Brian Tierney DFC & Bar (May 7, 1922 – November 30, 2019) was a historian and a medievalist. He was educated at Pembroke College, Cambridge. He was a member of the faculty of the Catholic University of America for eight years until becoming professor of medieval history at Cornell University in 1959, becoming the Goldwin Smith Professor of Medieval History in 1969 and the first Bowmar Professor of Humanistic Studies in 1977.