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Archbishop Denis O'Connor Catholic High School

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Archbishop Denis O'Connor Catholic High School
The front entrance of Archbishop Denis O'Connor Catholic High School.
80 Mandrake Street

L1S 5H4

TypeCatholic school, high school
MottoNil sine fide et labore
School districtDurham Catholic District School Board
School number703923
PrincipalMr. D. Chambers
Enrollment585[1] (2019/2020)
LanguageCanadian English, and Canadian French
Colour(s)    Green and Yellow
AthleticsBaseball, Soccer and Basketball
Uniform colours      Green, Grey, and White
WebsiteArchbishop Denis O'Connor Catholic High School

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 912 and offers a wide range of academic and extracurricular activities. The current enrollment is approximately 600 students.[citation needed] 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 2014, the school celebrated the 50th anniversary of its opening in 1964.


Archbishop Denis O'Connor Catholic High School was founded by Father Leo J. Austin and was officially opened in September, 1964 in Whitby, Ontario.[citation needed] 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.[citation needed] In 1991 a major addition was constructed which increased its capacity to approximately 1,000 students.[2]


The school is home to a wide variety of athletic and academic activities. It has highly talented sports teams, such as their senior boys basketball team and Varsity Boys Baseball Team. The senior boys' soccer team has proved to be one of the most successful teams in the Durham Region, winning five Lake Ontario Secondary School Association (LOSSA) championships in a row.[citation needed]

Associate Schools

The school's students generally come from the following Catholic Elementary Schools which are all located in Ajax:[citation needed]

  • 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

See also


  1. ^ "Archbishop Denis O'Connor Catholic High School (703923)". Ministry of Education. Retrieved 18 June 2021.
  2. ^ Reflections in Time - Catholic Education in Durham Region (1969-1994), Pickering-Ajax Digital Archive Archived February 1, 2014, at the Wayback Machine. Retrieved 2014-01-21
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Archbishop Denis O'Connor Catholic High School
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