| 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 |
| GNI | Grenoble Network Initiative | In English | → Regional planning |
| GNIEPA | Georgian National Investment and Export Promotion Agency | In English | → 33972 |
| GNOME | GNU Network Object Model Environment | In English | → Software |
| GNP | Gross National Product | In English | → Economics |
| GNPI | Gesellschaft für Neonatologie und Pädiatrische Intensivmedizin | In English | → Organizations and associations → Obstetrics → Pediatry |
| GNS | Guidance Navigation System | In English | → Vehicle engineering |
| GNS | Guidance and Navigation Simulator | In English | → Vehicle engineering |
| GNU | GNU's Not Unix | In English | → Software |
| GO | General Order | In English | |
| GO | Gene Ontology | In English | → Biological sciences |
| GO-NE | Government Office for the North East | In English | → Public administration, government |
| GO-SW | Government Office for the South West | In English | → Public administration, government |
| GOAL | Ground Operations Aerospace Language | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| GOASEX | Gulf Of Alaska Seasat Experiment | In English | |
| GOC | Ground Operations Coordinator | In English | |
| GOCA | Ground Operations Control Area | In English | |
| GOCO | Government-Owned, Contractor-Operated | In English | |
| GOE | Ground Outfitting Equipment | In English | |
| GOE | Ground Operating Equipment | In English | |
| GOE | Great Oxidation Event | In English | |
| 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 | General Ontology for Linguistic Description | In English | → Programming languages → Linguistics |
| GOLD | Global initiative for Chronic Obstructive Lung Disease | In English | → Chest diseases |
| GOMMS | Ground Operations and Material Management System | In English | |
| GOMOS | Global Ozone Monitoring by Occultation of Stars | In English | |
| GOMR | Global Ozone Monitoring Radiometer | In English | |
| GOMS | Ground Operations Management System | In English | |
| GOP | Ground Operations Panel | In English | |
| GOP | Ground Operations Plan | In English | |
| GOPG | Ground Operations Planning Group | In English | |
| GOR | Ground Operations Review | In English | |
| GORD | Ground Operations Requirements Document | In English | |
| GORP | Ground Operations Review Panel | In English | |
| GORP | Ground Operations Requirements Plan | In English | |
| GORR | Ground Operation(s) Readiness Review | In English | |
| GORS | Ground Observer RF System | In English | |
| GOS | Ground Operations System | In English | |
| GOSAMR | Gelation of Soils - Applied Microgravity Research | In English | → Earth sciences |
| GOSCON | Government Open Source Conference | In English | → Congresses → Software |
| GOSIP | Government Open Systems Interconnection Profile | In English | → Computer science |
| GOSP | Ground Operational Support Plan | In English | |
| GOSRP | Ground Operational Support Requirements Plan | In English | |
| GOSS | Ground Operational Support System | In English | |
| GOTS | Government Off The Shelf | In English | |
| GOWG | Ground Operations Working Group | In English | |
| GP | General-Purpose | In English | |
| GP | Government Property | In English | → Public administration, government |
| GPA | General-Purpose Amplifier | In English | → Engineering, technology |
| GPAS | General-Purpose Airborne Simulator | In English | → Aeronautics, aircraft |
| GPB | General Physiology and Biophysics | In English | → Serial publications, periodicals → Biochemistry, biophysics → Physiology |
| GPBIM | General-Purpose Buffer Interface Module | In English | |
| GPC | Gel Permeation Chromatograph(y) | In English | |
| GPC | Gyro Pulse Count | In English | |
| GPC | General-Purpose Computer | In English | → Hardware |
| GPC | Global and Planetary Change | In English | → Serial publications, periodicals → Earth sciences |
| GPC | General Purpose Computer | In English | |
| GPCB | GOAL Program Control Block | In English | |
| GPCIPL | General-Purpose Computer Initial Program Load | In English | → Computer science |
| GPD | Gimbal Position Display | In English | |
| GPGPU | General-Purpose Computing on Graphics Processing Units | In English | → Computer science |
| GPI | Ground Position Indicator | In English | |
| GPI | Gimbal Position Indicator | In English | |
| GPI | Glycophosphatidyinositol | In English | → Biochemistry, biophysics |
| GPIO | General-Purpose Input and Output | In English | → Data |
