Sagylium or Sagylion (Ancient Greek: Σαγύλιον) was a castle situated on a steep rock in the interior of ancient Pontus, which was one of the strongholds of the Pontian kings.
Its site is located near Kaletepe, Asiatic Turkey.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Sagylium". Dictionary of Greek and Roman Geography. London: John Murray.
41°04′41″N 35°20′21″E / 41.077969°N 35.339127°E