O
- Okotoks
- Alberta High School of Fine Arts
- Edison School
- Education Plusokotoks
- Foothills Composite High School
- Holy Trinity Academy
- St Pauls Academy
- Strathcona-Tweedsmuir School
- Olds
- Olds Junior Senior High School
- Olds Koinonia Christian School
- Olds
- Olds Partnership School
- Onoway
- Onoway Junior Senior High School
- Oyen
- Oyen Public School
- Prairie View Colony School
- South Central High School
Read more about this topic: List Of High Schools In Alberta