Kallistos Ware (born Timothy Richard Ware, 11 September 1934) is an English bishop and theologian of the Eastern Orthodox Church.
He has held since 1982 the titular bishopric of Diokleia in Phrygia (Greek: ?????e?a F????a?), later made a titular metropolitan bishopric in 2007, under the Ecumenical Patriarchate of Constantinople.
He is one of the best-known contemporary Eastern Orthodox hierarchs and theologians.
From 1966 to 2001, he was Spalding Lecturer of Eastern Orthodox Studies at the University of Oxford.