John S. Koliopoulos (Greek: Ιωάννης Σ. Κολιόπουλος) (Ioannis Koliopoulos in modern transliteration) is a Greek historian, born in 1942.
Koliopoulos subscribes to a modernist "imagined community" approach to nationalism and identity and proposes modern Greeks are unrelated to ancient counterparts. His views sharply contrast with Anthony D. Smiths's view that Greek ethnic continuity can be considered legitimate due to reproduction of key culture attributes. Modern DNA studies also contradict Koliopoulos thesis of no connection. He has been accused by some Greek public figures of being anti-Hellenic and motivated by personal politics related to the name dispute.
He is the author of Plundered loyalties : Axis occupation and civil strife in Greek West Macedonia, 1941-194,[1] Brigands with a Cause[2] and other books on Greek history, and co-author of Greece: A Modern Sequel with Thanos Veremis,[3] Professor of Political History at Athens University and President of the board of ELIAMEP.
He is Professor Emeritus of Modern Greek History at Aristotle University of Thessaloniki.[4]