Cardinal Ambrozic Catholic Secondary School is a separate high school located in Brampton, Ontario, Canada, named after Aloysius Ambrozic. The school is part of the Dufferin-Peel Catholic District School Board. It ranked 130 of 749 schools in Ontario in 2018/2019. This school is a traditional Catholic school. It was named in honour of Cardinal Ambrozic who died in August 2011. Notable people who attended this school include Alessia Cara.

Cardinal Ambrozic CSS was featured in multiple news stories on March 22, 2017, when roughly one hundred parents slept outside the school in order to register their children for grade 9 at 7:30am that morning. The first parent in line arrived at the school at 12pm the day prior.