Marie-Marguerite d'Youville, Canadian nun and saint, founded Grey Nuns (died 1771)

Marguerite d'Youville, SGM was a French Canadian widow who founded the Sisters of Charity of Montreal, commonly known as the "Grey Nuns". She was canonized by Pope John Paul II in 1990, becoming the first native-born Canadian to be declared a saint.

The Sisters of Charity of Montreal, formerly called The Sisters of Charity of the Hôpital Général of Montreal and more commonly known as the Grey Nuns of Montreal, is a Canadian religious institute of Roman Catholic religious sisters, founded in 1737 by Marie-Marguerite d'Youville, a young widow.