Euthydemus (Greek: Εὐθύδημος, Euthydemes), written c. 384 BC, is a dialogue by Plato which satirizes what Plato presents as the logical fallacies of the Sophists. In it, Socrates describes to his friend Crito a visit he and various youths paid to two brothers, Euthydemus and Dionysodorus, both of whom were prominent Sophists and pankrationists from Chios and Thurii.