St. Robert CHS was opened by the York Catholic District School Board in 1975,[5] and it celebrated its 40th anniversary in 2015.It is named after its patron saint, St. Robert Bellarmine.The extension added in January 1989 completes the school as it stands today.St. Robert CHS is consistently ranked as one of the top secondary schools in Ontario according to the Fraser Institute.[7] St. Robert CHS received outstanding placements in the University of Waterloo's Euclid Mathematics Contest, known for its challenging and innovative problems,[8] placing 2nd in 2024,[9] 7th in 2023,[10] 1st in 2022,[11] and 4th in 2021.