Ammonius of Athens (/əˈmoʊniəs/; Greek: Ἀμμώνιος), sometimes called Ammonius the Peripatetic, was a philosopher who taught in Athens in the 1st century AD. He was a teacher of Plutarch, who praises his great learning,^[1] and introduces him discoursing on religion and sacred rites.^[2] Plutarch wrote a biography of him, which is no longer extant, and also mentioned Ammonius master in other works like the De E apud Delphos^[3][4] within the collection of treatises known as Moralia. From the information supplied by Plutarch, Ammonius was clearly an expert in the works of Aristotle, but he may have nevertheless been a Platonist philosopher rather than a Peripatetic.

He may be the Ammonius of Lamprae (in Attica) quoted by Athenaeus^[5] as the author of a book on altars and sacrifices (Greek: Περὶ βωμῶν καὶ Θυσιῶν). Athenaeus also mentions a work on Athenian courtesans (Greek: Περὶ τῶν Ἀθηνσινῆ Ἑταιρίδων) as written by an Ammonius.^[6]