| CHARTH | Compagnie Holding d'Applications et de Réalisations Thermiques et Hydrauliques | In French | → Organizations and associations → Energy economics |
| CHIR | Chirurgie, Informatique et Robotique | In French | → Computer science → Surgery, orthopaedics, ophthalmology → Electronics |
| ChSMJ | Chinese Society of Mechanical Engineers Journal | In English | → Serial publications, periodicals |
| CIE | Commission Internationale de l'Éclairage | In French | → Electrical engineering |
| CIGRE | Conférence Internationale des Grands Réseaux Électriques à haute tension | In French | → Organizations and associations → Electrical engineering |
| CIH | Centre d’Ingénierie Hydraulique | In French | |
| CIINB | Commission Interministérielle des Installations Nucléaires de Base | In French | → Organizations and associations → Central administration → Nuclear technology |
| CIM | Computer-Integrated Manufacturing | In English | → Hardware → Electronics |
| CIMAC | Conseil International des Machines à Combustion | In French | → Organizations and associations |
| CIPN | Centre d’Ingénierie du Parc Nucléaire en exploitation | In French | → Nuclear technology |
| CIPR | Commission Internationale de Protection Radiologique | In French | → Nuclear technology |
| CIPREL | Compagnie Ivoirienne de PRoduction d’ÉLectricité | In French | → Electrical engineering |
| CIRA | Contrôle Industriel et Régulation Automatique | In French | → Specialized or (poly)technical colleges |
| CIS | Contact Image Sensor | In English | → Electronics |
| CIUMR | Commission Internationale des Unités et des Mesures de Radiation = ICRU | International Commission on Radiation Units and Measurements | In English = CIUMR | Comisión Internacional de Unidades y Medidas Radiológicas | In Spanish = CIUMR | Comissão Internacional de Unidades e Medidas Radiação | In Portuguese |
In French | → Standardization → Nuclear technology |
| CIUMR | Comissão Internacional de Unidades e Medidas Radiação = ICRU (look above) |
In Portuguese | → Standardization → Nuclear technology |
| CIUMR | Comisión Internacional de Unidades y Medidas Radiológicas = ICRU (look above) |
In Spanish | → Standardization → Nuclear technology |
| CJE | Compteur Jaune Électronique | In French | → Electrical engineering |
| CJECE | Canadian Journal of Electrical Computer Engineering | In English | → Serial publications, periodicals → Computer science → Electrical engineering |
| CLE | Compteur Libre Énergie | In French | → Energy economics → Electrical engineering |
| CMAME | Computer Methods in Applied Mechanics and Engineering | In English | → Serial publications, periodicals → Computer science → 531 |
| CMOS | Complementary Metal Oxide Semiconductor | In English | → Electronics |
| CMS | Composants à Montage de Surface | In French | → Electronics |
| CNDRI | Contrôle Non Destructif par Rayonnements Ionisants | In French | |
| CNEA | Comisión Nacional de Energía Atómica (www.cnea.gov.ar) | In Spanish | → Central administration → Nuclear technology |
| CNEN | Centre National d’Équipement Nucléaire | In French | → Energy economics → Nuclear technology |
| CNEPE | Centre National d’Équipement de Production d’Électricité | In French | → Electrical engineering |
| CNES | Centre National d’Exploitation du Système | In French | → Electrical engineering |
| CNFM | Comité National Français de la Mécanique | In French | → Organizations and associations |
| CNIR | Centre National d’Ingénierie du Réseau | In French | → Electrical engineering |
| CNPE | Centre Nucléaire de Production d’Électricité | In French | → Nuclear technology → Electrical engineering |
| CNS | Canadian Nuclear Society (www.cns-snc.ca) | In English | → Organizations and associations → Nuclear, atomic, and molecular physics → Nuclear technology |
| CNWDI | Critical Nuclear Weapons Design Information | In English | → Nuclear technology → Military engineering |
| COB | Chip On Board | In English | → Electronics |
| COC | Chip On Chip | In English | → Electronics |
