Space transport engineering, spaceflight engineering, astronautics, astronautical engineering, cosmonautics, rocketry, spacecraft, rockets and missiles.
| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| GASD | Government Aerospace Systems Division | In English | → Aeronautics, aircraft | 
| GASP | General Ascent Trajectory and Sizing Program | In English | |
| GASPI | Gimbal Angle, Surface Position Indicator | In English | |
| GC | Gimbal Case | In English | |
| GCL | Ground Control Landing | In English | → Aeronautics, aircraft | 
| GDA | General Dynamics Astronautics | In English | |
| GDA | Gimbal Drive Actuator | In English | |
| GDA | Gimbal Drive Assembly | In English | |
| GDTA | Groupement pour le Développement de la Télédétection Aérospatiale | In French | → Organizations and associations → Aeronautics, aircraft  | 
| GEA | Gimbal Electronics Assembly | In English | → Electronics | 
| GEA | Groupe des Écoles Aéronautiques et spatiales | In French | → Organizations and associations → Specialized or polytechnical colleges → Aeronautics, aircraft → France  | 
| GEAESD | General Electric Aerospace Electronics Systems | In English | → Electronics → Aeronautics, aircraft  | 
| GEM | Giotto Extended Mission | In English | |
| GEO | Geosynchronous Earth Orbit | In English | |
| GEO | Group on Earth Observations (www.earthobservations.org) | In English | → Organizations and associations → Earth sciences  | 
| GEO | Geostationary Earth Orbit | In English | |
| GEODSS | Ground-based Electro-Optical Deep-space Surveillance System | In English | |
| GEODSS | Ground-Based Electro-Optical Deep-Space Surveillance | In English | → Electrical engineering | 
| GEOSEPS | Geosynchronous Solar Electric Propulsion Stage | In English | → Electrical engineering | 
| GEOSS | Global Earth Observation System of Systems (www.epa.gov/geoss/) | In English | → Earth sciences | 
| GETL | Ground Elapsed Time of Landing | In English | → Aeronautics, aircraft | 
| GfW | Gesellschaft für Weltraumforschung | In German | → Organizations and associations → Astronomy  | 
| GLAST | Gamma-ray Large Area Space Telescope | In English | → Astronomy | 
| GLOMR | Global Low-Orbiting Message Relay | In English | |
| GME | Gimbal Module Electronics | In English | → Electronics | 
| GMLS | Guided Missile Launching System | In English | → Military engineering | 
| GMS | Geostationary Meterological Satellite | In English | → Meteorology, climatology | 
| GMS | Geostationary Meteorological Satellite | In English | → Meteorology, climatology | 
| GNCFTS | Guidance, Navigation, and Control Flight Test Station | In English | → Aeronautics, aircraft | 
| GOAL | Ground Operations Aerospace Language | In English | → Aeronautics, aircraft | 
| GOCNAE | Grupo de Organização da Comissão Nacional de Atividades Espaciais | In Portuguese | → Astronomy | 
| GOES | Geostationary Operational Environmental Satellite | In English | → Threats to the environment | 
| GOES | Geostationary Operational Environment Satellite | In English | → Earth sciences | 
| GOES | Geosynchronous Operational Environmental Satellite | In English | → Earth sciences | 
| GPD | Gimbal Position Display | In English | |
| GPI | Gimbal Position Indicator | In English | |
| GPL | GOAL Processing Language | In English | → Programming languages | 
| GPRN | GOAL Test Procedure Release Notice | In English | → Programming languages | 
| GPS | Global Positioning System | In English | → Geodesy, cartography → Telecommunications  | 
| GPSCP | GPS (Global Positioning System) Computer Program | In English | → Computer programs → Geodesy, cartography  | 
| GPUR | GOAL Test Procedure Update Request | In English | → Programming languages | 
| GRACE | Gravity Recovery and Climate Experiment (www.csr.utexas.edu/grace/) | In English | → Geophysics → Meteorology, climatology  | 
| GrAeH | Grumman Aerospace Horizons | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft  | 
| GRC | Glenn Research Center (www.grc.nasa.gov) | In English | → Research institutes → Aeronautics, aircraft → United States  | 
| GRE | Gamma Ray Explorer | In English | → Astronomy | 
| GRO | Gamma Ray Observatory | In English | → Observatories | 
| GSA | Galileo Supervisory Authority (https://www.gsa.europa.eu) = GSA | European Global Navigation Satellite Systems Supervisory Authority | In English  | 
