Abydenus (Α᾿βυδηνός) was a Greek historian who wrote a history of Assyria (Α᾿σσυριακά), of which some fragments are preserved by Eusebius, Cyril, Syncellus, and Moses of Chorene. His work was valuable for chronology, and a fragment found I -the Armenian translation of the Chronicon of Eusebius settles some difficulties in Assyrian history. The time at which he lived is not certain; he must, however, belong to a later period than Berosus, one of his authorities, who lived about B.C. 250. The fragments of his history are collected in Scaliger's work De Emendation temporum, and more completely in Richter's Berosi Chalcei Historie qus Supersunt, etc. (Leips. 1825).