| Acronym | Definition |
|---|
| ETU | Electrical Trades Union |
| ETU | European Taekwondo Union |
| ETU | Ebola Treatment Unit |
| ETU | Expect the Unexpected (movie) |
| ETU | European Trade Union |
| ETU | Engine Tune Up |
| ETU | Saint Petersburg Electrotechnical University (Russia) |
| ETU | Easy to Understand |
| ETU | Easy to Use |
| ETU | Ethylene Thiourea (pesticide & fungicide) |
| ETU | Engineering Test Unit |
| ETU | Embrace the Unknown (band) |
| ETU | Educational Technology Unit |
| ETU | Environmental Test Unit |
| ETU | Economics and Trade Unit (UN Environment Programme) |
| ETU | Elementary Time Unit (SIM card timing unit) |
| ETU | Ethernet Termination Unit |
| ETU | Early Training Unit |
| ETU | Estimated Time to Be Up |
| ETU | Emergency Task Unit (various locations) |
| ETU | Emergency Tactical Unit |
| ETU | Estimated Time of Upgrade |
| ETU | Expeditionary Training Unit |
| ETU | Express Treatment Unit (medical) |
| ETU | Evidence Techinical Unit |