Aristodemus () was a Spartan warrior, one of the many sent to the Battle of Thermopylae. He was one of only two Spartan survivors to survive, as he was not present at the last stand. Along with a comrade, Eurytus, Aristodemus was stricken with an ophthalmic disease (they were "ὀφθαλμιῶντες" as Herodotus wrote), causing King Leonidas to order the two to return home before the battle, but Eurytus turned back, though blind, and met his end charging into the fray.