Yanis Kordatos (Greek: Γιάνης Κορδάτος; 1 February 1891 – 1961) was a Greek Marxist historian and sociologist. Kordatos wrote over twenty historical works dealing with Ancient, Byzantine, and Modern Greek history. Some of his most notable books include A History of Greek Literature from 1453-1961 (1962), The Last Days of the Byzantine Empire (1975), A History of Ancient Greek Philosophy (1946, 1975), The Commune of Thessalonica (Salonika), 1342-1349 (1975), and The Social Meaning of the Greek War of Independence of 1821 (1972). He is considered the father of Greek Marxist historiography.