Organizations and associations → Specialized or (poly)technical colleges → Engineering, technology |
| GEJ | Guanabara Esperanto Junularo | In Esperanto | → Organizations and associations |
| GEJ | Germana Esperanto-Junularo (www.esperanto.de/gej) | In Esperanto | → Organizations and associations |
| GeKaA | Geodeziia, Kartografiia i Aerofotos'emka | In Russian | → Serial publications, periodicals → Geodesy, cartography |
| GeKar | Геодезия и картография = GeKar | Geodeziia i Kartografiia | In Russian |
In Russian | → Serial publications, periodicals → Geodesy, cartography |
| GeKar | Geodeziia i Kartografiia = (look above) |
In Russian | → Serial publications, periodicals → Geodesy, cartography |
| GEKT | Grupoj Eŭropaj je Koopero Teritoria = GECT, PSI (look above) |
In Esperanto | → Organizations and associations → International relations |
| GEL | Germana Esperanto-Ligo | In Esperanto | → Organizations and associations |
| GELAHN | Groupe des Enseignants de Langues Anciennes de Normandie | In French | → Organizations and associations → Education → Linguistics |
| GELLMU | Generalized Extensible LaTeX-Like MarkUp | In English | → Programming languages → Data |
| GEMA | Groupement des Entreprises Mutuelles d'Assurances | In French | → Organizations and associations → Insurance |
| GEMPPM | Groupe d'Études de Métallurgie Physique et de Physique des Matériaux | In French | → Research institutes → Physics → Metallurgy |
| Gen | Genetica | In Latin | → Serial publications, periodicals → Genetics |
| GENI | Global Environnement for Network Innovations | In English | → Networks, communication |
| GEO | Garmerwolde En Omstreken | In Dutch | → Organizations and associations → Sport, physical exercises |
| GeocJ | Geochemical Journal | In English | → Serial publications, periodicals → Geochemistry |
| GeoD | Geometriae Dedicata | In Latin | → Serial publications, periodicals → Geometry |
| GeoIs | Geomagnitnye Issledovaniia | In Russian | → Serial publications, periodicals → Geophysics |
| GeoJ | Geophysical Journal | In English | → Serial publications, periodicals → Geophysics |
| GeoJI | Geophysical Journal International | In English | → Serial publications, periodicals → Geophysics |
| GeoK | Geodezja i Kartografia | In Polish | → Serial publications, periodicals → Geodesy, cartography |
| 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 |
| GeoNr | Geophysica Norvegica | In Latin | → Serial publications, periodicals → Geophysics |
| 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 |
| GeoSb | Geofizicheskii Sbornik | In Russian | → Serial publications, periodicals → Geophysics |
| GEOSC | GEOS Circular on Eclipsing Binaries | In English | → Serial publications, periodicals → Astronomy |
| 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 |
| GeoZh | Geofizicheskii Zhurnal = GeoZh | Геофизический журнал | In Russian |
In Russian | → Serial publications, periodicals → Geophysics |
| GeoZh | Геофизический журнал = (look above) |
In Russian | → Serial publications, periodicals → Geophysics |
| GEPRAF | Grupo de Esperanto-Parolantaj Radio-Amatoroj en Francio | In Esperanto | → Organizations and associations → Telecommunications |
| GERPAC | Groupe d'Évaluation et de Recherche sur la Protection en Atmosphère Contrôlée | In French | → Organizations and associations → Pharmacology, toxicology |
| GESAC | Groupement Européen des Sociétés d'Auteurs et Compositeurs (www.gesac.org) | In French | → Organizations and associations → Literature → Music → Artistic property |
| GESEAS | Global Eagle Strategic Empowerment Alliance Systems | In English | → Organizations and associations |
| GESTA | Galder En Strijbeek Ten Aanval | In Dutch | → Organizations and associations → Sport, physical exercises |
| GET | Groupe des Écoles de Télécommunications (www.get-telecom.fr) | In French | → Organizations and associations → Specialized or (poly)technical colleges → Telecommunications |
| GET | Groupe des Écoles des Télécommunications | In French | → Organizations and associations → Specialized or (poly)technical colleges → Telecommunications |
| GFC | Groupe Français de la Céramique | In French | → Organizations and associations → 666 |
| GFC | Grubbenvorster Football Club | In Dutch | → Organizations and associations → Football and rugby |
| GFC | Goorsche Football Club | In Dutch | → Organizations and associations → Football and rugby |
| GFC | Gigabit Fiber Channel | In English | → Networks, communication |
| GFD | Government-Furnished Data | In English | → Data → Public administration, government |
| GFEV | Groupe Français d'Étude des Vascularites | In French | → Organizations and associations → Blood and circulatory system → Pathology |
| GFF | Gesellschaft zur Förderung der Forschung | In German | → Research policy |
| GFI | Groupe des Fédérations Industrielles (www.industrie-gfifrance.com) | In French | → Organizations and associations → Industry, industrial policy |
| GFII | Groupement Français de l'Industrie de l'Information | In French | → Organizations and associations → Libraries |