| COF | Chip On Flex | In English | → Electronics |
| COGEMA | Compagnie Générale des Matières Nucléaires | In French | → Mining → Nuclear technology |
| COGETHERM | COmpagnie française pour la coGÉnération THERMique | In French | → Energy economics → Electrical engineering |
| COMEGO | Compañía Mexicana de Gerencia y Operación | In Spanish | → Energy economics → Electrical engineering |
| COREM | Comité de Coordination des Centres de Recherches en Mécanique | In French | → 531 |
| CoRWM | Committee on Radioactive Waste Management (www.corwm.org.uk) | In English | → Organizations and associations → Nuclear technology → Environmental technology, water supply, waste management |
| COTEFE | Comité Technique de coordination de la Filière Électronique | In French | → Electronics |
| CPL | Courant Porteur en Ligne | In French | → Electrical engineering → Telecommunications |
| CPLD | Complex Programmable Logic Device | In English | → Hardware → Electronics |
| CPT | Centre de Production Thermique | In French | → Electrical engineering |
| CRHEA | Centre de Recherche sur l'Hétéroépitaxie et ses Applications | In French | → Electronics |
| CRT | Cathode Ray Tube | In English | → Electronics → Telecommunications |
| CSEG | Conseil Supérieur de l’Électricité et du Gaz | In French | → Energy economics → Electrical engineering |
| CSNE | Comité Sûreté Nucléaire en Exploitation | In French | → Nuclear technology |
| CSSIN | Conseil Supérieur de la Sûreté et de l’Information Nucléaire | In French | → Organizations and associations → Nuclear technology |
| CTBTO | Comprehensive Nuclear-Test-Ban Treaty Organization | In English | → Organizations and associations → International relations → Nuclear technology |
| CTI | Comitato Termotecnico Italiano | In Italian | |
| CUE | Command Uplink Electronics | In English | → Electronics |
| CVCS | Chemical and Volume Control System | In English | → Nuclear technology |
| CWE | Caution and Warning Electronics | In English | → Electronics |
| CWEA | Caution and Warning Electronic(s) Assembly | In English | → Electronics |
| CWEU | Caution and Warning Electronic(s) Unit | In English | → Electronics |
| DAC | Digital-To-Analog Converter | In English | → Computer science → Electronics |
| DAD | Détecteur Autonome Déclencheur | In French | → Electrical engineering |
| DANASAT | Direct-Ascent Nuclear ASAT | In English | → Nuclear technology |
| DANCE | Département Appui à la Négociation pour la Commercialisation de l'Électricité | In French | → Electrical engineering |
| DATR | Directement Affecté aux Travaux sous Rayonnements | In French | → Nuclear technology |
| DCE | Data and Control Electronics | In English | → Electronics |
| DCEA | Digital Control Electronics Assembly | In English | → Electronics |
| DCN | Division Combustibles Nucléaires | In French | → Electrical engineering → Nuclear technology |
| DCSD | Département Commande des Systèmes et Dynamique du vol | In French | → Electronics → Aeronautics, aircraft |
| DE | Display Electronics | In English | → Electronics |
| DEA | Digital Electronics Assembly | In English | → Electronics |
| DEA | Display Electronics Assembly | In English | → Electronics |
| DEA | Deployed Electronics Assembly | In English | → Electronics |
| DEEE | Déchets des équipements électriques et électroniques = WEEE | Waste Electrical and Electronic Equipment | In English |
In French | → Electrical engineering → Electronics → Environmental technology, water supply, waste management |
| DEEIT | Division de l'Électricité, de l'Électromécanique, de l'Informatique et des Télécommunications | In French | → Computer science → Electrical engineering → Electronics → 65 |
| DefEl | Defense Electronics | In English | → Serial publications, periodicals → Military affairs → Electronics → Military engineering |
| DEFF | Danmarks Elektroniske Forskningsbibliotek | In Danish | → Libraries → Electronics |
| DEHOMAG | DEutsche HOllerith MAschinen Gesellschaft | In German | |
