| Abbreveation | | description |
| RLR | | Earlier |
| ROFL | | Rolling On The Floor Laughing |
| R | | are |
| RTFM | | read the fucking manual |
| RTFI | | read the fucking instructions |
| RU | | are you |
| RUOK | | are you okay |
| ROTFLMAO | | Roll On The Floor Laughing My Ass Off |
| ROFLOL | | Roll On Floor Lauging Out Loud |
| RD | | Research and development |
| RR | | Rest and relaxation |
| RAT | | Remotely activated trojan |
| RBTL | | Read between the lines |
| REHI | | Hello again or Re-hi |
| RFR | | Really fucking rich |
| RFS | | Really fucking soon |
| RKBA | | Right to keep and bear arms |
| RL | | Real life |
| RLF | | Real life friend |
| RMLB | | Read my lips baby |
| RMMM | | Read my mail man! |
| RN | | Right now! |
| ROFLMAO | | Rolling on the floor laughing my ass off |
| ROTFL | | Rolling on the floor laughing |
| ROTM | | Right on the money |
| RPG | | Role playing games |
| RSN | | Real soon now |
| RTBS | | Reason to be single |
| RTDox | | Read the documentations |
| RTK | | Return to keyboard |
| RTM | | Read the manual |
| RYO | | Roll your own |
| RBAY | | Right Back At Ya |
| RE | | Regards or Hello Again |
| RFD | | Request For Discussion |
| ROTFLOL | | Rolling On The Floor Laughing Out Loud |
| RTFAQ | | Read the FAQ File |
| RUMORF | | Are You Male Or Female |
| RUUP4IT | | Are You Up For It |
| RX | | Regards |
| ROFLCOPTER | | Roll On Floor Laughing Copter (It's funny and it flies) |
| RTFM | | Read the Fucking Manual |
