St. Marcellinus Secondary School is a Catholic high school located in Mississauga, Ontario, Canada.
It offers classroom instruction for grades 9-12, and is a member of the Dufferin-Peel Catholic District School Board.
The school opened in 2003 at a temporary location in Streetsville, Mississauga.
In September 2004, St. Marcellinus moved to its current location at 730 Courtney Park Drive West, Mississauga, Ontario L5W 1L9.
The school shares its facilities with the Courtney Park Community Centre, as well as with the Courtney Park branch of the Mississauga Library System.
St. Marcellinus Secondary School is one of the many high schools in Mississauga.
