Theodor Gangauf (November 1, 1809 – September 15, 1875) was a German Catholic theologian born in Bergen, Bavaria.
He received his ordination in 1833, and in 1836 joined the Benedictine Order in Augsburg.
From 1841 until his death in 1875 he was a professor of philosophy at the Lyceum at Augsburg.
Gangauf was a follower of Anton Günther's philosophical system, and an advocate of Augustinian theology.
He was the author of two noted works on St. Augustine: This article about a German theologian is a stub.