Tithronium or Tithronion, or Tethronium or Tethronion (Τεθρώνιον), was a frontier town of ancient Phocis, on the side of Doris. Livy, who calls it Tritonon, describes it as a town of Doris, but all other ancient writers place it in Phocis. During the Greco-Persian Wars, it was destroyed by the army of Xerxes I together with the other Phocian towns in 480 BCE. It is placed by Pausanias in the plain at the distance of 15 stadia from Amphicleia.