In English | → European Union → Geodesy, cartography → Europe  | 
| GSA | European Global Navigation Satellite Systems Supervisory Authority (https://www.gsa.europa.eu) = (look above)  | 
In English | → European Union → Geodesy, cartography → Europe  | 
| GSAT | Geosynchronous Satellite | In English | |
| GSFC | (NASA) Godddard Space Flight Center | In English | → United States | 
| GSFC | Goddard Space Flight Center | In English | |
| GSMaP | Global Satellite Mapping of Precipitation | In English | → Meteorology, climatology → Hydrology  | 
| GSS | Geosynchronous Space Station | In English | |
| GSTAR | Saudi Arabian Communications Satellite | In English | → Telecommunications → Saudi Arabia  | 
| GSTDN | Ground Space Flight Tracking and Data Network | In English | → Astronomy | 
| GSTDN | Ground Spacecraft Tracking and Data Network | In English | → Data → Astronomy  | 
| GSVOO | Ground Station Visibility of Orbiting Objects | In English | |
| GTEPE | Grupo de Trabalho de Estudos e Projetos Espaciais | In Portuguese | → Astronomy | 
| GTO | Geosynchronous Transfer Orbit | In English | |
| GTVI | Gimbal angle and Translational Velocity Indicator | In English | |
| GVSC | Generic VHSIC Spacecraft Computer | In English | → Computer hardware | 
| GX | Galaxy Express | In English | |
| HAA | High-Altitude Abort | In English | |
| HAADS | High-Altitude Attitude Determination System | In English | |
| HAARS | High-Altitude Attitude Reference System | In English | |
| HABP | Hypersonic Arbitrary Body Program | In English | → Aeronautics, aircraft | 
| HAL | Houston Aerospace Language | In English | → Programming languages → Aeronautics, aircraft → United States  | 
| HALCA | Highly Advanced Laboratory for Communications and Astronomy | In English | → Telecommunications → Astronomy  | 
| HALS | High-order Assembly Language for Shuttle | In English | |
| HEAO | High Energy Astronomical Observatory | In English | → Observatories | 
| HEAO | High Energy Astronomy Observatory | In English | → Astronomy | 
| HEO | High Earth Orbit | In English | → Astronomy | 
| HEO | High-Energy Orbit | In English | → Astronomy | 
| HETE | High Energy Transient Explorer | In English | → Astronomy | 
| HF | Horizontal Flight | In English | → Aeronautics, aircraft | 
| HFC | Hydraulic Flight Control | In English | → Aeronautics, aircraft | 
| HFCL | Hydraulic Flight Control Laboratory | In English | → Research institutes → Aeronautics, aircraft  | 
| HFCT | Hydraulic Flight Control Test | In English | → Aeronautics, aircraft | 
| HFS | Horizontal Flight Simulator | In English | → Aeronautics, aircraft | 
| HFT | Horizontal Flight Test | In English | → Aeronautics, aircraft | 
| HFTF | Horizontal Flight Test Facility | In English | → Aeronautics, aircraft | 
| HFTS | Horizontal Flight Test Simulator | In English | → Aeronautics, aircraft | 
| HLLV | Heavy-Lift Launch Vehicle | In English | → Aeronautics, aircraft | 
| HMA | Hypergolic Maintenance Area | In English | → Maintenance and logistics | 
| HMCF | Hypergolic Maintenance and Checkout Facility | In English | → Maintenance and logistics | 
| HMF | Hypergolic Maintenance Facility | In English | → Maintenance and logistics | 
| HMP | Hydrazine Monopropellant | In English | |
| HOTOL | Horizontal Takeoff and Landing | In English | |
| HP | Perigee Altitude | In English | → Aeronautics, aircraft | 
| HPBRM | High Payload Baseline Reference Mission | In English | |
| HPCA | Hot Plasma Composition Analyzer | In English | → Plasma physics → Astronomy  | 
| HPPF | Horizontal Payloads Processing Facility | In English | |
| HRSC | High Resolution Stereo Camera | In English | → Astronomy | 
| HSA | Heat Shield Abort | In English | → Thermodynamics | 
| HSC | House Spacecraft | In English | |
| HSE | Heat Shield Entry | In English | |
| HSF | Hypergolic Servicing Facility | In English | |
| HSRV | Heat-Source Reentry Vehicle | In English | |
| HSSM | Hardened Space Sensor Model | In English | |
| HST | Hubble Space Telescope | In English | → Astronomy | 
| HSTF | Hypergolic System Test Facility | In English | |
| HTO | Horizontal Takeoff | In English | → Aeronautics, aircraft | 
