| St. Mary Catholic Secondary School | |
| Motto: | Live, Love, Learn |
| Address: | 200 Whitney Avenue |
| City: | Hamilton |
| Province: | Ontario |
| Postalcode: | L8S 2G7 |
| Country: | Canada |
| Schooltype: | separate secondary school |
| Fundingtype: | Public |
| Religious Affiliation: | Catholic |
| Opened: | [1] |
| School Board: | Hamilton-Wentworth Catholic District School Board |
| Superintendent: | Tracey Ferrie |
| Trustee: | Mark Valvasori |
| School Number: | 827401 |
| Principal: | Carla D'Elia |
| Chaplain: | Don Hall |
| Grades: | 9–12 |
| Enrollment: | 905[2] |
| Enrollment As Of: | 2020 |
| School Colours: | Blue and gold |
| Team Name: | Crusaders |
St. Mary Catholic Secondary School is a Catholic secondary school located in Hamilton. It is a part of the Hamilton Wentworth Catholic District School Board.
St. Mary Catholic Secondary School opened in 1970 in the former Christ the King Elementary School. It moved to the former Hamilton Teacher's College in 1980. Due to overcrowding, planning for a new school on the current location started in 1992.[1]
St. Mary Catholic Secondary School feeder schools are: Canadian Martyrs, Guardian Angels, and St. Joseph in Hamilton; Our Lady of Mount Carmel in Carlisle; St. Augustine and St. Bernadette in Dundas; and St. Thomas in Waterdown.[3]
The woman’s program has captured 12 National Championship titles, while the men’s program earned its first national championship title in 2005.