Theodorus Gaza or Theodore Gazis (, "Theodoros Gazis"; ; ), also called by the epithet Thessalonicensis (in Latin) and Thessalonikeus (in Greek) (c. 1398 – c. 1475), was a Greek humanist and translator of Aristotle, one of the Greek scholars who were the leaders of the revival of learning in the 15th century (the Palaeologan Renaissance).