| GFMS | Georgian Foundrymen and Material Scientists Society | In English | → Organizations and associations → Metallurgy |
| GFS | Government-Furnished Software | In English | → Central administration → Software |
| GfW | Gesellschaft für Weltraumforschung | In German | → Organizations and associations → Astronomy → Spaceflight engineering, astronautics |
| GGA | Göttingische gelehrte Anzeigen | In German | → Serial publications, periodicals |
| GGC | Groupe Génétique et Cancer | In French | → Research institutes → Genetics → Oncology |
| GGFP | Gesellschaft für Gemeindepsychologische Forschung und Praxis | In German | → Organizations and associations → Psychology |
| GGG | Geochemistry, Geophysics, Geosystems | In English | → Serial publications, periodicals → Geophysics → Geochemistry |
| GGK | Gemeentelijk Gasbedrijf Keileweg | In Dutch | → Organizations and associations → Sport, physical exercises |
| GHA | General History of Astronomy | In English | → Serial publications, periodicals → Astronomy → History |
| GHC | Groene Hart Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises |
| GHI | German Historical Institute | In English | → Organizations and associations → History |
| GI | Geophysical Institute | In English | → Research institutes → Geophysics |
| GI | Gesellschaft für Informatik (www.gi-ev.de) | In German | → Organizations and associations → Computer science |
| GIA | General-Purpose Computer Interface Adapter | In English | → Human-computer interaction |
| GIC | GPC Interface Console | In English | → Human-computer interaction |
| GIDE | Gestion de l'Information et de la Documentation en Entreprise | In French | → Document processing → Knowledge management → Libraries |
| 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 | Groupement d'Intérêt Économique | In French | → Organizations and associations → Economics |
| GIE-SIPS | Groupement d'Intérêt Économique - Système d'Infomation sur les Produits de Santé | In French | → Organizations and associations → Pharmacology, toxicology |
| GIF | Graphic Interchange Format | In English | → Graphical processing → Image processing" |
| GIF | Graphics Interchange Format | In English | → Data |
| GIFAM | Groupement Interprofessionnel des Fabricants d'Appareils d'Équipement Ménager | In French | → Organizations and associations → Engineering, technology |
| GIFTS | Global Initiative to Fight Trafficking and Slavery | In English | → Organizations and associations → Slavery |
| GiGi | Gidroprivod i Gidropnevmoavtomatika | In Russian | → Serial publications, periodicals → Engineering, technology |
| GILRS | Goethals Indian Library and Research Society | In English | → Libraries → Language, linguistics, literature |
| GIM | Generalized Information Management | In English | → Data → Knowledge management |
| GIM | Génie Industriel et Maintenance | In French | → Maintenance and logistics → Engineering, technology |
| 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 |
| GIMELEC | Groupement des Industries de Matériels d’Équipement Électrique et de l’Électronique industrielle associée | In French | → Organizations and associations → Electrical engineering → Electronics |
| GIOP | General Inter-ORB Protocol | In English | → Software |
| GIP | Groupement d'Intérêt Public | In French | → Organizations and associations → Politics |
| GIP-SIM | Groupement Interprofessionnel de Promotion des Systèmes d'Information Médico-sociale | In French | → Organizations and associations |
| GIRCEP | Groupement des Industries et Centres de Recherche en Électronique de Puissance | In French | → Organizations and associations → Electrical engineering |
| GIRLS | Generalized Information Retrieval Language System | In English | → Data → Operating systems |
| GIRM | Gesellschaft für integriertes Risikomanagement | In German | → Organizations and associations → Management |
| GIRM | Gruppo Interdivisionale Risonanze Magnetiche | In Italian | → Organizations and associations → Chemistry |
| GIRPR | Gruppo Italiano Ricercatori in Pattern Recognition | In Italian | → Organizations and associations → Computer-based techniques |
| GIS | Geografiske informasjonssystem = GIS | Geographic(al) Information System | In English = 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 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 Nynorsk | → Software → Geography |
| GIS | Geoinformationssystem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In German | → Software → Geography |
| GIS | Geografický Informační Systém = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Czech | → Software → Geography |
| GIS | Geographisches Informationssystem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In German | → Software → Geography |
| GIS | Geoinfosüsteem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Estonian | → Software → Geography |
| GIS | Geografiske informasjonssystemer = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Norwegian | → Software → Geography |
| GIS | Geografski informacijski sustav = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Croatian | → Software → Geography |
