Ammonius of Athens (; ), 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, and introduces him discoursing on religion and sacred rites. 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 within the treaty series 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 as the author of a book on altars and sacrifices (). Athenaeus also mentions a work on Athenian courtesans () as written by an Ammonius.