| R | Are | - | ISO Country Codes |
| R U | Are You? | - | ISO Country Codes |
| R&D | Research & Development | - | ISO Country Codes |
| R&R | Rest & Relaxation | - | ISO Country Codes |
| RAEBNC | Read And Enjoyed, But No Comment | - | ISO Country Codes |
| RAT | Remotely Activated Trojan | - | ISO Country Codes |
| RB@YA | Right Back At Ya | - | ISO Country Codes |
| RBAY | Right Back At You | - | ISO Country Codes |
| RBTL | Read Between The Lines | - | ISO Country Codes |
| RC | Remote Control | - | ISO Country Codes |
| RCI | Rectal Cranial Inversion (Head Up Ass) | - | ISO Country Codes |
| RE | Hello Again | - | ISO Country Codes |
| RE | Regards | - | ISO Country Codes |
| RE | Reply | - | ISO Country Codes |
| REHI | Hi Again | - | ISO Country Codes |
| RFD | Request For Discussion | - | ISO Country Codes |
| RFR | Really F*cking Rich | - | ISO Country Codes |
| RFS | Really F*cking Soon | - | ISO Country Codes |
| RGR | Roger | - | ISO Country Codes |
| RHIP | Rank Has Its Privileges | - | ISO Country Codes |
| RIYL | Recommended If You Like | - | ISO Country Codes |
| RKBA | Right To Keep And Bear Arms | - | ISO Country Codes |
| RL | Real Life | - | ISO Country Codes |
| RLCO | Real Life Conference | - | ISO Country Codes |
| RLF | Real Life Friend | - | ISO Country Codes |
| RM | Remake | - | ISO Country Codes |
| RMB | Ring My Bell | - | ISO Country Codes |
| RMLB | Read My Lips Baby | - | ISO Country Codes |
| RMMA | Reading My Mind Again | - | ISO Country Codes |
| RMMM | Read My Mail, Man | - | ISO Country Codes |
| RN | Right Now | - | ISO Country Codes |
| RNN | Reply Not Necessary | - | ISO Country Codes |
| ROFL | Rolling On Floor Laughing | - | ISO Country Codes |
| ROR | Raffing Out Roud ("Laughing Out Loud" In Scooby-doo Dialect) | - | ISO Country Codes |
| ROTFL | Rolling On The Floor Laughing | - | ISO Country Codes |
| ROTFLMAO | Rolling On The Floor Laughing My Ass Off | - | ISO Country Codes |
| ROTFLMFAO | Rolling On The Floor Laughing My F*cking Ass Off | - | ISO Country Codes |
| ROTFLOL | Rolling On The Floor Laughing Out Loud | - | ISO Country Codes |
| ROTGL | Rolling On The Ground Laughing | - | ISO Country Codes |
| ROTGLMAO | Rolling On The Ground Laughing My Ass Off | - | ISO Country Codes |
| ROTM | Right On The Money | - | ISO Country Codes |
| RPG | Role Playing Games | - | ISO Country Codes |
| RRQ | Return Receipt Request | - | ISO Country Codes |
| RRR | HaR HaR HaR (instead Of LOL) | - | ISO Country Codes |
| RSN | Real Soon Now | - | ISO Country Codes |
| RSVP | R?pondez S'il Vous Pla?t (French For, Reply If You Please) | - | ISO Country Codes |
| RT | Real Time | - | ISO Country Codes |
| RTBM | Read The Bloody Manual | - | ISO Country Codes |
| RTBS | Reason To Be Single | - | ISO Country Codes |
| RTFAQ | Read The FAQ | - | ISO Country Codes |
| RTFF | Read The F*cking FAQ | - | ISO Country Codes |
| RTFI | Read The F*cking Instructions | - | ISO Country Codes |
| RTFM | Read The F*cking Manual | - | ISO Country Codes |
| RTFQ | Read The F*cking Question | - | ISO Country Codes |
| RTH | Release The Hounds | - | ISO Country Codes |
| RTI | Read The Instructions | - | ISO Country Codes |
| RTK | Return To Keyboard | - | ISO Country Codes |
| RTM | Read The Manual | - | ISO Country Codes |
| RTSM | Read The Silly Manual | - | ISO Country Codes |
| RTTSD | Right Thing To Say Dude | - | ISO Country Codes |
| RTWFQ | Read The Whole F*cking Question | - | ISO Country Codes |
| RU | Are You? | - | ISO Country Codes |
| RU/18 | Are You Over 18? | - | ISO Country Codes |
| RUFKM | Are You F*cking Kidding Me? | - | ISO Country Codes |
| RUH | Are You Horny? | - | ISO Country Codes |
| RUMCYMHMD | Are You On Medication Cause You Must Have Missed A Dose | - | ISO Country Codes |
| RUMORF | Are You Male OR Female? | - | ISO Country Codes |
| RUNTS | Are You Nuts? | - | ISO Country Codes |
| RUOK | Are You OK? | - | ISO Country Codes |
| RUS | Are You Serious? | - | ISO Country Codes |
| RUSOS | Are You SOS (in Trouble)? | - | ISO Country Codes |
| RUT | Are You There? | - | ISO Country Codes |
| RUUP4IT | Are You Up For It? | - | ISO Country Codes |
| RX | Regards | - | ISO Country Codes |
| RYFM | Read Your Friendly Manual | - | ISO Country Codes |
| RYO | Roll Your Own | - | ISO Country Codes |
| RYS | Read Your Screen | - | ISO Country Codes |
