Regina Protmann (1552 – 18 January 1613) was a Roman Catholic religious sister. She founded the Sisters of Saint Catherine and was a pioneer in the establishment of hospitals as well as schools for girls. Her first biographer was the Jesuit Engelbert Keilert who described her as an intelligent and well-versed woman with a deep faith and sense of conviction. Her beatification was celebrated on 13 June 1999 in Warsaw.