| St Brother André Catholic High School | |
| Motto: | In Lumine Tuo |
| Motto Translation: | In Your Light |
| City: | Markham |
| Province: | Ontario |
| Postcode: | L3P 3K8 |
| Country: | Canada |
| Coordinates: | 43.8931°N -79.2589°W |
| Schooltype: | High school |
| Religious Affiliation: | Roman Catholic |
| Founded: | 1985 |
| Superintendent: | Jennifer Sarna |
| Trustee: | Frank S.D Alexander |
| Principal: | Christine Cosentino |
| Grades: | 9-12 |
| Enrolment: | 1419 [1] |
| Area: | Eastern Markham and Whitchurch-Stouffville |
| Colours: | red, blue, gold |
| Mascot: | Cardinal |
| Team Name: | Cardinals |
| Address: | 6160 16th Avenue East |
| Schoolboard: | York Catholic District School Board |
| Grades Label: | Grades |
| Enrolment As Of: | 2020 |
| Language: | English |
St. Brother André Catholic High School is a Catholic secondary school in Markham, Ontario, Canada. Grades 9 to 12 are taught, with religious studies included in the curriculum. It is named after Saint André Bessette (also known as Brother André), a 20th-century Catholic religious brother in Montreal responsible for the construction of the Saint Joseph's Oratory.
Brother André is located in east-central Markham, and its feeder schools include
On April 28, 2010, a fire broke out at St. Brother André Catholic High School in the boys' washroom on the second floor.[2] One person was treated for smoke inhalation and personal anxiety. Former principal Jim Nicoletti said that there was a "minor" investigation in progress by the York Regional Police.[3]