| HTP | Hydroxyl Terminated Propellant | In English | → Chemical technology | 
| HTP | Horizontal Tail Plane | In English | → Aeronautics, aircraft | 
| HYPACE | Hybrid Programmable Attitude Control Electronics | In English | → Electronics | 
| HYSAT | Hybrid Satellite | In English | |
| HYSAT | Hybrid Sensor Experimental Satellite | In English | |
| IA&A | Ingenieria aeronáutica y astronáutica | In Spanish | → Serial publications, periodicals → Aeronautics, aircraft  | 
| IAA | International Aerospace Abstracts | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft  | 
| IACS | Inertial Attitude Control System | In English | |
| IAESM | IEEE (Institute of Electrical and Electronics Engineers) Aerospace Electronic Systems Magazine | In English | → Serial publications, periodicals → Electronics  | 
| IAF | International Astronautical Federation | In English | → Organizations and associations | 
| IBM | Intercontinental Ballistic Missile | In English | → Military engineering | 
| ICAPC | Increased-Capability Adaptive Payload Carrier | In English | |
| ICG | In-Flight Coverall Garment | In English | → Aeronautics, aircraft | 
| ICG | International Committee on GNSS (Global Navigation Satellite Systems) | In English | → Organizations and associations | 
| ICG | International Communications Group (www.icg.aero) | In English | → Telecommunications | 
| IDB | In-Suit Drink Bag | In English | → Beverage industry | 
| IDEAS2 | Independent Design and Evaluation of Advanced Spacecraft | In English | → 6585 | 
| IFA | In-Flight Analysis | In English | → Aeronautics, aircraft | 
| IFM | In-Flight Maintenance | In English | → Maintenance and logistics | 
| IFOT | In-Flight Operations and Training | In English | → Education → Aeronautics, aircraft  | 
| IFS | Integrated Flight Simulator | In English | → Aeronautics, aircraft | 
| IFT | In-Flight Test | In English | → Aeronautics, aircraft | 
| IFTM | In-Flight Test and Maintenance | In English | → Aeronautics, aircraft | 
| IFTS | In-Flight Test System | In English | → Aeronautics, aircraft | 
| IG | Inner Gimbal | In English | |
| IGA | Inner Gimbal Angle | In English | |
| IGAX | Inner Gimbal Axis | In English | |
| IGOS | Interactive Graphic Orbit System | In English | |
| IGS | Intergimbal Assembly | In English | |
| IGSE | In-Space Ground Support Equipment | In English | |
| IIOP | In-Orbit Plane | In English | → Aeronautics, aircraft | 
| IJSC | International Journal of Satellite Communications | In English | → Serial publications, periodicals → Telecommunications  | 
| ILA | Instrument Landing Approach | In English | → Aeronautics, aircraft | 
| ILAS | Instrument Landing Approach System | In English | → Aeronautics, aircraft | 
| ILC | Initial Launch Capability | In English | |
| ILRS | International Laser Ranging Service (http://https://ilrs.cddis.eosdis.nasa.gov/) | In English | → Geodesy, cartography | 
| ILRV | Integral Launch and Reentry Vehicle | In English | |
| ILS | Instrument Landing System | In English | → Aeronautics, aircraft | 
| ILSSE | Integrated Life Science Shuttle Experiment | In English | → Biological sciences | 
| IMASSA | Institut de Médecine Aérospatiale - Service de Santé des Armées | In French | → Medicine → Aeronautics, aircraft  | 
| IMLEO | Initial Mass in Low Earth Orbit | In English | → Astronomy | 
| IMP | Inflatable Micrometeoroid Paraglider | In English | → Astronomy | 
| IMS | Interplanetary Monitor Satellite | In English | → Astronomy | 
| IMSO | International Mobile Satellite Organization | In English | → Associations → Telecommunications  | 
| IMSS | In-Flight Medical Supply System | In English | → Medicine → Aeronautics, aircraft  | 
| INCAS | Institutul Naţional de Cercetare-Dezvoltare Aerospaţială | In Romanian | → Astronomy → Aeronautics, aircraft  | 
| InJAE | Indian Journal of Aerospace Engineering Division | In English | → Serial publications, periodicals → Aeronautics, aircraft → India  | 
| INMARSAT | International Maritime Satellite | In English | → Marine research, oceanography | 
| INPE | Instituto de Pesquisas Espaciais | In Portuguese | → Astronomy | 
| INSAT | India Communications Satellite | In English | → Telecommunications → India  | 
| INSIGHT | Interior exploration using Seismic Investigations, Geodesy and Heat Transport | In English | → Planets and satellites → Seismology, earthquakes  | 
