Thyraion (Ancient Greek: Θυραῖον, Latin: Thyraeum) was a city in Arcadia, ancient Greece. It was already ruined in the 2nd century AD, when it was visited by Pausanias. It was near Hypsous (present Stemnitsa), Zoetia and Paroria. Thyraion was founded by Thyraeus, a son of Lycaon. The location of Thyraion has been identified with that of the present village Pavlia, north of Megalopoli.