Blanche Barton (born Sharon Densley; October 2, 1961) is an American religious leader who is Magistra Templi Rex within the Church of Satan, and is addressed by Satanists as Magistra Barton.
She was born and raised in San Diego, and graduated Phi Beta Kappa from Redlands College with a degree in journalism and literature. She met church leader Anton LaVey the day after Diane Hegarty, the previous high priestess, left the Black House. Barton succeeded Hegarty as High Priestess of the Church. She remained High Priestess until April 30, 2002, when she appointed Peggy Nadramia as High Priestess and assumed Nadramia's previous role of chairmistress of the Council of Nine. In 1999 she led an unsuccessful campaign to raise $400,000 with which to repurchase the Black House, where many of the church's notorious rites were performed.
Barton wrote The Church of Satan: A History of the World's Most Notorious Religion (1990) and The Secret Life of a Satanist: The Authorized Biography of Anton LaVey (1990).