| Abbreviation | Definition |
|---|---|
| RBGB | Ross Bain Green Building |
| RBMS | River Basin Management Society |
| RBU | Rubber Band Unit |
| RCA | Richmond Community Association |
| RCA | Rodeo Cowboy Association |
| RCA | Rural Cellular Association |
| RCAC | Roofing Contractors Association of California |
| RCB | Readymix Concrete Bureau |
| RCBPO | Reformed Christian Business and Professional Organization |
| RCCM | Registre Commerce Et Credit Mobilier |
| RCDSO | Royal College of Dental Surgeons of Ontario |
| RCGA | Royal Canadian Golf Association |
| RCI | Roof Consultants Institute |
| RCM | Royal College of Midwives |
| RCMAC | Raw Cotton Marketing Advisory Committee |
| RCMAC | Regional Chartered Mediator Accreditation Committee |
| RCO | Recycling Council of Ontario |
| RCoA | Royal College of Anaesthetists |
| RCOP | Royal College Of Physicians |
| RCP | Royal College of Physicians |