YSO
| Acronym | Definition |
|---|---|
| YSO | Yellow Springs, Ohio |
| YSO | Young Stellar Object |
| YSO | Yale Symphony Orchestra |
| YSO | Yamagata Symphony Orchestra (Japan) |
| YSO | Youth Service Officer |
| YSO | Youth Soccer Organization (various organizations) |
| YSO | Yttrium Oxyorthosilicate |
| YSO | Youngstown Symphony Orchestra (Youngstown, OH) |
| YSO | York Symphony Pops Orchestra |
| YSO | Ylivieskan Sosiaalialan Oppilaitos (Finnish: Ylivieska Social Institution; Ylivieska, Finland) |
| YSO | Youth Sector Organisation (Singapore) |