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: Διόκλεια Φρυγίας), later made a titular metropolitan bishopric in 2007, under the Ecumenical Patriarchate of Constantinople. Metropolitan Kallistos is one of the best-known contemporary Eastern Orthodox hierarchs and theologians. From 1966 to 2001, Metropolitan Kallistos was Spalding Lecturer of Eastern Orthodox Studies at the University of Oxford.