St. Mary's Indian Residential School was the name of two Indian residential schools in Mission, British Columbia. The first was operated by the Roman Catholic Church of Canada, and the second was operated by the Canadian federal government. Approximately 2,000 children attended the schools while they were in operation, most of them Stó:lō, many of whom reported experiences that were abusive. However, despite the numerous personal accounts of students who suffered abuse at the school, there is no acknowledgement of this on any of the plaques at the site.
St. Mary's was initially opened by the Missionary Oblates of Mary Immaculate in 1863 as a small school for boys, and housed 42 students its first year. A separate school for girls was opened on the same site in 1868, and operated by the Sisters of Saint Ann. It operated quite near the Fraser River for nearly two decades, then moved further uphill in 1882 to make room for the construction of the Canadian Pacific Railway.
The boys and girls had separate dormitories, with the girl's residence also housing the nuns' quarters, an infirmary, a recreation room and a chapel. The boys residence housed all of the boys on the third floor, the Oblate priests on the second floor, and a chapel, playhall and classroom on the first floor.
The complex also featured a tennis court (for the use of priests and nuns); an automotive shop; a slaughterhouse; a dining hall; a laundry house; a milking barn and silo; a bakery; an older boxing gym and a newer gymnasium (built in the late 1940s or early 1950s); a pig pen; and several classrooms.
In its early days, the school emphasized academics and Catholic catechism, but the education shifted towards agricultural and industrial skills. Parents that were able to were allowed to visit, and some families would camp around the school. Students were also able to visit the town of Mission until 1948.
In 1961, students were moved to a new government-run residential school of the same name on the eastern border of the Mission property, and the Roman Catholic school was closed down. All the buildings of the former school were demolished in 1965 as they had deteriorated badly with age.