| RTLS | | Real-time Location system |
| RTLW | | rangers lead the way |
| RTMF | | read the manual first |
| RTMP | | Routing Table Maintenance Protocol |
| RTOK | | Retest-Ok |
| RTOK/CND | | Retest-Ok/Can-Not-Duplicate |
| RTOL | | real-time on line |
| RTOS | | realtime Operating system |
| rtpma | | read the previous message again |
| rtr | | ready to roll |
| RTS | | Read the screen |
| RTS | | Ready to Send |
| RTS | | Real Time Strategy |
| RTSM | | Read The Silly Manual |
| RTSM | | Read The Stupid Manual |
| RTT | | round trip time |
| RTTSD | | Right Thing To Say Dude |
| RTTTL | | ring tones text transfer language |
| RTV | | Return to Vendor |
| RTW | | ready to wear |
| RTW | | ready-to-wear |
| RTW | | Return To Work |
| RTW | | round the world |
| rtwt | | Read The Whole Thing |
| RUC | | Rapid Update Cycle |
| RUC | | Road User Charge |
| ruflmao | | rolling under the floor laughing my ass off |
| RUIM | | removable user identiy module |
| RUP | | Restricted Use Pesticide |
| ruv | | recreational utility vehicle |
|