| GPIW | Global Peace Initiative of Women | In English | |
| GPL | GOAL Processing Language | In English | → Programming languages → Spaceflight engineering, astronautics |
| GPL | General-Purpose Laboratory | In English | → Research institutes |
| GPL | General Public License | In English | → Law, jurisprudence |
| GPLS | Georgia Public Library Service (www.georgialibraries.org) | In English | → Libraries |
| GPME | General-Purpose Mission Equipment | In English | |
| 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 |
| GPPF | Gravitational Plant Physiology Facility | In English | |
| GPR | Ground Penetrating Radar | In English | → Telecommunications |
| GPRN | GOAL Test Procedure Release Notice | In English | → Programming languages → Spaceflight engineering, astronautics |
| GPRP | Government Production Research Property | In English | → Public administration, government |
| GPRS | General Packet Radio Service | In English | → Telecommunications |
| GPS | Ground Power Supply | In English | → Electrical engineering |
| GPS | General Processing Subsystem | In English | → Hardware |
| GPS | Ground Processing Simulation | In English | |
| GPS | Global Positioning System | In English | → Geodesy, cartography → Spaceflight engineering, astronautics → Telecommunications |
| GPSA | Great Plains Sociological Association | In English | → Associations → Sociology |
| 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 |
| GPSS | General-Purpose Simulator System | In English | |
| GPSS | General-Purpose System Simulator | In English | |
| GPTE | General-Purpose Test Equipment | In English | |
| GPU | Ground Power Unit | In English | → Electrical engineering |
| GPUR | GOAL Test Procedure Update Request | In English | → Programming languages → Spaceflight engineering, astronautics |
| GPVEC | Great Plains Veterinary Educational Center | In English | → 07 → Higher education, universities → Veterinary medicine |
| GPVS | General-Purpose Visual Simulator | In English | |
| GR | Ground Rule | In English | |
| GRACE | Ground Radar Calibration Equipment | In English | |
| GRACE | Global Resource Action Center for the Environnement | In English | → Nature |
| GRACE | Gravity Recovery and Climate Experiment | In English | → Physics → Meteorology, climatology |
| GrAeH | Grumman Aerospace Horizons | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| GRAPE | Graphics Programming Environment | In English | → Computer-based techniques → Mathematics |
| GRBS | Greek, Roman and Byzantine Studies | In English | → Serial publications, periodicals |
| GRC | Glenn Research Center | In English | |
| GRD | Ground Detector | In English | |
| GRDDL | Gleaning Resource Descriptions from Dialects of Languages | In English | → Data → Networks, communication |
| GRDDL | Gleaning Ressource Descriptions from Dialects of Languages | In English | → Language, linguistics, literature |
| GRE | Gamma Ray Explorer | In English | → Astronomy → Spaceflight engineering, astronautics |
| GRECC | Geriatric Research, Education and Clinical Center | In English | → Gerontology |
| GReGr | General Relativity and Gravitation | In English | → Serial publications, periodicals → 53012 → 531 |
| GRETIL | Göttingen Register of Electronic Texts in Indian Languages | In English | → Libraries → Literature |
| GRI | Global Reporting Initiative | In English | → Economics |
| GRID | Graphic Retrieval and Information Display | In English | |
| GriO | Griffith Observer | In English | → Serial publications, periodicals → Astronomy |
| GRIP | Greenland Icecore Project | In English | → Earth sciences |
| GRMH | Glasgow Royal Maternity Hospital | In English | → Obstetrics |
| GRN | Goa Research Net | In English | |
| GRO | Gamma Ray Observatory | In English | → Observatories |
| GRPA | Government Performance Results Act | In English | |
| GRPS | General Packet Radio Service | In English | → Telecommunications |
| GRS | Global Receiving System | In English | |
| GRS | GemResearch Swisslab | In English | |
| GRTLS | Glide Return To Launch Site | In English | |
| GS | Ground System | In English | |
| GS | Gas Servicer | In English | |
| GS | Generalized System | In English | |
| GS | Glide Slope | In English | |
| GS | Ground Station | In English | |
| GS | Ground Speed | In English | |
| GSA | General Services Administration | In English | → Management |
| GSA | Georgia Sociological Association | In English | → Associations → Sociology |
