The Mary Lake Augustinian Monastery, also known as Mary Lake Monastery, Mary Lake Shrine, or simply Mary Lake is an Augustinian monastery in King City, Ontario, Canada. The campus is nearly 1000 acres, residing on Keele Street, just north of 15th Sideroad (Bloomington). It is part of the Province of Saint Joseph. Mary Lake is the chief foundation of the Augustinians in Canada, and is now well known as a spiritual centre for the Catholic Archdiocese of Toronto. Mary Lake generally refers to the complex which includes the property, the monastery and shrine, and which operates the retreat centre. The shrine is named the Our Lady of Grace Shrine, whose title is taken from an Augustinian shrine in Lisbon, Portugal. The monastery motto is One mind and one heart unto God.