Lysippus was an Athenian comic poet active in the 5th century BCE, during the era of Old Comedy. He was a contemporary of the more famous playwright Aristophanes. According to the ancient Byzantine encyclopedia known as the Suda, Lysippus won a victory at the City Dionysia, the major Athenian dramatic festival, though the exact year of his victory is not recorded.

He is credited with writing two comedies. One had the title Bacchae, while the other remains unnamed. Both plays are now lost, and no fragments of their text are known to survive.

Lysippus is considered a minor figure in the history of Greek comedy. His primary significance lies in his attestation as a competitor and victor at the festivals, which helps modern scholars understand the breadth and competitive nature of comic theater in Classical Athens beyond the few authors whose works survive in full. His record contributes to the fragmentary picture of Old Comedy, illustrating the wider world of playwrights who participated in the genre.