DATED ACADEMIC COMPARISON
Top 10 catholic secondary schools (high schools) in Durham Region
Use this list to start a school shortlist, then look at the grades, programs and official admissions information in each guide.
2025 report · 2023/2024 academic results
Scores reflect one historical academic measure. Equal scores share a position.
- 1position
Whitby
All Saints Catholic Secondary School
Grades 9–12; Grades 7–8 through the Regional Arts & Media Program · English
Durham Catholic District School Board
Read the school guide7.9out of 102023/2024 results - 2position
Ajax
Notre Dame Catholic Secondary School
Grades 9–12 · English
Durham Catholic District School Board
Read the school guide7.1out of 102023/2024 results - 2position
Pickering
St. Mary Catholic Secondary School
Grades 9–12 · English
Durham Catholic District School Board
Read the school guide7.1out of 102023/2024 results - 4position
Whitby
École secondaire catholique Saint-Charles-Garnier
Grades 7–12 · French first language
Conseil scolaire catholique MonAvenir
Read the school guide6.6out of 102023/2024 results - 5position
Whitby
Father Leo J. Austin Catholic Secondary School
Grades 9–12 · English
Durham Catholic District School Board
Read the school guide6.4out of 102023/2024 results - 6position
Clarington · Bowmanville
St. Stephen Catholic Secondary School
Grades 9–12 · English; French Immersion options
Peterborough Victoria Northumberland and Clarington Catholic District School Board
Read the school guide6.1out of 102023/2024 results - 7position
Ajax
Archbishop Denis O’Connor Catholic High School
Grades 9–12 · English
Durham Catholic District School Board
Read the school guide5.9out of 102023/2024 results - 8position
Oshawa
Monsignor John Pereyma Catholic Secondary School
Grades 7–12 · English
Durham Catholic District School Board
Read the school guide5.6out of 102023/2024 results - 8position
Oshawa
Monsignor Paul Dwyer Catholic High School
Grades 9–12 · English
Durham Catholic District School Board
Read the school guide5.6out of 102023/2024 results - 10position
Clarington · Courtice
Holy Trinity Catholic Secondary School
Grades 9–12 · English; French Immersion options
Peterborough Victoria Northumberland and Clarington Catholic District School Board
Read the school guide5.4out of 102023/2024 results
What the comparison tells you
The 2025 Fraser Institute Ontario reports use 2023/2024 academic results. The elementary edition was released in January 2026 and the secondary edition in November 2025. These are historical indicators, not current-year test scores or a complete measure of school quality.
This category compares 10 rated catholic secondary records in Durham Region. English- and French-language schools are included. A school without a published score is not treated as lower performing. Regional and GTA positions are calculated from the published scores, rather than separate Fraser rankings.
Equal scores share a position. Ten profiles are displayed, with equal scores ordered alphabetically by the current common name, ignoring the French École prefix. Any schools tied at the cutoff but outside those ten are named below; their results are not lower.
Fraser Institute Report Card on Ontario’s Secondary Schools 2025Official sources and check dates
- Fraser Institute Report Card on Ontario’s Secondary Schools 2025 Source checked Oct 3, 2026
These guides use AI-assisted research and dated public source records. A source check is not a school visit or a personal assessment. For a correction, choose a team member to contact.