| DEI | Direction de l'Électronique et de l'Informatique | In French | → Computer science → Electronics |
| DEMAR | Déambulation et Mouvement Artificiel | In French | → Anatomy |
| DÉMÁSZ | Dél-magyarországi Áramszolgáltató Részvénytársaság | In Hungarian | → Energy economics → Electrical engineering |
| DEMKO | Danmarks Elektriske Materielkontrol | In Danish | → Electrical engineering |
| DEP | Display Electronics Package | In English | → Electronics |
| DEPT | Direction Électricité Production Transports | In French | → Electrical engineering |
| DES | Département d’Évaluation de la Sûreté | In French | → Central administration → Nuclear technology |
| DeScE | Defense Science Electronics | In English | → Serial publications, periodicals → Military affairs → Electronics → Military engineering |
| DEU | Digital Electronics Unit | In English | → Electronics |
| DEU | Display Electronics Unit | In English | → Electronics |
| DGSRN | Direction Générale de la Sûreté et de la Radioprotection Nucléaire | In French | → Central administration → Nuclear technology |
| DHS | Département Hyperfréquences et Semiconducteurs | In French | → Electronics → Telecommunications |
| DICE | Danube Integrated Circuit Engineering | In English | → Electronics |
| DIE | Division Industrielle Électricité | In French | → Electrical engineering |
| DIELI | Direction des Industries Électroniques et de l'Informatique | In French | → Computer science → Electronics |
| DIEU | Digital Interface Electronics Unit | In English | → Human-computer interaction → Electronics |
| DIGEC | Direction de l’Industrie, du Gaz, de l’Électricité et du Charbon | In French | → Central administration → Energy economics → Electrical engineering → Mining |
| DIN | Division Ingénierie Nucléaire | In French | → Nuclear technology |
| DIP | Déficit Immunitaire Primitif | In French | → 621017 → Pathology |
| DIP | Dual In-line Package | In English | → Electronics |
| DIRCEN | Direction des Centres d'Expérimentations Nucléaires | In French | → Nuclear technology |
| DKE | Deutsche Kommission Elektrotechnik, Elektronik, Informationstechnik im DIN und VDE | In German | → Organizations and associations → Computer science → Electrical engineering → Electronics |
| DMA | Dose Maximale Admissible | In French | → Nuclear technology |
| DMS | Docking Mechanism Subsystem | In English | |
| DMS | Docking Module System | In English | |
| DNA | Defense Nuclear Agency | In English | → Military affairs → Nuclear technology |
| DNS | Departure Nuclear Stage | In English | → Nuclear technology |
| DOAAT | Direction Optimisation Amont/Aval et Trading | In French | → Electrical engineering |
| DPN | Division Production Nucléaire | In French | → Nuclear technology |
| DPP | Division Particuliers et Professionnels | In French | → Trade → Electrical engineering |
| DPTH | Division Productions Thermiques et Hydrauliques | In French | → Energy economics → Electrical engineering |
| DRO | Dielectric Resonator Oscillator | In English | → Physics → Electrical engineering |
| DSEA | Data Storage Electronics Assembly | In English | → Data → Electronics |
| DSIN | Direction de la Sûreté des Installations Nucléaires | In French | → Nuclear technology |
| DSP | Digital Signal Processor | In English | → Electronics |
| DTC | Direct Torque Control | In English | → Electrical engineering |
| DTC | Division Téléconduite des Réseaux | In French | → Energy economics → Electrical engineering |
| DUT | Device Under Test | In English | → Electronics |
| DVM | Digital Voltmeter | In English | → Electrical engineering |
| DWR | Druckwasserreaktor = PWR | Pressurized Water Reactor | In English = REP | Réacteur à Eau Pressurisée | In French |
In German | → Nuclear technology |
| E&DSG | Electro-Optical and Data Systems Group | In English | → Data → Electrical engineering |
| E&E | Elektromashinostroenie i Elektrooborudovanie | In Russian | → Serial publications, periodicals |
| E&M | Elektrotechnik und Maschinenbau | In German | → Serial publications, periodicals |
