| GTV | Ground Transport Vehicle | In English | → Vehicle engineering |
| 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 |
| 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 |
| HAADS | High-Altitude Attitude Determination System | In English | → Spaceflight engineering, astronautics |
| HAARS | High-Altitude Attitude Reference System | In English | → Spaceflight engineering, astronautics |
| 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 | Holloman Air Force Base | In English | → 358 → Aeronautics, aircraft |
| HAFB | Hill 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 |
| HANE | High-Altitude Nuclear Explosion | In English | → Nuclear technology → Military engineering |
| HCHy | Hovering Craft and Hydrofoil | In English | → Serial publications, periodicals → Vehicle engineering |
| HCP | Hydraulic Circulation Pump | In English | → Mechanical engineering |
| HCST | Haut Conseil de la Science et de la Technologie | In French | → Mathematics and natural sciences |
| 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 |
| HEACE | Health Effect of Aircraft Cabin Environment | In English | → Medicine → Aeronautics, aircraft → Transport and postal services |
| HEDI | High Endoatmospheric Defense Interceptor | In English | → Military engineering |
| HEDSIM | High Endoatmospheric Defense System Simulator | In English | → Computer simulation → Military engineering |
| HEI | Hautes Études Industrielles | In French | → Specialized or (poly)technical colleges |
| HEMT | High Electron Mobility Transistor | In English | → Electronics |
| HEO | High-Energy Orbit | In English | → Astronomy → Spaceflight engineering, astronautics |
| HEO | High Earth Orbit | In English | → Astronomy → Spaceflight engineering, astronautics |
| HEOO | Honeywell Electro-Optical Operations | In English | → Electrical engineering |
| HEOR | Historical Event Operation Record | In English | |
| HESC | Hemispheric Energy Steering Committee = CDEH | Comité Directivo para la Energía del Hemisferio | In Spanish = CDEH | Comité Directeur pour l'Énergie dans l'Hémisphère | In French = CDEH | Comitê Diretor para a Energia do Hemisfério | In Portuguese |
In English | → International economic cooperation → Energy economics |
| HEW | Hamburgische Elektrizitätswerkstatt | In German | → Electrical engineering |
| HF | Horizontal Flight | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFC | Hydraulic Flight Control | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFCL | Hydraulic Flight Control Laboratory | In English | → Research institutes → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFCT | Hydraulic Flight Control Test | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFCV | Helium Flow Control Valve | In English | → Mechanical engineering |
| HFE | Human Factors Engineering | In English | |
| HFMP | Human Factors Management Plan | In English | → Management |
| HFP | Hydrogen and Fuel Cell Platform (www.hfpeurope.org) | In English | → Organizations and associations → Energy economics |
| HFS | Horizontal Flight Simulator | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFT | Horizontal Flight Test | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFTE | Human Factors Test and Engineering | In English | |
| HFTF | Horizontal Flight Test Facility | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HFTS | Horizontal Flight Test Simulator | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HIAD | Handbook of Information for Aircraft Designers | In English | → Aeronautics, aircraft |
| HIAD | High-Altitude Defense Program | In English | → Military affairs → Military engineering → Aeronautics, aircraft |
| HICAMP | Highly Calibrated Airborne Measurements Program | In English | → Aeronautics, aircraft |
| HIMAT | History of Mining Activities in the Tyrol | In English | → Mining → History |
| HiMAT | Highly Maneuverable Aircraft Technology | In English | → Aeronautics, aircraft |
| HiTec | High Technology | In English | → Serial publications, periodicals |
| HKV | Hit-To-Kill Vehicle | In English | → Vehicle engineering |
| HLLV | Heavy-Lift Launch Vehicle | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HLLW | High Level Liquid Waste | In English | → Environmental technology, water supply, waste management |
| HLV | Hybrid Launch Vehicule | In English | → Vehicle engineering |
