Euthydemus may refer to: PeopleEuthydemus (commander), (late 5th century BC) a fleet commander for Athens during the Sicilian Expedition, 415 to 413 BCEuthydemus, (5th/4th century BC) son of Cephalus, mentioned in Plato's RepublicEuthydemus I, (3rd century BC) a ruler of the Greco-Bactrian KingdomEuthydemus II, (2nd century BC) a ruler of the Greco-Bactrian KingdomEuthydemus (tyrant), (3rd century BC) a tyrant of Sicyon DialoguesEuthydemus (dialogue), a dialogue by Plato Name Euthydemos… (More on Euthydemus)