Augustin Fliche (19 November 1884, Montpellier – 19 November 1951) was a 20th-century French historian who mainly dealt with the history of the Church in the Middle Ages.
He was a professor at the University of Montpellier and also visiting professor at the University of Leuven in 1925–1927 and 1946–1947.
He is known among other things for a biography of Philip I of France and another one of Pope Gregory VII with his reforms.