Ousas or Ousana(s) (c.500) was a king of Axum. He is primarily known from the coins minted during his reign.
Because the gold coins issued with this king's name closely resemble those of King Kaleb, Munro-Hay suggests that Ousas may be another name of Tazena, who is described both in Ethiopian tradition and on Kaleb's coins as his father.S. C. Munro-Hay, Aksum: An African Civilization of Late Antiquity (Edinburgh: University Press, 1991), pp. 84, 88.