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Our secondary schools offer programs for Grades 9 to 12. To receive an Ontario Secondary School Diploma, students are required to complete at least 30 credits in secondary school, 18 of which are compulsory courses (one credit for one course).
To learn more about our secondary schools and the programs offered at each school, click on the flyers below:
| Name of Secondary School | Location | Flyer |
| All Saints Catholic Secondary School | 3001 Country Lane Whitby, ON L1P 1M1 |
All Saints flyer |
| Archbishop Denis O'Connor Catholic High School | 80 Mandrake Street Ajax, Ontario, L1S 5H4 |
Archbsihop Denis O'Connor flyer |
| Father Leo J. Austin Catholic Secondary School | 1020 Dryden Blvd. Whitby, ON L1R 2A2 |
Austin flyer |
| Monsignor John Pereyma Catholic Secondary School | 316 Conant Street, Oshawa, Ontario L1H 3S6 |
Pereyma flyer |
| Monsignor Paul Dwyer Catholic High School | 700 Stevenson Road North, Oshawa, ON L1J 5P5 |
Dwyer flyer |
| Notre Dame Catholic Secondary School |
1375 Harwood Ave N
|
Notre Dame flyer |
| St. Mary Catholic Secondary School | 1918 Whites Road Pickering ON L1V 1R9 |
St. Mary flyer |