| EnFM | Engineering Fracture Mechanics | In English | → Serial publications, periodicals → 531 → Engineering, technology |
| ENG | Electronystagnogram | In English | → Diagnostics |
| EngAn | Engineering Analysis | In English | → Serial publications, periodicals → Engineering, technology |
| EngCo | Engineering Computations | In English | → Serial publications, periodicals → Computer science → Engineering, technology |
| ENIAC | European Nanoelectronics Initiative Advisory Council (www.eniac.eu) | In English | → Organizations and associations → 62128 |
| ENIAR | European Network for Indigenous Australian Rights | In English | → Organizations and associations → Migrations |
| ENNDA | Ewaso Ng'iro North Development Authority | In English | → Development |
| ENNNRCP | Ewaso Ng'iro North Natural Resources Conservation Project | In English | → Nature and society |
| ENOB | Effective Number of Bits | In English | → Computer science → Electronics |
| EnOp | Engineering Optimization | In English | → Serial publications, periodicals → Engineering, technology |
| ENQA | European Association for Quality Assurance in Higher Education (www.enqa.eu) | In English | → Associations → Higher education, universities |
| ENS | European Nervous System | In English | |
| EnS | Energy Sources | In English | → Serial publications, periodicals → Energy economics |
| ENS-CC | ENS (European Nervous System) Certification Center | In English | |
| ENSO | El Niño - Southern Oscillation | In English | → Meteorology, climatology |
| EnST | Environmental Science Technology | In English | → Serial publications, periodicals → Engineering, technology → Environment, environmental sciences |
| ENTA | European Nanotechnology Trade Alliance | In English | |
| ENTO | Employment National Training Organisation | In English | → Organizations and associations → Labour, labour economics → Education |
| EnTox | Environmental Toxicology | In English | → Serial publications, periodicals → Environment, environmental sciences |
| EnTR | Energy Technology Review | In English | → Serial publications, periodicals → Energy economics |
| ENUM | Electronic NUmber Mapping | In English | → Networks, communication |
| ENUM | Electronic Numbering Protocol | In English | → Telecommunications |
| Env | Environmentrics | In English | → Serial publications, periodicals → Engineering, technology → Environment, environmental sciences |
| ENVISAT | Environmental Satellite | In English | → Environment, environmental sciences → Spaceflight engineering, astronautics |
| ENVS | Edge Network Video Servers | In English | → Telecommunications |
| EO | Exchange Online | In English | → 659 |
| EO | Europe Online | In English | |
| EO | Entrepreneurs’ Organization | In English | → Organizations and associations → Economic policy |
| EOAAE | Equal-Opportunity Affirmative-Action Employer | In English | → Labour, labour economics |
| EOAS | Engineering Order Accountability System | In English | |
| EOAST | Earth-Oriented Applications and Space Technology | In English | → Serial publications, periodicals → Earth sciences → Spaceflight engineering, astronautics |
| EOC | Earth Observation Center | In English | → Earth sciences |
| EOC | Engine-Out Capability | In English | → Vehicle engineering |
| EOC | Engine Order Capability | In English | → Vehicle engineering |
| EOC | End Of Contract | In English | → 3474 |
| EOC | Electro-Optical Center | In English | |
| EOC | Edge Of Coverage | In English | |
| EOC | Early Operational Capability | In English | |
| EOCM | Electro-Optical Countermeasure | In English | |
| EOCR | Engineering Order Control Record | In English | → Engineering, technology |
| EOD | Explosive Ordnance Disposal | In English | |
| EODB | End Of Data Block | In English | → Data |
| EODC | Earth Observation Data Centre | In English | → Earth sciences |
| EODM | EMF Ontology Definition Metamode | In English | → Programming languages → Data → Linguistics |
| EODRS | Earth Observation Data Retrieval System | In English | → Earth sciences → Spaceflight engineering, astronautics |
| EOF | End Of File | In English | → Computer science |
| EOG | Electroculogram | In English | → Diagnostics |
| EOHT | External Oxygen and Hydrogen Tank | In English | → Spaceflight engineering, astronautics |
| EOI | Earth Orbit Insertion | In English | → Spaceflight engineering, astronautics |
| EOL | End Of Line | In English | → Computer science |
| EOL | Earth Orbit Launch | In English | → Spaceflight engineering, astronautics |
| EOM | Engineering Operations Manual | In English | → Engineering, technology |
