| Acronym | Definition |
|---|
| OYS➣Oulun Yliopistollinen Sairaala (Oulu, Finland) |
| OYS➣Office of Youth Services |
| OYS➣Outstanding Young Scientist (award) |
| OYS➣Opportunities for Young Scientists |
| OYS➣Ogrenci Yerlestirme Sinavi (Turkish university exam; defunct since 1999) |
| OYS➣Ontario Youth Senate |
| OYS➣Online Youth Services |