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- Oakleigh Greek Orthodox College
- Oberon High School
- Olivet Christian College
- Orbost Secondary College
- Our Lady of Mercy College
- Our Lady of Sacred Heart College
- Our Lady of Sion College
- Ouyen Secondary College
- Ovens College
- Overnewton Anglican Community College
- Oxley College
- Ozford College
Read more about this topic: List Of High Schools In Victoria