| EOM | Earth Orbital Mission | In English | → Spaceflight engineering, astronautics |
| EOM | Equation Of Motion | In English | → Physics → Mechanical engineering |
| EONS | European Oncology Nursing Society | In English | → Organizations and associations → Oncology |
| EONS | Enhanced Operator Name String | In English | → Telecommunications |
| EOO | European OpenID Organization | In English | → Organizations and associations |
| EOP | Earth and Ocean Physics | In English | → Geophysics → Marine research, oceanography |
| EOP | Emergency Oxygen Pack | In English | |
| EOPAP | EArth and Ocean Physics Application Program | In English | → Geophysics → Marine research, oceanography |
| EOPF | End of Powered Flight | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| EOPR | Engineering Order Purchase Requisition | In English | → 34745 |
| EOPR | Engineering Order Purchase Request | In English | → 34745 |
| EOQ | Economic Order Quantity | In English | |
| EORQ | Engineering Order Request For Quotation | In English | |
| EORSAT | Electronic Ocean Reconstruction Satellite | In English | → Marine research, oceanography → Spaceflight engineering, astronautics |
| EORTC | European Organisation for Research and Treatment of Cancer | In English | → Organizations and associations → Oncology |
| EOS | Electrophoretic Separation | In English | |
| EOS | Earth-Orbit Shuttle | In English | → Spaceflight engineering, astronautics |
| EOS | Extended Operating System | In English | → Computer science |
| EOS | Earth Observation Satellite | In English | → Spaceflight engineering, astronautics |
| EOS | Emergency Oxygen System | In English | |
| EOS | Egyptian Organization for Standardization and Quality | In English | → Standardization |
| EOS | Egyptian Organization for Standardization and Quality Control | In English | → Standardization |
| EOS | Earth Observing System | In English | → Earth sciences |
| EOSD | Electro-Optical Systems Design | In English | → Serial publications, periodicals → Electrical engineering |
| EOSH | Electro-Optical Sensor Hardening | In English | |
| EOSP | Earth Observing Scanning Polarimeter | In English | |
| EOSS | Extravehicular Activity Operational Slide-Wire System | In English | → Spaceflight engineering, astronautics |
| EOSS | Earth-Orbital Space Station | In English | → Spaceflight engineering, astronautics |
| EOT | End Of Tape | In English | |
| EOT | End Of Transmission | In English | |
| EOTA | European Organization for Technical Approvals | In English | → Standardization |
| EOTA | European Organisation for Technical Approvals | In English | → Standardization |
| EOTC | European Organization for Testing and Certification | In English | → Organizations and associations → Standardization |
| EOTC | European Organisation for Testing and Certification | In English | |
| EOTD | Enhanced Observed Time Difference | In English | → Telecommunications |
| EOTF | Engineering Order To Follow | In English | |
| EOTS | Electro-Optical Threat Sensor | In English | |
| EOW | Energy Over Weight | In English | |
| EP | Experiment Planning | In English | → Research policy |
| EP | Electrical Power | In English | → Electrical engineering |
| EP | Elbow Pitch | In English | |
| EP | European Parliament (www.europarl.europa.eu) = PE | Parlamento Europeo | In Spanish = EP | Eŭropa Parlamento | In Esperanto = EP | Europäisches Parlament | In German = ΕΚ | Ευρωπαϊκό Κοινοβούλιο | In Greek = EP | Evropský parlament | In Czech = PE | Parlament Europeu | In Catalan = ЕП | Европейски парламент | In Bulgarian = AP | Avropa Parlamenti | In Azerbaijani = PE | Parlement Européen | In French = EP | Europäescht Parlament | In Letzeburgesh = PE | Parlamento Europeo | In Italian = EP | Európai Parlament | In Hungarian = EP | Európsky parlament | In Slovak = PE | Parlamentul European | In Romanian = PE | Parlamento Europeu | In Portuguese = PE | Parlament Europejski | In Polish = EP | Europees Parlement | In Dutch |
In English | → Parliaments, representation → European Union |
| EP&S | Earth, Planets, and Space | In English | → Serial publications, periodicals → Solar system |
| EPA | Estimated Plan Of Action | In English | → Management |
| EPA | Engineering Personnel Authorization | In English | → Engineering, technology |
| EPA | Engineering Project Authorization | In English | → Engineering, technology |
| EPA | Environmental Protection Agency | In English | → Public administration, government → Nature → Environment, environmental sciences |
| EPAN | European Public Administration Network | In English | → Public administration, government |
| EPC | External Power Contractor | In English | → Electrical engineering |
