| Acronym | Meaning |
 | ET | Estonian Language (ISO 639-1 Code) |
| ET | Ethiopia (ISO 3166 Digram; FIPS 10-4 Country Code) - Exatesla -Extra Terrestrial |
| ET AL. | Et Alii/aliae/alia (Latin |
| ET SEQ. | Et Sequens/sequentes/sequentia (Latin |
| ETA | Estimated Time Of Arrival -Euzkadi Ta Azkatasuna (etta |
| ETB | Ethiopian Birr (ISO 4217 Currency Code) |
| ETC/RMT | Explosive Transient Camera/Rapidly Moving Telescope |
| ETF | Emergency Task Force (a Special Police Unit |
| ETH | Ethiopia (ISO 3166 Trigram) |
| ETI | Extra-Terrestrial Intelligence |
| ETLA | Extended TLA |
| ETM | Enhanced Thematic Mapper |
| ETT | Embedded Training Team |
| EU | Basque Language (ISO 639-1 Code) |
| EU | Europa Island (FIPS 10-4 Country Code) -European Union |
| EU | Europium |
| EUCOM | (U.S.) European Command |
| EULA | End-User License Agreement (you-lah) |
| EUR | Euro (ISO 4217 Currency Code) |
| EUS | Basque Language (ISO 639-2 Code) |
| EV | Exavolt |
| EVA | Extra-Vehicular Activity |
| EW | Electronic Warfare -Exawatt |
| EWE | Ewe Language (ISO 639-2 Code) |
| EWR | Newark Liberty International Airport (IATA Airport Code) |
| EWSD | Elektronisches W?hlsystem Digital (German |
| EXFOR | Experimental Force (military) |
| EXREP | Expeditious Repair (SM&R Code) |
| EZ | Czech Republic (FIPS 10-4 Country Code) -Extraction Zone |
| EZLN | Ej?rcito Zapatista De Liberaci›n Nacional (Spanish |
| F | Farad - Fluorine |
| F | Femto |
| F&SF | (The Magazine Of) Fantasy & Science Fiction |
| F.K.A. OR F/K/A | Formerly Known As |
| F/U/B/O | For The Use And Benefit Of (found In Legal Documents) |
| F/W | Fixed Wing |
| FA | Field Artillery - Financial Aid - Football Association (England) |
| FA | Femtoampere |
| FA | Persian Language (ISO 639-1 Code) |
| FAA | U.S. Federal Aviation Administration - Financial Aid Administrator - Fleet Air Arm - Functional Area Analysis |
| FAAD | Forward Area Air Defence |
| FAADEZ | Forward Area Air Defence Engagement Zone |
| FAAN | Fellow Of The American Academy Of Nursing |
| FAAQ | Frequently Asked And Anticipated Questions (cf. FAQ) |
| FAASV | Field Artillery Ammunition Supply Vehicle |
| FAB | Feline Advisory Bureau (UK Feline Charity) |
| FAC | Forward Air Controller - Front Of Allies For Change - Frontal Affinity Chromatography - Full Aperture Calibrator |
| FACA | (US) Federal Advisory Committee Act |
| FACS | Formal Aspects Of Computing Science - Fluorescent-activated Cell Sorting |
| FACTS | Flexible Alternating Current Transmission System |
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