| Abbreviation | Definition |
|---|---|
| RTAM | Railway Tourism Association Malaysia |
| RTAO | Real Truth About Obama |
| RTAS | Reiki Tummo Association Singapore |
| RTC | Rails-to- Trails Conservancy |
| RTC | Reach The Children |
| RTCI | Radiation Therapy Cancer Institute |
| RTCI | Reach The Children, Inc. |
| RTCI | Rockland Teachers Center Institute |
| RTF | Residential Treatment Facility |
| RTFC | Rural Telephone Finance Cooperative |
| RTI | Rebuilding Together, Inc. |
| RTMF | Right To Manage Federation |
| RTPI | Roger Tory Peterson Institute |
| RTPP | Ride To Pride Partnership |
| RTSA | Retail Trading Standards Association |
| RTTV | Remembering The True Victims |
| RUHF | Royal University Hospital Foundation |
| RUHU | Raising Up Hope for Uganda |
| RUW | Rappahannock United Way |
| RVAF | Richard L. Von Amelunxen Foundation |