| Acronym | Meaning |
 | EHF | Extremely High Frequency |
| EHR | Equipment History Record |
| EI | Exbi |
| EI | Ireland (FIPS 10-4 Country Code; From ire) |
| EIA | Environmental Impact Assessment |
| EIAH | Encyclopedia Of Iranian Architectural History |
| EIAH | Environnements Informatiques Pour L'Apprentissage Humain |
| EIC | East India Company |
| EICS | East India Company's Service |
| EID | Electronic ID |
| EIRP | Effective Isotropic Radiated Power |
| EIS | Environmental Impact Statement |
| EJ | Exajoule |
| EK | Equatorial Guinea (FIPS 10-4 Country Code) - Exakelvin |
| EKG | Electrocardiogram (from German Elektrokardiogramm) |
| EKMS | Electronic Key Management System |
| EL | Exalitre |
| EL | Greek Language (ISO 639-1 Code) |
| ELF | Earth Liberation Front - Endangered Language Fund - Eritrean Liberation Front - Executable And Linkable Format - Extremely Low Frequency |
| ELINT | Electronic Intelligence |
| ELL | Greek Language (ISO 639-2 Code) |
| ELM | Edge-Localised Mode (plasma Physics) |
| ELP | Emerson Lake And Palmer |
| ELSS | Emergency Life Support Stores |
| ELT | Emergency Locator Transmitter |
| EM | ElectroMagnetism/ElectroMagnetic |
| EM | Exametre |
| EMA | European Medicines Agency |
| EMC | Electric Membership Corporation - Electromagnetic Compatibility - Electro-Motive Corporation - European Muon Collaboration - Evergreen Marine Corporation |
| EMCON | (Electromagnetic) Emissions Control |
| EMD | Electro-Motive Diesel - Engineering And Manufacturing Development - European Missile Defence |
| EMDG | Euro-Missile Dynamics Group |
| EMDR | Eye Movement Desensitisation And Reprocessing |
| EMEA | Europe |
| EMF | Electromotive Force |
| EMG | ElectroMyoGraph |
| EMO | Emergency Measures Organisation-Emotional |
| EMP | ElectroMagnetic Pulse |
| EMS | Emergency Medical Services |
| EMT | Emergency Medical Technician |
| EMU | Electric Multiple Unit - A Method Of Connecting Self-propelled Railway Vehicles Together To Form A Train Under The Control Of One Driver. |
| EN | Corps Of Engineers -Estonia (FIPS 10-4 Country Code) - Exanewton |
| EN | English Language (ISO 639-1 Code) |
| ENE | East North-East |
| ENG | English Language (ISO 639-2 Code) |
| ENSATT | cole Nationale Sup?rieure Des Arts Et Techniques De Th?Ÿtre (French |
| ENT | Ear |
| ENTEC | Euro NATO Training Engineer Centre |
| ENVL | Envelope |
| ENY | Enemy |
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