| Abbreviation | Definition |
|---|---|
| RTSP | Real-time Streaming Protocol |
| RTT | Resent Timeout Time |
| RTT | Round Trip Time |
| RTTTL | Ring Tones Text Transfer Language |
| RTU | Return To User |
| rTWI | rTorrent Web Interface |
| RUDE | Realtime UDP Data Emitter |
| RUDP | Reliable User Datagram Protocol |
| RUG | Resource Usage Group |
| RUI | Reflected User Interface |
| RUM | Remote User Multiplex |
| RVP | Rendezvous Protocol |
| RWA | Routing and Wavelength Assignment |
| RWC | Remote Web Console |
| RWIN | Receive WINdow |
| RWN | Regional Wireless Network |
| RWN | Restricted Word Network |
| RWN | Rockstar Wireless Networking |
| RWP | Remote Write Protocol |
| RWPCP | Read/Write Priority Ceiling Protocol |