| EPC | Error Protection Code | In English | |
| EPC | Electronic Parts Control | In English | → Electronics |
| EPC | European Patent Convention = CBE | Convention sur le Brevet Européen | In French = EPU | Europäisches Patentübereinkommen | In German = CPE | Convenio sobre la Patente Europea | In Spanish = EOV | Europees Octrooiverdrag | In Dutch |
In English | → International economic cooperation → Industrial property |
| EPC | Electronic Product Code | In English | → Electronics |
| EPCDC | Electrical Power Conditioning, Distribution, and Control | In English | → Electrical engineering |
| EPCR | Endothelial Protein C Receptor | In English | → Biochemistry, biophysics |
| EPCReN | Eurasia Political Culture Research Network | In English | → Politics |
| EPD | Energetic Particles Detector | In English | → Astronomy |
| EPD | Emergency Procedures Document | In English | |
| EPD | Electrical Power Distribution | In English | → Electrical engineering |
| EPDB | Experiment Power Distribution Box | In English | → Electrical engineering |
| EPDC | Electrical Power Distribution and Control | In English | → Electrical engineering |
| EPDCS | Electrical Power Distribution and Control Subsystem | In English | → Electrical engineering |
| EPDM | Ethylene Propylene Diene Monomer | In English | → Chemical technology → Plastic industry |
| EPDS | Electrical Power Distribution System | In English | → Electrical engineering |
| EPDU | Electrical Power Distribution Unit | In English | → Electrical engineering |
| EPEM | European Producers of Electrofused Minerals | In English | → Organizations and associations → Metallurgy |
| EPER | European Pollutant Emission Register | In English | → 503 |
| EPF | European Psychoanalytical Federation (www.epf-eu.org) = FEP | Fédération Européenne de Psychanalyse | In French = EPF | Europäische Psychoanalytische Föderation | In German |
In English | → Organizations and associations → Psychology |
| EPF | European Property Federation | In English | → Organizations and associations → 3328" |
| EPF | The Equine Preservation Foundation | In English | → Foundations → Agricultural sciences |
| EPFA | European Plasma Fractionation Association | In English | → Associations → Pharmacology, toxicology |
| EPG | Electrical Power Generator | In English | → Electrical engineering |
| EPG | Entertainment Program Guide | In English | |
| EPGCS | Electrical Power Generation and Control Subsystem | In English | → Electrical engineering |
| EPGS | Electrical Power Generation Subsystem | In English | → Electrical engineering |
| EPHOS | European Procurement Handbook for Open Systems | In English | → Computer science |
| EPHTA | Ecoregional Programme for Humid and Subhumid Tropics of Subsaharan Africa | In English | |
| EPIA | European Photovoltaic Industry Association | In English | → Associations → Energy economics → Electrical engineering |
| EPIC | European Project on Information Infrastructure Co-ordination Group | In English | → Telecommunications |
| EPICA | European Project for Ice Coring in Antartica | In English | → Earth sciences |
| EPIISG | European Project on Information Infrastructure Starter Group | In English | → Telecommunications |
| EPIRSS | Extended-Performance Infrared Search Set | In English | |
| EPJ | European Physical Journal | In English | → Serial publications, periodicals → Physics |
| EPJAP | European Physical Journal - Applied Physics | In English | → Serial publications, periodicals → Physics |
| EPL | Expected Power Level | In English | |
| EPL | Electronic, Electrical, and Electromechanical Parts List | In English | → Electrical engineering |
| EPL | Electrical Power Level | In English | → Electrical engineering |
| EPL | Emergency Power Level | In English | |
| EPLA | European Patent Litigation Agreement | In English | → International economic cooperation → Industrial property |
| EPLD | Electrically Erasable Programmable Logic Device | In English | → Hardware → Electronics |
| EPLS | European Pediatric Life Support | In English | → Pediatry |
| EPM | Engineering Project Manager | In English | → Engineering, technology |
| EPMS | Engineering Performance Management System | In English | → Engineering, technology |
| EPNS | European Paediatric Neurology Society (www.epns.info) | In English | → Organizations and associations → Neurology → Pediatry |
| EPO | European Patent Office (www.epo.org) = OEP | Oficina Europea de Patentes | In Spanish = OEB | Office Européen des Brevets | In French = EOB | Europees Octrooibureau | In Dutch = IEP | Instituto Europeu de Patentes | In Portuguese = EAP | Europäisches Patentamt | In German |
