| Abbreviation | Definition |
|---|---|
| SRBJ | Stretem Rod Blong Jastis |
| SRY | Solid Rock Youth |
| SSJCA | Sutherland Shire Junior Cricket Association (Australia) |
| SSKY | Supreme Success Key to Youth |
| SSTY | Shaarai Shomayim Temple Youth |
| SSY | Scottish Socialist Youth |
| SSYC | Second Street Youth Center |
| SSYC | South Street Youth Center |
| SSYHA | Steamboat Springs Youth Hockey Association (Colorado) |
| SSYS | Sandy Springs Youth Sports |
| SSYS | Smith Station Youth Soccer |
| STAY | Services for Transition Age Youth |
| STAY | Stay Together Appalachian Youth |
| STAY | Supporting Together Area Youth |
| STEADY | Support and Training for Elation and Depression in Youth |
| STOP | Stop Telling On People |
| STORY | Strategy Training and Organizing Resources for Youth |
| STYLE | Strategic Transitions for Youth Labour in Europe |
| SUNNY | Serving Up Nutrition Now for Youth |
| SVYM | Swami Vivekananda Youth Movement |