Blessed Mary Catherine of St. Augustine, OSA (French: Marie-Catherine de Saint-Augustin) (†1668) was a French canoness regular who was instrumental in the development of the Hôtel-Dieu de Québec in service to the colony of New France. Due to her self-sacrifice for both the European settlers of the colony and for the native inhabitants, Catherine came to be honored as one of the six founders of the Catholic Church in Canada, representing the contributions of the Augustinian canonesses. She has been beatified on 23 April 1989 by Pope John Paul II and her feastday is celebrated on 8 May.