Eriphus was an Athenian comic poet active in the 5th century BCE during the period known as Old Comedy. He is a very obscure figure, with no details of his personal life recorded. According to the ancient encyclopedia the Suda, he was a contemporary of the playwright Pherecrates and was victorious in comic competitions, though the specific festival is unknown.

He is credited with two comedies, both of which are lost and survive only as fragments and titles mentioned by later writers. The plays are Meliboea, named after a city or mythological figure, and Peltast, named after a type of light-armed soldier. These fragments are primarily preserved in the works of later grammarians who quoted them for their unusual words or phrases.

Eriphus holds a minor but historically significant place as one of the many comic poets whose work represents the transition from the political satire of Old Comedy to the more social themes of Middle Comedy. His extreme obscurity is typical of the vast number of ancient playwrights whose full works did not survive, yet who collectively shaped the development of Greek drama.