| Abbreviation | Definition |
|---|---|
| RCNM | Racing Club Narbonne Mediterranee |
| RCR | Race Car Replicas |
| RCRA | Rock Creek Racing Association |
| RCRS | Russian Circuit Racing Series |
| RCSA | Racing Club de Strasbourg Alsace |
| RCTU | Regional Cortical Tracer Uptake |
| RCVD | Race Car Vehicle Dynamics |
| RCW | Racing Center Warsaw |
| RCZ | Racing Concept Zagato |
| RCZ | Racing Concept Zooms |
| RD | Race Developed |
| RDC | race deZert com |
| RDLV | Race Day Las Vegas |
| RDO | Race Day ONLY |
| RDO | Race Day Optimized |
| RE | Racing Eagles |
| REAT | Race Equality Action Team |
| RECS | Race Environment Construction System |
| REIC | Race/Ethnicity Information Center |
| RETRACE | Retracing |