| Abbreviation | Definition |
|---|---|
| RIN | Racer Identification Number |
| RIP | Run In Pace |
| RIR | Richmond International Raceway |
| RIR | Riverside International Raceway |
| RITS | Racing In The Rockies |
| RLES | Raceland Lower Elementary School |
| RLLR | Rahal Letterman Lanigan Racing |
| RLR | Rahal Letterman Racing |
| RLR | Ron Lummus Racing |
| RM | Race Modified |
| RM | Racing Machine |
| RM | Racing Midship |
| RM | Racing Model |
| RMP | Racing Motorsports Productions |
| RMR | Race Motors Replicas |
| RMR | Rocky Mountain Raceway |
| RMRE | Reher Morrison Racing Engines |
| RMS | Race Marque Systems |
| RMSR | Rocky Mountain Snowmobile Racing |
| RMSR | Rolex Middle Sea Race |