Hermarchus or Hermarch, sometimes incorrectly written Hermachus, was an Epicurean philosopher. He was the disciple and successor of Epicurus as head of the school. None of his writings survives. He wrote works directed against Plato, Aristotle, and Empedocles. A fragment from his Against Empedocles, preserved by Porphyry, discusses the need for law in society. His views on the nature of the gods are quoted by Philodemus.
