| Acronym | Definition |
|---|
| ECU | Electronic Control Unit |
| ECU | Engine Control Unit |
| ECU | East Carolina University |
| ECU | Edith Cowan University |
| ECU | Ecuador (ISO Country code) |
| ECU | East Central University (Ada, OK) |
| ECU | European Currency Unit (former monetary unit) |
| ECU | Equality Challenge Unit (UK) |
| ECU | Employees Credit Union (various locations) |
| ECU | Evaporative Cooling Unit (air conditioning) |
| ECU | European Chess Union |
| ECU | Electronically-Controlled Unit (engines) |
| ECU | External Control Unit (various uses) |
| ECU | EISA Configuration Utility |
| ECU | Environmental Control Unit |
| ECU | Extended Care Unit (medical care) |
| ECU | European Chiropractors' Union (est. 1932) |
| ECU | Eurasian Customs Union |
| ECU | Extreme Close Up (film & video) |
| ECU | Extensor Carpi Ulnaris (tendon) |
| ECU | Electrical Control Unit |
| ECU | End Cryptographic Unit |
| ECU | Emergency Care Unit (trauma facility) |
| ECU | Unità di Conto Europea (Italian) |
| ECU | Evidence Control Unit (various locations) |
| ECU | Environmental Crimes Unit (DOE) |
| ECU | Edison Credit Union |
| ECU | Encephalitozoon Cuniculi |
| ECU | Experiment Control Unit (NASA) |
| ECU | Environmental Conditioning Unit |
| ECU | Engineering Concepts Unlimited (manufacturer/designer of engine controls) |
| ECU | Eternal Care Unit (morgue euphemism) |
| ECU | Electrical Conversion Unit |
| ECU | Engine Change Unit |
| ECU | Electro Chemical Unit |
| ECU | Error Correction Unit |
| ECU | Energy Conservation Unit (hot water heat exchanger) |
| ECU | Engineering Concepts Unlimited, Inc (manufacturer/designer of Engine Controls) |
| ECU | English Church Union |
| ECU | Energy Recovery Unit (hot water heat exchanger) |
| ECU | Enhanced Channel Unit (cellular) |
| ECU | Elgin Choral Union (Elgin, IL) |
| ECU | Equivalence Class Unification |
| ECU | Electronic Cabling Unit |
| ECU | End COMSEC Unit |
| ECU | Executive Control Unit |
| ECU | Entertainment Capacity Unit |
| ECU | External Connectivity Utility |