| GSA | Gerontological Society of America | In English | → Organizations and associations → Gerontology |
| GSA | Galileo Supervisory Authority | In English | |
| GSAMB | Geological Society of America Bulletin | In English | → Serial publications, periodicals → Earth sciences |
| GSAMm | Geological Society of America Memoir | In English | → Serial publications, periodicals → Earth sciences |
| GSAPS | Graduate School of Asia-Pacific Studies | In English | → Education |
| GSAS | Government Selected Application Systems | In English | → Software |
| GSASP | Geological Society of America Special | In English | → Serial publications, periodicals → Earth sciences |
| GSAT | Geosynchronous Satellite | In English | → Spaceflight engineering, astronautics |
| GSB | Ghana Standards Board | In English | → Standardization |
| GSC | Genome Sequencing Center | In English | → Biological sciences |
| GSC | Guide Star Catalog | In English | → Astronomy |
| GSCU | Ground Service Cooling Unit | In English | |
| GSDL | Ground Software Development Laboratory | In English | → Research institutes → Software |
| GSDS | Goldstone Duplicate Standard | In English | → Standardization |
| GSE | Government Support Equipment | In English | → Public administration, government → Engineering, technology |
| GSE | Ground Servicing Equipment | In English | → Engineering, technology |
| GSE | Ground Support Equipment | In English | → Engineering, technology |
| GSE&I | General Systems Engineering and Integration | In English | → Engineering, technology |
| GSEL | Ground Support Equipment List | In English | |
| GSERD | Ground Support Equipment Recommendation Data | In English | |
| GSF | Gyro Scale Factor | In English | |
| GSFC | Goddard Space Flight Center | In English | → Spaceflight engineering, astronautics |
| GSFC | (NASA) Godddard Space Flight Center | In English | → Spaceflight engineering, astronautics |
| GSI | Glide Slope Indicator | In English | |
| GSI | Government Source Inspection | In English | → Public administration, government |
| GSI | Geographical Survey Institute | In English | → Earth sciences → Geography |
| GSID | Graduate School of International Development | In English | |
| GSIG | Ground Systems Integration Group | In English | |
| GSIU | Ground Standard Interface Unit | In English | → Human-computer interaction |
| GSK | GlaxoSmithKline (www.gsk.com) | In English | → Pharmacology, toxicology |
| GSLS | Ground Station Link Survivability | In English | |
| GSO | Ground Systems Operations | In English | |
| GSO | Ground Support Operations | In English | |
| GSO | Ground Support Office | In English | |
| GSO | Glandular sensory organ(s) | In English | → Biological sciences → Anatomy |
| GSP | Ground Safety Plan | In English | |
| GSPF | Ground Software Production Facility | In English | → Software |
| GSPO | Ground Systems Project Office | In English | |
| GSPR | Guidance Signal Processor-Repeater | In English | |
| GSR | Galvanic Skin Response | In English | |
| GSS | Geosynchronous Space Station | In English | → Spaceflight engineering, astronautics |
| GSS | Government Systems Sector | In English | → Public administration, government |
| GSS | Ground Support Software | In English | → Software |
| GSS | Ground Support System | In English | |
| GSSC | Ground Support Simulation Computer | In English | → Hardware |
| GSSC | General Systems Simulation Center | In English | |
| GSSF | General Service Stock Fund | In English | |
| GSSI | Ground Support System Integration | In English | |
| GSSI&C | Ground Support Systems Installation and Checkout | In English | |
| GSSI&C | Group Support Systems Integration and Checkout | In English | |
| GSSPs | Global Boundary Stratotype Sections and Points | In English | → Stratigraphy |
| GSSS | General Secretariat of Social Security | In English | → Insurance |
| GST | Ground System Test | In English | |
| 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 |
| GSTP | Ground System Test Procedure | In English | |
| GSTS | Ground-Based Surveillance and Tracking System | In English | |
| GSU | Gas Servicer Unit | In English | |
| GSV | Glove Stop Valve | In English | |
| GSVOO | Ground Station Visibility of Orbiting Objects | In English | → Spaceflight engineering, astronautics |
| GSVP | Ground Support Verification Plan | In English | |
| GT | Ground Team | In English | |
| GT | Ground Test | In English | |
| GT | Gyro Torque | In English | |
| GT&A | Ground Test and Acceptance | In English |