Catholicos (plural: Catholicoi) is a title used by the head bishop of any of certain Eastern churches.
The title is used in the Armenian Apostolic Church, which is one of the Oriental Orthodox churches. It is also used in the Georgian Orthodox and Apostolic Church, whose head carries the title Catholicos-Patriarch of All Georgia. Historically, the title was also used by the chief bishop of Caucasian Albania. See also list of Catholicoi of Armenia.