In English | → International economic cooperation → Industrial property |
| EPO | European Patent Organisation = EPO | Europäische Patentorganisation | In German = ΕΟΔΕ | Ευρωπαϊκός Οργανισμός Διπλωμάτων Ευρεσιτεχνίας | In Greek |
In English | → International economic cooperation → Industrial property |
| EPO | Emergency Planning Officer | In English | |
| EPO | Element Project Office | In English | |
| EPOC | External Payload Operations Center | In English | → Spaceflight engineering, astronautics |
| EPOSS | European Technology Platform on Smart Systems Integration (www.smart-systems-integration.org) | In English | → Organizations and associations → Electronics |
| EPP | European Passive Plant | In English | → Nuclear technology |
| EPPC | European Paleobotany-Palynology Conference | In English | → Congresses → Paleobotany, palynology |
| EPPSS | Electrical Power/Pyro Sequential System | In English | → Electrical engineering |
| EPR | Engine Pressure Ratio | In English | → Engineering, technology |
| EPR | Engineering Purchase Request | In English | → 34745 → Engineering, technology |
| EPR | European Pressurized Reactor | In English | → Nuclear technology |
| EPRI | Electric Power Research Institute (www.epri.com) | In English | → Research institutes → Electrical engineering |
| EPRN | Emergency Program Release Notice | In English | |
| EPROM | Erasable Programmable Read-Only Memory | In English | → Memories |
| EPS | Electrical Power System | In English | → Electrical engineering |
| EPS | Experimental Power Supply | In English | → Electrical engineering |
| EPS | Emergency Power System | In English | → Electrical engineering |
| EPS | Europe Pacific Solidarity | In English | → International relations |
| EPS | European Polar System | In English | → Earth sciences |
| EPSMA | European Power Supply Manufacturers Association | In English | → Organizations and associations → Energy economics → Electrical engineering |
| EPSN | European Passive Safety Netwok | In English | → Transport and postal services |
| EPSP | Experiment Power Switching Panel | In English | → Electrical engineering |
| EPSRC | Engineering and Physical Sciences Research Council | In English | → Physics → Engineering, technology |
| EPSS | Electronic Proposal Submission Service | In English | → Research policy → European Union |
| EPSS | Electronic Proposal Submission System | In English | → Networks, communication |
| EPSTF | Electrical Power System Test Facility | In English | → Electrical engineering |
| EPSU | European Public Service Union | In English | → Organizations and associations → Labour, labour economics → Public administration, government |
| EPT | Emergency Procedure Trainer | In English | |
| EPT | External Pipe Thread | In English | |
| EPT | Ethylene Propylene Terpolymer | In English | → Chemical technology |
| EPT | Environmental Proof Test | In English | |
| EPTA | European Power Tool Association | In English | → Organizations and associations → Energy economics |
| EPTU | Events Per Time Unit | In English | |
| EPU | European University Center for Peace Studies | In English | |
| EPW | Economic and Political Weekly | In English | → Serial publications, periodicals → Politics → Economics |
| EPWG | Experiment Planning Working Group | In English | |
| EPWG | Environmental Projects Working Group | In English | |
| EPY | Electronic Control Assembly Pitch And Yaw | In English | → Electronics |
| EPZA | Export Processing Zones Authority | In English | → Trade |
| EQ | Education Queensland | In English | → Education |
| EQ | Emotional (Intelligence) Quotient | In English | → Psychology |
| EQE | Event Queue Element | In English | |
| ER | Endosplasmic Reticulum | In English | |
| ER | Established Reliability | In English | |
| ER | Explanation Report | In English | |
| ER | Extended Reliability | In English | |
| ER | Entity Resolution | In English | → Writing systems → Data |
| ERA | Element-Relationship-Attribute | In English | |
| ERA | Electrical Replaceable Assembly | In English | → Electrical engineering |
| ERA | Engineering Research Associates | In English | |
| ERA | European Ramblers Association (www.era-ewv-ferp.org) = EWV | Europäische Wandervereinigung | In French = FERP | Fédération Européenne de Randonnée Pédestre | In French |
In English | → Associations → Sport, physical exercises |
| ERAC | European Rail Research Advisory Council | In English | → Organizations and associations → Rail transport engineering → Transport and postal services |
| ERAD | Endoplasmic reticulum-associated degradation | In English | → Cytology → Medicine |
|