Chaminade College School was founded in 1964 by the Archdiocese of Toronto as a private boys' high school to serve the growing northwest region of the city. The school opened in September 1965 under the direction of the Society of Mary, the Marinists, and bears the name of the order's founded, Father William Joseph Chaminade.
The mandate of the school was to prepare young men for post-secondary education in a traditional Catholic secondary school environment. The school's motto “Fortes in fide” emphasizes the importance of the virtue of faith in the life of the Catholic school.
In 1967 Chaminade, along with 13 other Catholic high schools, entered into a partnership with the Board. The Board operated the first two years of secondary school and the Archdiocese ran the remainder. From September 1972 to June 1988 the school was administered by the Irish Christian Brothers. After completion of the system in 1984 the Brothers administered the school until June 1987 and withdrew in June 1988. Now the school is administered and operated by the Board