| HMA | Hypergolic Maintenance Area | In English | → Maintenance and logistics → Vehicle engineering |
| HMC | Hybrid Microcircuit | In English | → Electronics |
| HMCF | Hypergolic Maintenance and Checkout Facility | In English | → Maintenance and logistics → Vehicle engineering |
| HMF | Hypergolic Maintenance Facility | In English | → Maintenance and logistics → Vehicle engineering |
| HMP | Hydrazine Monopropellant | In English | → Spaceflight engineering, astronautics |
| HOFCO | Horizontal Functional Checkout | In English | |
| HOTOL | Horizontal Takeoff and Landing | In English | → Spaceflight engineering, astronautics |
| HP | Handling Procedure | In English | |
| HP | Horsepower | In English | → Electrical engineering |
| HP | Perigee Altitude | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HPA | High-Power Amplifier | In English | → Electrical engineering |
| HPFT | High-Pressure Fuel Turbopump | In English | → Vehicle engineering |
| HPM | High-Performance Motor | In English | → Mechanical engineering → Vehicle engineering |
| HPP | High Performance Polymers | In English | → Serial publications, periodicals → Materials science → 620039 |
| HPPF | Horizontal Payloads Processing Facility | In English | → Spaceflight engineering, astronautics |
| HPR | Hydrogen Pressure Regulator | In English | → Electrical engineering |
| HPRV | Hydrogen Pressure Relief Valve | In English | → Electrical engineering |
| HQE | Haute Qualité Environnementale | In French | → Quality management → Nature and society → Environmental technology, water supply, waste management |
| HRDM | High-Rate Demultiplexer | In English | → Electronics |
| HRH | Holdfast Rubber Highway | In English | → Civil engineering and land transport → Plastic industry |
| HRI | Honda Research Institute | In English | → Vehicle engineering |
| HRSC | High Resolution Stereo Camera | In English | → Astronomy → Spaceflight engineering, astronautics |
| HSC | House Spacecraft | In English | → Spaceflight engineering, astronautics |
| HSC | Hierarchical Storage Controller | In English | |
| HSCU | Hydraulic Supply and Checkout Unit | In English | → Mechanical engineering |
| HSE | Heat Shield Entry | In English | → Spaceflight engineering, astronautics |
| HSF | Hypergolic Servicing Facility | In English | → Vehicle engineering |
| HSRV | Heat-Source Reentry Vehicle | In English | → Spaceflight engineering, astronautics |
| HSS | High Stress/Strain | In English | → Mechanical engineering |
| HSSM | Hardened Space Sensor Model | In English | → Spaceflight engineering, astronautics |
| HST | Hubble Space Telescope | In English | → Astronomy → Spaceflight engineering, astronautics |
| HST | High Speed Train | In English | → Rail transport engineering |
| HSTF | Hypergolic System Test Facility | In English | → Vehicle engineering |
| HSV | Hypersonic Vehicle | In English | → Vehicle engineering |
| HT | High Technology | In English | |
| HTGR | High Temperature Gas Cooled Reactor | In English | → Nuclear technology |
| HTH | Heavy Transport Helicopter | In English | → Aeronautics, aircraft |
| HTO | Horizontal Takeoff | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HTP | Hydroxyl Terminated Propellant | In English | → Spaceflight engineering, astronautics → Chemical technology |
| HTP | Horizontal Tail Plane | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| HTR | High Temperature Reactor | In English | → Nuclear technology |
| HTrEn | Heat Transfer Engineering | In English | → Serial publications, periodicals → Thermodynamics |
| HUFEB | Hokkaido University Faculty Engineering Bulletin | In English | → Serial publications, periodicals |
| HUFEM | Hokkaido University Faculty Engineering Memoirs | In English | → Serial publications, periodicals |
| HVE | High-Voltage Electronics | In English | → Electronics |
| HVM | Hydraulic Valve Module | In English | → Mechanical engineering |
| HVM | Hypervelocity Missile | In English | → Military engineering |
| HVPS | High-Voltage Power Supply | In English | → Electrical engineering |
| HVSF | Honeywell Verification Simulation Facility | In English | |
| HX | Heat Exchanger | In English | → Electrical engineering |
| HYPACE | Hybrid Programmable Attitude Control Electronics | In English | → Electronics → Spaceflight engineering, astronautics |
| HYSAT | Hybrid Satellite | In English | → Spaceflight engineering, astronautics |
