St. Mary Catholic Secondary School (Pickering, Ontario)

St. Mary Catholic Secondary School is a Catholic secondary school located in Pickering, Ontario, Canada established in 1987. Operated by the Durham Catholic District School Board (DCDSB), it is the only Catholic high school located in Pickering.

Non-Uniform Day Enforcement
On March 22, 2012, approximately 200 to 300 students were sent home due to wearing either shorts, khakis, capris and/or ankle socks, sparking outrage amongst students and parents. The administration at St. Mary claims the rule was in the student agenda, reminded the students about the rule the day before, and dismissed allegations of student suspensions.

2019-2020 Yearbook
On October 10, 2020, St. Mary Catholic Secondary School had sent out its 2019-2020 yearbook to the graduates of that school year. It was then brought to light that a black man's quote was changed from him commemorating his grandma and thanking her for her support of his years of high school, to a racist message. This made the school issue a return on all yearbooks and announcing an investigation on the people who had changed his quote.

Days later, on October 16, 2020, nine more students came out saying that their quotes have been changed too. One criticized a female student's body image, another targeted a male student's grade. The nine people were a mix of male and female students from various cultural backgrounds.