The Civil Administrator of Mount Athos (Greek: Πολιτικός διοικητής του Αγίου Όρους) is the civil head of government of the Monastic Republic of Mount Athos, an autonomous region in northern Greece. His seat is Karyes, Mount Athos. There are several other offices established in Thessaloniki and Ouranoupoli. Since 3 September 2019, the incumbent Civil Administrator is the businessman and Archon Offikialios of the Ecumenical Patriarchate of Constantinople, Athanasios Martinos.