| HYSAT | Hybrid Sensor Experimental Satellite | In English | → Spaceflight engineering, astronautics |
| I+D | Investigación y Desarrollo = R&D | Recherche et développement | In French = F&E | Forschung und Entwicklung | In German = R&D | Research and Development | In English = R&S | Ricerca e Sviluppo | In Italian = P&D | Pesquisa e Desenvolvimento | In Portuguese = O&O | Onderzoek en Ontwikkeling | In Dutch = FoU | Forsøk og Utvikling | In Norwegian |
In Spanish | → Research policy |
| I-SWARM | Intelligent Small World Autonomous Robots for Micromanipulation | In English | → Mechanical engineering |
| IA&A | Ingenieria aeronáutica y astronáutica | In Spanish | → Serial publications, periodicals → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IAA | International Aerospace Abstracts | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| IAAE | Internacia Agentejo pri Atom-Energio (www.iaea.org) = IAEA | International Atomic Energy Agency | In English = AIEA | Agence Internationale de l'Énergie Atomique | In French = AIEA | Agenţia Internaţională pentru Energie Atomică | In Romanian = МААЕ | Международна агенция за атомна енергия | In Bulgarian = AIEA | Agència Internacional de l'Energia Atòmica | In Catalan = MAAE | Mezinárodní agentura pro atomovou energii | In Czech = IAEA | Det Internationale Atomenergiagentur | In Danish = IAEO | Internationale Atomenergieorganisation | In German = OIEA | Organismo Internacional de Energía Atómica | In Spanish = סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית | In Hebrew = IAEA | International Atomenergie Agence | In Letzeburgesh = AIEA | Agenzia Internazionale per l'Energia Atomica | In Italian = IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण | In Hindi = MAAE | Меѓународна агенција за атомска енергија | In Macedonian = МАГАТЭ | Международное агентство по атомной энергии | In Russian = AIEA | Agência Internacional de Energia Atómica | In Portuguese = MAEA | Międzynarodowa Agencja Energii Atomowej | In Polish = МАГАТЕ | Міжнародне агентство з атомної енергії | In Ukrainian = UAEA | Uluslararası Atom Enerji Ajansı | In Turkish = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Esperanto | → International relations → Energy economics → Nuclear technology |
| IACO | Installation, Assembly, and Checkout | In English | |
| IACO | International Aviation COnsulting | In French | → 3592 → Aeronautics, aircraft |
| IACS | Inertial Attitude Control System | In English | → Spaceflight engineering, astronautics |
| IadEn | Iadernaia Energiia = IadEN | ядерная энергия | In Russian |
In Russian | → Serial publications, periodicals → Nuclear, atomic, and molecular physics → Nuclear technology |
| IadEN | ядерная энергия = IadEn (look above) |
In Russian | → Serial publications, periodicals → Nuclear, atomic, and molecular physics → Nuclear technology |
| IAEA | International Atomic Energy Agency (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In English | → International relations → Energy economics → Nuclear technology |
| IAEA | Det Internationale Atomenergiagentur (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Danish | → International relations → Energy economics → Nuclear technology |
| IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Hindi | → International relations → Energy economics → Nuclear technology |
| IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Thai | → International relations → Energy economics → Nuclear technology |
| IAEA | International Atomenergie Agence (www.iaea.org) = IAAE, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In Letzeburgesh | → International relations → Energy economics → Nuclear technology |
| IAEO | Internationale Atomenergieorganisation (www.iaea.org) = IAAE, IAEA, AIEA, МААЕ, MAAE, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, UAEA, EANA (look above) |
In German | → International relations → Energy economics → Nuclear technology |
| IAESM | IEEE (Institute of Electrical and Electronics Engineers) Aerospace Electronic Systems Magazine | In English | → Serial publications, periodicals → Electronics → Spaceflight engineering, astronautics |
| IAF | International Astronautical Federation | In English | → Organizations and associations → Spaceflight engineering, astronautics |
| IAHR | International Association of Hydraulic Engineering and Research | In English | → Associations → Environmental technology, water supply, waste management |
