| Abbreviation | Definition |
|---|---|
| RNIB | Royal National Institute of Blind People |
| RNLI | Royal National Lifeboat Institution |
| RNLI | Royal National Lifeboats Institution |
| RNofA | Royal Neighbors of America |
| RNRF | Renewable Natural Resources Foundation |
| ROC | Resort Owners Coalition |
| ROEC | Rural Opportunities Enterprise Center |
| ROECI | Rural Opportunities Enterprise Center, Inc. |
| ROI | Rural Opportunities, Inc. |
| ROIF | Red Oak Industrial Foundation |
| ROLF | Rainbow Of Life Forces |
| ROOF | Russian Orphan Opportunity Fund |
| ROPE | Rape Outreach Prevention and Education |
| ROPE | Reaching Oppressed People Everywhere |
| ROPE | Reptile's Opportunity for Preservation and Education |
| ROR | Rivers Of Recovery |
| ROR | Rottweiler Overland Railroad |
| ROSE | Regaining One's Self Esteem |
| ROSF | Rose of Sharon Foundation |
| ROWT | Rural Oregon Wireless Television |