| GIS | Geografinė informacinė sistema = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Lithuanian | → Software → Geography |
| GIS | Geografisch Informatiesysteem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Dutch | → Software → Geography |
| GIS | Geografski informacijski sistem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Slovenian | → Software → Geography |
| GIS | Geografiskt InformationsSystem = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In Swedish | → Software → Geography |
| GIS | Groupement d'Intérêt Scientifique | In French | → Organizations and associations → Mathematics and natural sciences |
| GIS | Genome Institute of Singapore | In English | → Research institutes → Biotechnology |
| GIS | Geographic(al) Information System = SIG, ГИС, ΓΣΠ, ממ"ג, ГІС (look above) |
In English | → Software → Geography |
| 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 | Groupement des Industries de Télécommunications et d'Électronique Professionnelle | In French | → Organizations and associations → Electronics → Telecommunications |
| GITEP | Grupo de Intercambio Tecnológico de Explotaciones Porcinas | In Spanish | → Organizations and associations → Agricultural sciences |
| 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 |
| GJAPS | (The) Graduate Journal of Asia-Pacific Studies | In English | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| GJF | Gesellschaft für Japanforschung | In German | → Organizations and associations → Area studies |
| GJS | Gorkumse Jonge Spartaan | In Dutch | → Organizations and associations → Sport, physical exercises |
| GKC | Gasselte Kostvlies Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises |
| GKE | Gobernuz Kanpoko Erakunde = ONGs | Organizações Não Governamentais | In Portuguese = NGO | Non-Governmental Organization | In English = NGO | Nichtregierungsorganisation | In German = ANG | Aozadur Nann-Gouarnamantel | In Breton = ONG | Organisation Non Gouvernementale | In French = NRO | Ne-Registara Organizo | In Esperanto = ONG | Organizzazione non governativa | In Italian = LSM | Lembaga Swadaya Masyarakat | In Indonesian = ONG | Organización non gobernamental | In Galician = ONG | Organización no gubernamental | In Spanish = ΜΚΟ | Μη κυβερνητικές οργανώσεις | In Greek = NNO | Nevládní nezisková organizace | In Czech = ONG | Organització no governamental | In Catalan = ННО | Неурядові неприбуткові організації | In Ukrainian = ONG | Organização não governamental | In Portuguese = NGO | Niet-gouvernementele organisatie | In Dutch = NVO | Nevyriausybinė organizacija | In Lithuanian |
In Basque | → Organizations and associations |
| GKS | Graphical Kernel System | In English | → Operating systems |
| GKS | Graphics Kernel System | In English | → Software |
| GLA | Global Logistics Associates (www.glanetwork.com) | In English | → Maintenance and logistics → Transport and postal services |
| GLANCE | GlobAL Computer ScieNCE | In English | → Computer science |
| GLFA | Groupement des Lamineurs et Fileurs d'Aluminium | In French | → Organizations and associations → Metallurgy |
| GLIS | Geac Library Information System | In English | → Libraries |
| GlMaJ | Glasgow Mathematical Journal | In English | → Serial publications, periodicals → Mathematics |
| GLORe | Goethe Link Observatory Reprints | In English | → Serial publications, periodicals → Astronomy |
| GLP | GOAL Language Processor | In English | → Software |
| 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 |
| GLZ | Geestdrift Leert Zegevieren | In Dutch | → Organizations and associations → Sport, physical exercises |
| GM | Giornale di Metafisica | In Italian | → Serial publications, periodicals → Metaphysics |
| GMA | Gruppo Missioni Asmara | In Italian | → Organizations and associations |
| GMAO | Gestion de la Maintenance Assistée par Ordinateur | In French | → Maintenance and logistics → Computer-based techniques |
| GMAT | General Management Aptitude Test | In English | → Management → Education |
| GMI | Groupement des Métiers de l’Imprimerie | In French | → Organizations and associations → Graphic industries, printing, publishing |
| 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 | Geography Markup Language | In English | → Programming languages → Geography |
| GMM | Gruppo Missionario Merano | In Italian | → Organizations and associations |
| 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 |
| GMT | Greenwich Mean Time | In English | → Standardization |
| GMuD | Gesellschaft Mathematik und Datenverarbeitung | In German | → Computer science → Serial publications, periodicals → Mathematics |
| GMULL | Groupe Mareuillais d'Utilisateurs de Logiciels Libres | In French | → Software |
| GNC | Guidance and Navigation Computer | In English | → Hardware → Vehicle engineering |
| GNCR | Groupement National des Cinémas de Recherche (www.cinemas-de-recherche.com) | In French | → Organizations and associations → Cinema, movies |
| GNOME | GNU Network Object Model Environment | In English | → Software |
| 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 |
| GNU | GNU's Not Unix | In English | → Software |