| Acronym | Definition |
|---|
| ECSU | Ethiopian Civil Service University |
| ECSU | Elizabeth City State University (Elizabeth City, NC, USA) |
| ECSU | Eastern Connecticut State University (Willimantic, CT, USA) |
| ECSU | Electronics and Communication Sciences Unit (India) |
| ECSU | Emily Carr Students' Union (Canada) |
| ECSU | Electronic Communications Surveillance Unit (US FBI) |
| ECSU | Erindale College Student Union |
| ECSU | Electronic Crash Sensor Unit |
| ECSU | Emmanuel College Student Union (Cambridge, UK) |
| ECSU | Electrical Certification Support Unit |
| ECSU | Essential CONUS Support Unit |