Diocese of Abydos (Greek: Επισκοπή Αβύδου) is titular see of the Ecumenical Patriarchate of Constantinople.
The earliest bishop mentioned in extant documents is Marcian, who signed the joint letter of the bishops of Hellespontus to Emperor Leo I the Thracian in 458, protesting about the murder of Proterius of Alexandria.
A letter of Peter the Fuller (471–488) mentions a bishop of Abydus called Pamphilus.
Ammonius signed the decretal letter of the Council of Constantinople in 518 against Severus of Antioch and others.
[6] In the 19th century the bishopric of Abydos was revived as the titular see of the Patriarchate of Constantinople.