The Grey Nuns are a Canadian religious institute of Roman Catholic religious sisters, founded in 1737 by Marguerite d'Youville, a young widow. Later, the Grey Nuns were commonly employed within Residential Schools operated by the Catholic Church.

The Lebret (Qu’Appelle, St. Paul’s, Whitecalf) Industrial School, (1884 – 1998) , operated by the Roman Catholic Church (Missionary Oblates of Mary Immaculate and the Grey Nuns) from 1884 until 1973, was one of the first three industrial schools that opened following the recommendations of the Davin Report, and was fully funded by the government. Lebret school has a long history as one of the first industrial schools to open and the last to close.