| Abbreviation | Definition |
|---|---|
| ETF | Employment and Training Fund |
| ETFE | Ethylene Tetra Flouroethylene |
| ETG | Enhanced Target Generator |
| ETH | Ecdysis Triggering Hormone |
| ETI | Environmental Technology Initiative |
| ETM | Etiotropic Trauma Management |
| ETM | Early Teen Ministry |
| ETM | Enhanced Thematic Mapper |
| ETMS | Enhanced Traffic Management System |
| ETN | Electronic Telecommunications Network |
| ETOH | Ethyl Alcohol (Ethanol) |
| ETOP | Environmental Technology Opportunities Portal |
| ETP | Effluent Treatment Plan |
| ETPS | Electro Therapeutic Point Stimulation |
| ETRAN | Monte Carlo computer code for Electrons and Photons through Extended Media |
| ETROD | Eastern Test Range Operations Directive |
| ETRS | European Terrestrial Reference System |
| ETS | Electronic Total Stations |
| ETS | Endoscopic Thoracic Sympathectomy |
| ETS | Environmental Tobacco Smoke |
| ETS | Emission Trading Scheme |
| ETS | Electrical Test Set |
| ETS | Energy Transfer System |
| ETS | External Tank System |
| ETSI | European Telecommunications Standards Institute |
| ETSS | External Tank Separation Subsystem |
| ETT | Elementary Teachers Training |
| ETT | Endotracheal tube |
| ETT | Exercise tolerance test |
| ETT | Exercise Treadmill Test |
| ETT | Emphysema Treatment Trial |
| ETTDC | Electronics Trade and Technology Development Development Corporation |
| ETVA | External Tank Vent Arm |
| ETW | Event Tracing For Windows |
| EU | European Union |
| EU | Europium |
| EU | Experience Unlimited |
| EU | Engineering Unit |
| EU | Electronic Unit |
| EU | Experimental Unit |
| EUA | Examination Under Anesthetic |
| EUAC | European Union of Aquarium Curators |
| EUCC | European Union for Coastal Conservation |
| EUFOR | European Union Force |
| EULA | End User License Agreement |
| EUMETSAT | European Meterological Satellite Organisation |
| EUMI | Environmental Urban Management Initiative |
| EUP | Environmental Use Permit |
| EUP | Enterprise Unified Process |
| EUPR | European Union of Public Relations |