Euthydemus may refer to: People Euthydemus (commander), (late 5th century BC) a fleet commander for Athens during the Sicilian Expedition, 415 to 413 BC Euthydemus, (5th/4th century BC) son of Cephalus, mentioned in Plato's Republic Euthydemus I, (3rd century BC) a ruler of the Greco-Bactrian Kingdom Euthydemus (tyrant), (3rd century BC) a tyrant of Sicyon Dialogues Euthydemus (dialogue), a dialogue by Plato Name Euthydemos… (More on Euthydemus)