| Abbreviation | Definition |
|---|---|
| RLU | Red Loop Unit |
| RLUG | Reno Linux Users Group |
| RLUG | Romanian Linux Users Group |
| RM | Raden Mas |
| RMA | Right Mouse Action |
| RMB | Read Memory Barrier |
| RMC | Rational Method Composer |
| RMCP | Remote Music Control Protocol |
| RMF | Radio Mobile Freeware |
| RMN | Nuclear Magnetic Resonance data processing program |
| RMR | Read in Microsoft Reader |
| RMR | RenderMan Repository |
| RMS | Rental Management Software |
| RMS | Resource Monitoring System |
| RNA | Restful Notification Architecture |
| RNC | Real Nice Compressor |
| ROC | Restore Old Colors |
| RODA | Registry of Open Data on AWS |
| ROES | Remote Order Entry Software |
| ROID | Registry Object IDentification |