| E&M | Electrical and Mechanical | In English | → Electrical engineering |
| EA | Electronics Assembly | In English | → Electronics |
| EACEM | European Association of Consumer Electronics Manufacturers | In English | → Associations → Electronics |
| EAI | Electronics Associates, Incorporated | In English | → Electronics |
| EAM | Electrical Accounting Machine | In English | → Electrical engineering |
| EANA | Energia Atomikoaren Nazioarteko Agentzia (www.iaea.org) = IAAE | Internacia Agentejo pri Atom-Energio | In Esperanto = 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 |
In Basque | → International relations → Energy economics → Nuclear technology |
| EAS | Engine Actuation System | In English | |
| EASA | Electricidad Argentina SA | In Spanish | → Electrical engineering |
| EC | Engine Control | In English | → Vehicle engineering |
| EC | Engine Cutoff | In English | → Vehicle engineering |
| ECA | Electronic Control Assembly | In English | → Electronics |
| ECA | Electronic Computer Assembly | In English | → Computer science → Electronics |
| ECCAP | Electromagnetic Compatibility Circuit Analysis Program | In English | → Electronics |
| ECCAP | Electromagnetic Compatibility Computer Analysis Proposal | In English | → Computer science → Electronics |
| ECI | European Copper Institute | In English | → Electrical engineering → Metallurgy |
| ECK | Elektrociepłownia Kraków | In Polish | → Electrical engineering |
| ECL | Electronic Circuit Logic | In English | → Computer science → Electronics |
| ECLRv | Electrical Communication Laboratories Review | In English | → Serial publications, periodicals → Electrical engineering → Telecommunications |
| ECQAC | Electronic Components Quality Assurance Committee | In English | → Organizations and associations → Quality management → Electronics |
| ECS | Electrical Control Station | In English | → Electrical engineering |
| ECTEL | European Telecommunications and Professional Electronics Industry | In English | → Electronics → Telecommunications |
| ECU | Electrical Conversion Unit | In English | → Electrical engineering |
| ECU | Electronic Coupling Unit | In English | → Electronics |
| ECU | Electrical Control Unit | In English | → Electrical engineering |
| ECURIE | European Community Urgent Radiological Information Exchange | In English | → Nuclear technology |
| ECW | Elektrociepłownie Wybrzeże SA (www.ecwybrzeze.pl) | In Polish | → Electrical engineering |
| EDA | Electronic Display Assembly | In English | → Human-computer interaction → Electronics |
| EDCS | Electrical Distribution and Control System | In English | → Electrical engineering |
| EDDL | Electronic Device Description Language | In English | → Computer architecture → Hardware → Electronics |
| EDE | Elementos Decorativos Eléctricos (www.e-d-e.com) | In Spanish | → Electrical engineering |
| EDENOR | Empresa Distribuidora y Comercializadora Norte (www.edenor.com.ar) | In Spanish | → Electrical engineering |
| EDF | Électricité de France (www.edf.fr) | In French | → Energy economics → Electrical engineering |
| EDF-T | Électricité de France-Trading | In French | → Finance → Electrical engineering |
| EDFI | Électricité de France International | In French | → Electrical engineering |
| EDM | Electrical Discharge Machining | In English | → Electrical engineering |
| EDM | Études et Développement Mécaniques | In French | |
| EDM | Énergie du Mali | In French | → Energy economics → Electrical engineering |
| EDP | Energias de Portugal | In Portuguese | → Energy economics → Electrical engineering |
| EDP | Electricidade de Portugal | In Portuguese | → Electrical engineering |
| EDS | Electrical Distribution System | In English | → Electrical engineering |
| EE | Electrical Engineering | In English | → Electrical engineering |
| EEA | Électronique, Électrotechnique, Automatique | In French | → Electrical engineering → Electronics |
| EECA | European Electronic Component Manufacturers Association | In English | → Associations → Electronics |
