| Abbreviation | Definition |
|---|---|
| SCCY | Sacramento County Coalition for Youth |
| SCCY | Service Canada Centres for Youth |
| SCCY | Swanson Correctional Center for Youth |
| SCOTTY | Star City Organization of Terrific Temple Youth |
| SCPY | Scott County Partners for Youth (Kansas) |
| SCPY | Serb-Croat Progressive Youth |
| SCY | Strengthening Chicago's Youth |
| SCY | Summit County Youth |
| SCY | Supporting Community Youth |
| SDIY | Sustainable Development Indicators For Youth |
| SDY | Swiss Deaf Youth |
| SDYO | Saint Dominic Youth Organization |
| SDYO | Social Democratic Youth Organization |
| SEPY | Self Employment Programme for Youth |
| SEYA | South Etobicoke Youth Assembly |
| SEYO | Sioux Empire Youth Orchestras |
| SEYO | Sistema Europe Youth Orchestra |
| SEYO | South East Youth Organization |
| SFYB | San Francisco Youth Ballet |
| SFYEC | San Francisco Youth Employment Coalition (California) |