| IAHS | International Association of Hydraulical Sciences | In English | → Associations → Environmental technology, water supply, waste management |
| IAIN | International Association of the Navigation Institutes | In English | → Associations → Geodesy, cartography → Vehicle engineering |
| IALANA | International Association of Lawyers Against Nuclear Arms | In English | → Associations → Law, jurisprudence → Nuclear technology → Applied sciences, technology |
| IAM | International Association of Machinists | In English | → Associations → Mechanical engineering |
| IANT | International Advances in Nondestructive Testing | In English | → Serial publications, periodicals |
| IAO | Ingénierie Assistée par Ordinateur | In French | → Computer-based techniques |
| IAP | Institut Algérien du Pétrole | In French | → Specialized or (poly)technical colleges → Mining → 665 |
| IAPU | Improved Auxiliary Power Unit | In English | → Electrical engineering |
| IAS | Institute of Aeronautical Sciences | In English | → Aeronautics, aircraft |
| IAS | Integrated Avionics Subsystem | In English | → Aeronautics, aircraft |
| IAT | Integrated Avionics Test | In English | → Aeronautics, aircraft |
| IBEW | International Brotherhood of Electrical Workers | In English | → Organizations and associations → Electrical engineering |
| IC | Integrated Circuit | In English | → Electronics |
| IC | Internal Combustion | In English | → Mechanical engineering |
| ICA | Ingénieur du Contrôle Aérien | In French | → Aeronautics, aircraft → Transport and postal services |
| ICAE | Integrated Computer-Aided Engineering | In English | → Serial publications, periodicals → Computer-based techniques |
| ICAITI | Instituto Centroamericano de Investigación y Tecnología | In Spanish | → Research institutes → Research policy |
| ICAM | Integrated Computer-Aided Manufacturing | In English | → Computer-based techniques |
| ICAM | Institut Catholique d'Arts et Métiers | In French | → Roman catholic church → Specialized or (poly)technical colleges |
| ICAO | International Civil Aviation Organization = IOCA | Internacia Organizo pri Civila Aviado | In Esperanto |
In English | → Organizations and associations → Aeronautics, aircraft → Transport and postal services |
| ICAOB | ICAO Bulletin (International Civil Aviation Organization) | In English | → Serial publications, periodicals → Aeronautics, aircraft → Transport and postal services |
| ICAR | Incubateur de Champagne-Ardenne (www.icar-incubateur.fr) | In French | |
| ICARE | Instrumentation, Commande et Architecture des Robots Évolués | In French | → Electronics |
| ICB | International Centre of Biocybernetics | In English | → Research institutes → Computer science → Electronics |
| ICBM | Intercontinental Ballistic Missile | In English | → Military engineering |
| ICC | Integrated Circuit(s) Cards | In English | → Electronics |
| ICE | Ideal Cabin Environment | In English | → Aeronautics, aircraft |
| ICG | In-Flight Coverall Garment | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ICID | International Commission for Irrigation and Drainage = CIID | Commission Internationale pour les Irrigations et le Drainage | In French |
In English | → Organizations and associations → 627 → Agricultural sciences |
| ICID | International Commission on Irrigation and Drainage | In English | → Organizations and associations → Agricultural sciences → Environmental technology, water supply, waste management |
| ICiSM | IEEE (Institute of Electrical and Electronics Engineers) Circuits Systems Magazine | In English | → Serial publications, periodicals → Electronics |
| ICMAB | Instituto de Ciencia de Materiales de Barcelona (www.icmab.es) | In Spanish | → Research institutes → Materials science |
| ICMI | Inductive Components Manufacturing Inc. (www.icmiinc.com) | In English | → Electrical engineering |
| ICMS | Ingénierie et Contrôle des Matériaux et des Structures | In French | → Materials science → Mechanical engineering |
| ICOLD | International Commission on Large Dams (www.icold-cigb.org) | In English | → Organizations and associations → 627 |
| ICOUR | Irrigation Company for the Upper Regions | In English | → 627 → Agricultural sciences |
| ICPDR | International Commission for the Protection of the Danube River | In English | → Organizations and associations → Nature and society → 627 |
