| Abbreviation | Definition |
|---|---|
| RAP | Responsible Adventurous People |
| RASC | Royal Astronomical Society of Canada |
| RAT | Renaissance Action Team |
| RBA | Rebuildable Atomizer |
| RBD | Restaurant, Billiards, and Daiquiris |
| RBOC | Recreational Boaters Of California |
| RBR | Rather Be Riding |
| RBS | Rubber Band Society |
| RC | Radio Controlled |
| RC | Rock Collection |
| RCC | Radio Control Car |
| RCC | Rosh Chodesh Club |
| RCH | Remote Control Helicopter |
| RCM | Radio Control Modeler |
| RCN | Ragdoll Connection Network |
| RCR | Retromobil Club Romania |
| RCRC | Rocket City Radio Controllers |
| RCT | Radio Controlled Toy |
| RDQ | Rainy Day Quilters |
| RFD | Razor Fen Downs |