| Abbreviation | Definition |
|---|---|
| RVF | Rinconada Ventures Foundation |
| RVHR | Roanoke Valley Horse Rescue |
| RVHR | Roanoke Valley Horse Rescue, Inc. |
| RWAR | Roma Women Association in Romania |
| RWMDA | Rajasthan Weights and Measures Dealers Association |
| RWN | Refugee Women's Network |
| RXC | Red Cross Chapter |
| RYF | The Ralph Young Fund |
| RYLA | Rotary Youth Leadership Awards |
| RZS | Royal Zoological Society |
| S173AB | Society of the 173rd Airborne Brigade |
| S1ID | Society of the 1st Infantry Division |
| S28D | Society of the 28th Division Allied Expeditionary Forces |
| S3ID | Society of the 3rd Infantry Division |
| S3IDSF | Society of the 3rd Infantry Division Scholarship Foundation |
| S4C | Stand For Children |
| S5D | Society of the 5th Division |
| SA | Salvation Army |
| SA | Scholarship America |
| SAA | Spondylitis Association of America |