Phaenias of Eresus (,
Phainias; also
Phanias) was a
Greek philosopher from
Lesbos, important as an immediate follower of and commentator on
Aristotle. He came to
Athens about 332 BCE, and joined his compatriot,
Theophrastus, in the
Peripatetic school. His writings on
logic and science appear to have been commentaries or supplements to the works of Aristotle and Theophrastus. He also wrote extensively on history. None of his works have survived.