Mother Mary Pius Regnier, S.P. (April 28, 1914 – November 27, 2005) was the Superior General of the Sisters of Providence of Saint Mary-of-the-Woods, Indiana, from 1966 to 1976. She held office immediately following the Second Vatican Council, a time when Roman Catholic congregations underwent drastic changes. Regnier began the process for revising the Congregation's Constitutions to bring it into accordance with the Church's recommendations for the renewal of religious life.