Archbishop Denis O'Connor Catholic High School (abbreviated DO'C) is a Roman Catholic high school located in Ajax, Ontario, Canada, within the Durham Catholic District School Board. It is named for Archbishop Denis T. O'Connor, a priest who was born in Pickering in 1841, and who became the third Archbishop of Toronto, Ontario, Canada in 1899. The school has students in grades 9–12 and offers a wide range of academic and extracurricular activities. The current enrolment is approximately 600 students. The school colours are green and yellow, and its motto is Nil sine fide et labore, which is Latin for "Nothing without faith and work."
In 2024, the school celebrated the 60th anniversary of its opening in 1964.
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History
Archbishop Denis O'Connor Catholic High School was founded by Father Leo J. Austin and was officially opened in September, 1964 in Whitby, Ontario. The school was moved to its new home of Ajax in 1984. On November 18, 1984, it was officially opened and blessed by Cardinal Carter. In 1991 a major addition was constructed which increased its capacity to approximately 1,000 students.
Associate Schools
The school's students generally come from the following Catholic Elementary Schools which are all located in Ajax:
St. Jude Catholic Elementary School
St. James Catholic Elementary School,
St. Francis de Sales Catholic Elementary School
St. Bernadette Catholic Elementary School
Mother Teresa Catholic Elementary School.
Notable alumni and groups
Devin Shore, National Hockey League
Paul Peschisolido, retired professional soccer player
Candace Chapman, women's professional soccer player, member of the Canada women's national soccer team and Olympian, Olympic bronze medalist
Toya Alexis, Canadian R&B vocalist
Ruby Bhatia, India's first music veejay
Keith Godding, wide receiver, Toronto Argonauts
Michael Kostka, Ottawa Senators, Toronto Maples Leafs



