Augustin Fliche (19 November 1884, Montpellier – 19 November 1951, ibid.) 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. He also wrote overviews of the history of the Middle Ages.
From 1935, he directed with Victor Martin a Histoire de l'Église depuis les origines jusqu'à nos jours published by Bloud and Gay.
In 1941, he was elected a member of the Académie des Inscriptions et Belles-Lettres.