John S. Koliopoulos (el|Ιωάννης Σ. Κολιόπουλος, 1942–2022[1]) (Ioannis Koliopoulos in modern transliteration) was a Greek historian, born in the village of Votani, Kastoria in 1942.
He was the author of Plundered loyalties: Axis occupation and civil strife in Greek West Macedonia, 1941-1949,[2] Brigands with a Cause[3] and other books on Greek history, and co-author of Greece: A Modern Sequel with Thanos Veremis,[4] Professor of Political History at Athens University and President of the board of ELIAMEP.
He was Professor Emeritus of Modern Greek History at Aristotle University of Thessaloniki.[5]