| INTA | Instituto Nacional de Técnica Aeroespacial (www.inta.es) | In Spanish | → Astronomy → Aeronautics, aircraft → Spain  | 
| INTEGRAL | INTErnational Gamma-Ray Astrophysics Laboratory | In English | → Astronomy | 
| INTELSAT | International Telecommunications Satellite | In English | → Telecommunications | 
| IntSM | Interavia Space Markets | In English | → Serial publications, periodicals → Aeronautics, aircraft  | 
| IOBM | In Ocean By Mistake | In English | |
| IOC | In-Orbit Checkout and Calibration | In English | |
| IOD | Initial Orbit Determination | In English | |
| IOF | Initial Operational Flight | In English | → Aeronautics, aircraft | 
| IP | Instructor Pilot | In English | → Education → Aeronautics, aircraft  | 
| IP | Instrument Payload | In English | |
| IPACS | Integrated Power and Attitude Control System | In English | |
| IPAD | Integrated Program for Aerospace Vehicle Design | In English | → Aeronautics, aircraft | 
| IRANSAT | Iranian government communications satellite | In English | → Telecommunications | 
| IRAS | Infrared Astronomical Satellite | In English | → Astronomy | 
| IRBS | Intermediate-Range Booster System | In English | |
| IRCFE | Infrared Communications Flight Experiment | In English | → Telecommunications | 
| IRR | Integral Rocket Ramjet | In English | |
| IS | Integrated Satellite | In English | |
| ISAE | Institut Supérieur de l'Aéronautique et de l'Espace (www.isae.fr) | In French | → Specialized or polytechnical colleges → Aeronautics, aircraft → France  | 
| ISAS | Institute of Space and Astronautical Science (www.isas.jaxa.jp) | In English | → Research institutes → Astronomy → Japan  | 
| ISATS | Integration Spacecraft Automated Test System | In English | |
| ISBRv | International Space Business Review | In English | → Serial publications, periodicals → Astronomy  | 
| ISCCP | International Satellite Cloud Climatology Project (http://isccp.giss.nasa.gov) | In English | → Meteorology, climatology | 
| ISF | Industrial Space Facility | In English | → Astronomy | 
| ISI | Integral Satcom Initiative | In English | |
| ISO | Infrared Space Observatory | In English | → Astronomy | 
| ISRO | Indian Space Research Organisation (www.isro.org) | In English | → Research institutes → Astronomy → India  | 
| ISS | International Space Station | In English | |
| IsSRT | Israel Space Research and Technology Information Bulletin | In English | → Serial publications, periodicals → Astronomy  | 
| ISZ | Iskusstvenniy Sputnik Zemli | In Russian | |
| ITAES | IEEE (Institute of Electrical and Electronics Engineers) Transactions on Aerospace Electronic Systems | In English | → Serial publications, periodicals → Electronics  | 
| ITMG | Integrated Thermal/Micrometeoroid Garment | In English | |
| IUE | International Ultraviolet Explorer | In English | → Astronomy | 
| IUS | Inertial Upper Stage | In English | |
| IVSI | Instantaneous Vertical Speed Indicator | In English | |
| IWF | Institut für Weltraumforschung (www.iwf.oeaw.ac.at) | In German | → Research institutes → Astronomy → Austria  | 
| JAerE | Journal of Aerospace Engineering | In English | → Serial publications, periodicals → Aeronautics, aircraft  | 
| JAerP | Journal of Aerospace Power | In English | → Serial publications, periodicals → Electrical engineering → Aeronautics, aircraft  | 
| JANNAF | Joint Army, Navy, NASA, Air Force | In English | → Military affairs → United States  | 
| JAnSc | Journal of Astronautical Sciences | In English | → Serial publications, periodicals | 
| JAS | Journal of Aerospace Science | In English | → Serial publications, periodicals → Aeronautics, aircraft  | 
| JAXA | Japan Aerospace Exploration Agency (www.jaxa.jp) | In English | → Central administration → Astronomy → Aeronautics, aircraft → Japan  | 
| JERS | Japanese Earth Resources Satellite | In English | → Earth sciences → Japan  | 
| JFACT | Joint Flight Acceptance Composite Test | In English | → Quality management → Aeronautics, aircraft  | 
| JOP | Jupiter Orbiter Probe | In English | → Astronomy | 
| JP | Jet Propellant | In English | → Aeronautics, aircraft | 
| JPAS | Journal of Practical Applications in Space | In English | → Serial publications, periodicals |