| EEE | Electronic, Electrical, and Electromechanical | In English | → Electrical engineering → Electronics |
| EEEU | End Effector Electronics Unit | In English | → Electronics |
| EEI | Edison Electrical Institute (www.eei.org) | In English | → Organizations and associations → Electrical engineering |
| EEL | Electrical Equipment List | In English | → Electrical engineering |
| EEP | Electronic Equipment Package | In English | → Electronics |
| EEPCA | European Electrical Products Certification Association | In English | → Associations → Electrical engineering |
| eERG | End-use Efficiency Research Group | In English | → Energy economics |
| EES | Electronic Switching System(s) | In English | → Electronics |
| EETB | Electronic/Electrical Termination Building | In English | → Electrical engineering → Electronics |
| EFDA | European Fusion Development Association (www.efda.org) | In English | → Associations → 53912 → Nuclear technology |
| EFESE | Économie, Fonctionnement et Études des Systèmes Énergétiques | In French | → Energy economics → Electrical engineering |
| EFF | Electronic Frontier Foundation | In English | → Foundations → Electronics |
| EFFI | Electronic Frontier Finland | In English | → Organizations and associations → Electronics |
| EGIL | Electrical, General Instrumentation, and Lighting | In English | → Electrical engineering |
| EGSE | Electrical Ground Support Equipment | In English | → Electrical engineering |
| EHA | Electrohydraulic Actuator | In English | → Electrical engineering |
| EHP | Electrical Horsepower | In English | → Electrical engineering |
| EHP | Effective Horsepower | In English | |
| EI | Electronics Interface | In English | → Electronics |
| EIA | Electrical Industries Association (www.eia.org) | In English | → Associations → Electrical engineering |
| EIE | Équipements et Installations Électriques | In French | → Electrical engineering |
| EIfER | European Institute for Energy Research (www.eifer.uni-karlsruhe.de) | In English | → Research institutes → Energy economics → Electrical engineering |
| EIS | Electrical Integration System | In English | → Electrical engineering |
| EIVT | Electrical Interface Verification Test | In English | → Electrical engineering |
| EIVT | Electronic Installation Verification Test | In English | → Electronics |
| EIVT | Electrical and Instrumentation Verification Test | In English | → Electrical engineering |
| ElBah | Elektrische Bahnen | In German | → Serial publications, periodicals → Electrical engineering → Vehicle engineering |
| ELC | European Lighting Council | In English | → Organizations and associations → Electrical engineering → Environmental technology, water supply, waste management |
| ELCIDIS | ELectric CIty DIstribution System | In English | → Electrical engineering → Vehicle engineering |
| ELINT | Electronic Intelligence Satellite | In English | → Electronics → Spaceflight engineering, astronautics |
| ElL | Electronics Letters | In English | → Serial publications, periodicals → Electronics |
| ElLC | Electrotechnical Laboratory Circulars | In English | → Serial publications, periodicals → Electrical engineering |
| ElLR | Electrotechnical Laboratory Researches | In English | → Serial publications, periodicals → Electrical engineering |
| ElMod | Электронное моделирование = ElMod | Elektronnoe Modelirovanie | In Russian |
In Russian | → Serial publications, periodicals → Electrical engineering |
| ElMod | Elektronnoe Modelirovanie = (look above) |
In Russian | → Serial publications, periodicals → Electrical engineering |
| ElP | Electronics Power | In English | → Serial publications, periodicals → Electronics |
| ElPro | Electronic Progress | In English | → Serial publications, periodicals → Electronics |
| ELSECOM | European Electrotechnical Sectoral Committee for Testing and Certification | In English | → Organizations and associations → Quality management → Electrical engineering |
| ElTA | Elektronnaia Tekhnika Avtomatike | In Russian | → Serial publications, periodicals |
|