Hermias (/hɜːrˈmaɪəs/; Greek: Ἑρμείας Hermeias) was a Neoplatonist philosopher who was born in Alexandria c. 410 AD. He went to Athens and studied philosophy under Syrianus. He married Aedesia, who was a relative of Syrianus, and who had originally been betrothed to Proclus, but Proclus broke the engagement off after receiving a divine warning. Hermias brought Syrianus' teachings back to Alexandria, where he lectured in the school of Horapollo, receiving an income from the state. He died c. 450 AD^{[citation needed]} (but before 470 AD),^[1] at a time when his children, Ammonius and Heliodorus, were still small. Aedesia, however, continued to receive an income from the state, in order to raise the children, enabling them to become philosophers.

A Commentary on the Phaedrus written by Hermias survives.^[2] It consists of notes based on the lectures conducted by Syrianus concerning Plato's Phaedrus.