Euthydemus (Greek: Εὐθύδημος) may refer to: People Euthydemus, a fleet commander for Athens during the Sicilian Expedition, 415 to 413 BC Euthydemus, a 5th century sophist who features in Plato's Euthydemus Euthydemus, a son of Cephalus is mentioned in Plato's Republic Euthydemus, a son of Diocles is mentioned in Xenophon's Memorabilia Euthydemus I (3rd century BC), ruler of the Greco-Bactrian Kingdom Euthydemus II (2nd century BC), ruler of the Greco-Bactrian Kingdom Euthydemus (tyrant) (3rd century BC), tyrant of Sicyon Dialogues Euthydemus, a dialogue by Plato