| Abbreviation | Definition |
|---|---|
| SAY | St Anthony Youth |
| SAYA | South Asian Youth Action |
| SAYC | San Antonio Youth Commission |
| SAYEN | South Asia Youth Environment Network |
| SAYF | South Australian Youth Foundation |
| SAYF | Southern Arizona Youth Football |
| SAYO | South Angami Youth Organisation |
| SAYO | Southern Angami Youth Organization |
| SAYO | Student Athlete Youth Organization |
| SAYO | Survey of Academic and Youth Outcomes |
| SAYO | Survey of Academic Youth Outcomes |
| SAYO | Survey of Afterschool Youth Outcomes |
| SAYTC | South Australian Youth Training Centre |
| SBNDJ | Stichting Belangen Nederlandse Dove Jongeren (Dutch: Dove Foundation Interests Dutch Youth; The Netherlands) |
| SBOY | Successful Brothers Of Youth |
| SBYL | South Belfast Youth League |
| SBYL | South Bucks Youth League |
| SBYS | School Based Youth Services |
| SBYS | Social Business Youth Summit |
| SBYS | South Bay Youth Sports |