Mary Ignatius Hayes, O.S.F., also known as Mother Mary Ignatius of Jesus (1823 – 6 May 1894), was an Anglican religious sister who was later received into the Catholic Church and became a Franciscan sister. Her lifetime of religious service, in the course of which she traveled widely, led to the establishment of three separate religious congregations of Franciscan sisters and the establishment of the Poor Clare nuns in the United States.