Sister Mary Louise St. John, (Order of Saint Benedict) was a member of the Benedictine Sisters of Erie, Pennsylvania. She was born March 13, 1943, in Glens Falls, New York to Joseph St. John and Alvarez DeMarsh. She entered the (now defunct) religious community at the Regina Mundi priory in Devon, Pennsylvania in 1970. In 1978, she transferred to the Erie Benedictine community and professed her perpetual monastic vows at Mount St. Benedict in 1982. She died September 14, 2003, aged 60, from complications of muscular dystrophy.