Ammonius Hermiae (/əˈmoʊniəs/; Greek: Ἀμμώνιος ὁ Ἑρμείου, translit. Ammōnios ho Hermeiou, lit. "Ammonius, son of Hermias"; c. 435–c. 517 – c. 526) was a Greek philosopher from Alexandria in the eastern Roman empire during Late Antiquity. A Neoplatonist, he was the son of the philosophers Hermias and Aedesia, the brother of Heliodorus of Alexandria and the grandson of Syrianus. Ammonius was a pupil of Proclus in Roman Athens, and taught at Alexandria for most of his life, having obtained a public chair in the 470s.