| Abbreviation | Definition |
|---|---|
| RCP | Raptor Conservation Program |
| RCR | River City Regiment |
| RCRC | Religious Coalition for Reproductive Choice |
| RCRC | Rio Colorado Reclamation Committee |
| RCS | Red Crescent Societies |
| RCS | Red Crescent Society |
| RCSW | Respiratory Care Society of Washington |
| RCTC | RARE Center for Tropical Conservation |
| RCTI | Rape Crisis Training Institute |
| RCWPV | Rotary Club of Woodside- Portola Valley |
| RCYC | Royal Canadian Yacht Club (Toronto) |
| RDF | Rural Development Foundation |
| RDI | Regenerative Design Institute |
| RDLF | Robert and Dee Leggett Foundation |
| RDP | Relief Delivery Plan |
| RDPP | Rural Development Preaching Project |
| RDRP | Racing Dog Rescue Project |
| REACH | Real-Time Electronic Access for Caregivers and the Homeless |
| REACH | Romanian Emergency Aid and Community Help |
| REACT | Regional Emergency Assistance & Communication Team |