| ICPS | International Conference on the Physics of Semiconductors | In English | → Congresses → Electricity, magnetism, electromagnetism → 539 → Electrical engineering |
| ICR | Inductance, Capacitance, and Resistance | In English | → Physics → Electrical engineering |
| ICRP | International Commission on Radiological Protection | In English | → Nuclear technology |
| ICRU | International Commission on Radiation Units and Measurements = CIUMR | Comisión Internacional de Unidades y Medidas Radiológicas | In Spanish = CIUMR | Commission Internationale des Unités et des Mesures de Radiation | In French = CIUMR | Comissão Internacional de Unidades e Medidas Radiação | In Portuguese |
In English | → Standardization → Nuclear technology |
| ICS | Intelligent Control Systems | In English | |
| ICSE | Impact of Computing in Science and Engineering | In English | → Serial publications, periodicals → Computer science → Mathematics and natural sciences |
| ICSTI | International Council for Scientific and Technical Information | In English | → Libraries → Mathematics and natural sciences |
| ICTAF | Interdisciplinary Center for Technology Analysis & Forecasting | In English | |
| ICTAF | Interdisciplinary Center for Technological Analysis & Forecast | In English | → Energy economics |
| IDA | Integrated Display Assembly | In English | → Human-computer interaction → Electronics |
| IDA | Irrigation Development Authority | In English | → 627 → Agricultural sciences |
| IDAE | Instituto para la Diversificación y Ahorro de la Energía | In Spanish | → Energy economics |
| IDB | In-Suit Drink Bag | In English | → Spaceflight engineering, astronautics → Beverage industry |
| IDEA | Inventer la Distribution Électrique de l'Avenir | In French | → Electrical engineering |
| IDEAS2 | Independent Design and Evaluation of Advanced Spacecraft | In English | → Spaceflight engineering, astronautics → 6585 |
| IDITE | Instituto de Desenvolvimento e Inocaçao Tecnológica | In Portuguese | |
| IDN | Institut Industriel du Nord | In French | → Specialized or (poly)technical colleges |
| IDS | Integrated Defense Simulator | In English | → Military engineering |
| IDSNET | Integrated Defense System Network | In English | → Military affairs → Military engineering → Networks, communication |
| IDSNET | Integrated Defense Simulator Network | In English | → Military engineering → Networks, communication |
| IDsW | InformatieDesk standaarden Water | In Dutch | → Environmental technology, water supply, waste management |
| IDTA | Interdivisional Technical Agreement | In English | |
| IE | Ion-Etching | In English | |
| IEA | Integrated Electronic Assembly | In English | → Electronics |
| IEA | Internationale Energieagentur = AIE | Agence Internationale de l'Énergie | In French = IEA | International Energy Agency | In English = МЭА | Международное энергетическое агентство | In Russian = MAE | Międzynarodowa Agencja Energii[edytuj] | In Polish = IEA | Internationaal Energie Agentschap | In Dutch = IEA | 国際エネルギー機関 | In Japanese = AIE | Agencia Internacional de la Energía | In Spanish |
In German | → International relations → Energy economics |
| IEA | Ingénieur de l’Électronique Aéronautique | In French | → Electronics → Aeronautics, aircraft → Transport and postal services |
| IEA | Internationaal Energie Agentschap = AIE, МЭА, MAE (look above) |
In Dutch | → International relations → Energy economics |
| IEA | International Energy Agency = AIE, МЭА, MAE (look above) |
In English | → International relations → Energy economics |
| IEA | 国際エネルギー機関 = AIE, МЭА, MAE (look above) |
In Japanese | → International relations → Energy economics |
| IEC | International Electrotechnical Commission = CEI | Comisión Electrotécnica Internacional | In Spanish = CEI | Commission Électrotechnique Internationale | In French = CEI | Comissão Eletrotécnica Internacional | In Portuguese |
In English | → Electrical engineering |
| IECCAB | IEC (International Electrotechnical Commission) Conformity Assessment Board | In English | → Electrical engineering |
| IECO | Inboard Engine Cutoff | In English | → Mechanical engineering |
| IED | Innovation Énergie Développement | In French | → Energy economics |
| IEDL | IEEE (Institute of Electrical and Electronics Engineers) Electron Device Letters | In English | → Serial publications, periodicals → Electronics |
| IEE | Institution of Electrical Engineers | In English | → Electrical engineering |
|