Medeon () was a town of ancient Phocis, destroyed by Philip II of Macedon along with the other Phocian towns at the termination of the Third Sacred War (in 346 BCE), and never again restored. Strabo places it on the Crissaean Gulf (in the sense of the Gulf of Corinth), at the distance of 160 stadia from Boeotia; and Pausanias says that it was near Antikyra.