Archbishop '''Eustathius (Katafloros) of Thessalonica''', Greek: Εὐστάθιος Θεσσαλονίκης, was the [[Archbishop]] of [[Thessalonica]] of the [[Church of Constantinople]] from 1175 to 1194. He was a scholar, author, reformer, and one of foremost men of learning of his time in the Orthodox East.