| Abbreviation | Definition |
|---|---|
| RA | Runs Against |
| RAB | Ringette Association of Burlington |
| RAC | Ram Athletic Complex |
| RAC | Rhône-Alpes Courses |
| RAC | Rueil Athlétic Club |
| RACE | Racing And Car Enthusiasts |
| RACE | Remainder To Assemble A Complete Engine |
| RACMSA | Royal Automobile Club Motor Sports Association |
| RADAR | Rochester Area Disabled Athletics And Recreation |
| RAG | Reference Aps Game |
| RAGBRAI | Register Annual Great Bicycle Ride Across Iowa |
| RAGBRAI | Registers Annual Great Bicycle Race Across Iowa |
| RAGBRAI | Register's Annual Great Bicycle Race Across Iowa |
| RAGBRAI | Registers Annual Great Bike Ride Across Iowa |
| RAO | Run Against Ourselves |
| RARA | Reno Air Racing Association |
| RARS | Robot Auto Racing Simulator |
| RAS | Right Angle Sports |
| RASC | Rochester Active Sports Club |
| RASP | Rochester Action Sports Park |