| Abbreviation | Definition |
|---|---|
| SYO | Symphonic Youth Orchestra |
| SYOB | Sai Youth of Brisbane (Australia) |
| SYOM | Singapore Youth Olympic Museum |
| SYP | Scottish Youth Parliament |
| SYP | Skills for Youth Program |
| SYP | Summer Youth Pass |
| SYP | Summer Youth Programs |
| SYPD | Somali Youth for Peace and Democracy |
| SYS | Southampton Youth Services |
| SYSB | Shelton Youth Service Bureau |
| SYSO | Seattle Youth Symphony Orchestras |
| SYTC | Seattle Youth Traffic Court |
| SYTC | Student Youth Travel Club |
| SYTE | Southern Youth Theatre Ensemble |
| SYTO | Student and Youth Travel Organization |
| SYW | Synod Youth Workshop |
| SYWL | Sunnyvale Youth Wrestling League |
| TASEYI | Ti Ayiti Summer Environmental Youth Initiative |
| TASTY | Temple Akiba Senior Temple Youth |
| TAY | Total Available Youth |