Cardinal Leger Secondary School is a separate school in the downtown sector of Brampton, Ontario, Canada. It is a member of the Dufferin-Peel Catholic District School Board and is connected to both St. Mary's Parish and St. Annes. The school enrolls about 1,233 students.

Cardinal Leger opened in 1976, originally named St. Stephens. The school expanded in 1980 and underwent major renovations in 1995 in order to attain its current modern appearance. It was the first Catholic high school in Brampton.

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• Education in Ontario
• List of secondary schools in Ontario