| Abbreviation | Definition |
|---|---|
| SYC | Youth Club |
| SYCM | Sudanese Youth Climate Movement |
| SYD | Sawston Youth Drama |
| SYD | Siyanqoba Youth Development |
| SYEC | Spokane Youth Environmental Conference (Washington; high school environmental science projects showc |
| SYES | Sindh Youth Employment Service |
| SYF | Sacramento Youth Football |
| SYFC | Singapore Youth Flying Club |
| SYFL | Sierra Youth Football League |
| SYFL | Snoop Youth Football League |
| SYFL | Splendora Youth Football League |
| SYFL | Suburban Youth Football League |
| SYFS | Southern Youth and Family Services |
| SYG | Sawston Youth Group |
| SYG | Sooyoungro Youth Group |
| SYG | Surrey Youth Games |
| SYH | Scottish Youth Hostels |
| SYH | Stoneham Youth Hockey |
| SYHA | Scottish Youth Hostels Association |
| SYI | Summer Youth Initiative |