OYS
| 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 |