| RTU | Radio Terminal Unit 
| Others |
| RTU | Radiological Technologies University
| Others |
| RTU | Rai Technology University
| Others |
| RTU | Rajasthan Technical University
| Others |
| RTU | Rambo Trade Unit
| Others |
| RTU | Reaching the Unreached
| Others |
| RTU | Ready To Use
| Others |
| RTU | Real Tamale United
| Others |
| RTU | Real time updates
| Others |
| RTU | Real- Time Unit
| Others |
| RTU | Receiving Transfer Unit
| Others |
| RTU | Regional Training Unit
| Others |
| RTU | Reinbeck Telecommunications Utility
| Others |
| RTU | Remote Telemetry Unit
| Others |
| RTU | Remote Telemetry Units
| Others |
| RTU | Remote Terminal Unit
| Others |
| RTU | Remote Terminal Units
| Others |
| RTU | Remote Test Unit
| Others |
| RTU | Remote Transmitter Unit
| Others |
| RTU | Remote Trunking Unit
| Others |
| RTU | Replacement Training Unit
| Others |
| RTU | Residential Treatment Unit
| Others |
| RTU | Return terminal unit
| Others |
| RTU | Return To User
| Others |
| RTU | Returned To Unit
| Others |
| RTU | Revolutionary Technologies United
| Others |
| RTU | Riga Technical University
| Others |
| RTU | Right To Use
| Others |
| RTU | Rizal Technological University
| Others |
| RTU | Roof Top Unit
| Others |
| RTU | Route Table Update
| Others |
| RTU | Rule Template Unit
| Others |