Notre Dame Catholic Secondary School is a high school located in Ajax, Ontario, Canada. It was opened in 2001 along with its twin school J. Clarke Richardson Collegiate. Notre Dame and Richardson share the same building, with Notre Dame occupying the north wing and Richardson the south. The cafeteria is the physical divider between the two high schools and is shared by both, along with the theatre and the football field. The layouts of Notre Dame and Richardson are essentially identical except for a few minor differences in the shop classrooms and the gymnasiums.