| Abbreviation | Definition |
|---|---|
| RAP | Resident Associate Program |
| RAPT | Rehabilitation of Addicted Prisoners Trust |
| RAW | River Alliance of Wisconsin |
| RBCU | Russian Bird Conservation Union |
| RBF | Retired Boxers Foundation |
| RBF | Rockefeller Brothers Fund |
| RBI | Rebirthing Breathwork International |
| RBL | Royal British Legion |
| RBRC | Rechargeable Battery Recycling Corporation |
| RBTU | Red Bluff Trails United |
| RC | Rotary Club |
| RCA | Recovering Couples Anonymous |
| RCAC | Regional Contracting Assistance Center, Inc. |
| RCC | Rachel Carson Council |
| RCC | Rotary Community Corps |
| RCCI | Rachel Carson Council, Inc. |
| RCDI | Roman Catholic Dragons International |
| RCDR | Rural Community Development Resources |
| RCM-SAR | Royal Canadian Marine - Search and Rescue (British Columbia, Canada) |
| RCO | Regional Coordinating Officer |