| Acronym | Definition |
|---|
| ETO | Ethylene Oxide |
| ETO | European Theater Of Operations |
| ETO | Engineer-To-Order |
| ETo | Evapotranspiration |
| ETO | Etoposide |
| ETO | Efforts to Outcomes (Social Solutions software/services) |
| ETO | Endorsed Training Organisation |
| ETO | Earth To Orbit |
| ETO | Early Termination Option |
| ETO | Economic, Technical or Organisational (employment law; UK) |
| ETO | Earned Time Off |
| ETO | European Telecommunications Office |
| ETO | Engineering-To-Order |
| ETO | Electronic Trading Opportunities |
| ETO | Exchange Traded Option (finance) |
| ETO | Electronics Technology Office (DARPA) |
| ETO | Extended Terminal Option (IBM - IMS software) |
| ETO | Energy Trust of Oregon, Inc (Portland, OR) |
| ETO | Effects Tasking Order |
| ETO | Estimated Take-Off |
| ETO | Ergenekon Terör Örgütü (Turkish: Ergenekon Terror Organization) |
| ETO | Earth Traverse Outfitters (Knoxville, TN) |
| ETO | Extended Trochanteric Osteotomy (surgical operation) |
| ETO | Eustachian Tube Obstruction |
| ETO | Estimated Time of Overflight (air traffic management) |
| ETO | Enterprise Technology Organization |
| ETO | Excise & Taxation Officer (Pakistan) |
| ETO | Emergency Treatment Order |
| ETO | Equity Take Out (mortgages) |
| ETO | Extended Time Observation |
| ETO | Electrical Technical Officer (engineering) |
| ETO | Engineering Technology Office |
| ETO | Electrical-Thermal-Optical |
| ETO | Expeditionary Theater Opening (US Department of Defense) |
| ETO | Estimated Time in Operation (aviation) |
| ETO | Extended Technical Objective |
| ETO | Expiration Term of Obligation |
| ETO | Express Transportation Order |
| ETO | Evasion Tactics Order |
| ETO | Elite Tactical Operations (gaming clan) |
| ETO | English Touring Opera (UK) |