Iolaidas of Argos was an ancient Greek athlete listed by Eusebius of Caesarea as a victor in the stadion race of the 139th Olympiad (224 BC). He was the second winner from Argos in the category.[1] His victory occurred at the height of the Cleomenean War, probably only a few weeks after Argos had been recaptured by the Achaean League with the aid of Antigonus III Doson of Macedon.