| Abbreviation | Definition |
|---|---|
| RRFF | River Run Foundation Fund |
| RRFFD | River Run Foundation Fund Drive |
| RRFK | Richmond Ride For Kids |
| RRI | Refugee Relief International |
| RRII | Refugee Relief International, Inc. |
| RRIN | Rubber Research Institute of Nigeria |
| RRN | Research Resource Network |
| RRPI | Rosa and Raymond Parks Institute |
| RRPISD | Rosa and Raymond Parks Institute for Self Development |
| RRR | Risk Reduction and Rehabilitation |
| RRRA | Road Rescue Recovery Association |
| RRSP | River Rat Scholarship Program |
| RRT | Rapid Relief Team |
| RRTF | Reconstruction and Return Task Force |
| RRVA | Red River Valley Association |
| RRVFPA | Red River Valley Fighter Pilots Association |
| RSACi | Recreational Software Advisory Council on the Internet |
| RSAIY | Running Strong for American Indian Youth |
| RSB | Related Societies Board |
| RSBP | Royal Society of Bird Protection |