Simon Atumano (Greek: Σίμων ὁ Ἀτυμάνος) was the Bishop of Gerace in Calabria from 23 June 1348 until 1366 and the Latin Archbishop of Thebes thereafter until 1380. Born in Constantinople, Atumano was of Greco-Turkish origin, his surname deriving from the word "Ottoman." He was a humanist and an influential Greek scholar during the Italian Renaissance.