| Acronym | Definition |
|---|
| REU | Research Experience for Undergraduates |
| REU | Reunion (ISO Country code) |
| REU | Redding Electric Utility (California) |
| REU | Ram Expansion Unit |
| REU | Reservation and Execution Unit |
| REU | Regional Office for Europe |
| REU | Residential Equivalent Unit |
| REU | Research Evaluation Unit (various locations) |
| REU | Renewable Energies Unit (EU) |
| REU | Reus, Spain - Reus (Airport Code) |
| REU | RAID Expansion Unit (hardware description) |
| REU | Radar Electronics Unit (developed by Lockheed Martin) |
| REU | Remote Emitter Unit |
| REU | Radio Electronics Unit |
| REU | Rated Exposure Unit |