| School Name | Street_Address | City | Province |
| Oak Learners |
394 Royal York Road
Map It |
Etobicoke | ON |
| Oakville Christian School |
112 Third Line
Map It |
Oakville | ON |
| Oakwood Academy |
2150 Torquay Mews
Map It |
Mississauga | ON |
| Olivet School |
279 Burnhamthorpe Road
Map It |
Etobicoke | ON |
| Ontario Virtual School |
4773 Yonge Street, Unit 4M
Map It |
Toronto | ON |
| Orangeville Christian School |
553281 County Road 16
Map It |
Mono | ON |
| Ottawa Christian School |
255 Tartan Drive
Map It |
Ottawa | ON |
| Ottawa Torah Institute & Machon Sarah Girls High School |
1119 Lazard St.
Map It |
Ottawa | ON |
| Oxford Reformed Christian School |
308 Church Street., P.O. Box 68
Map It |
Springford | ON |