In Greek mythology, Priapus or Priapos (Ancient Greek: Πρίαπος), was a minor rustic fertility god, protector of livestock, fruit plants, gardens and male genitalia. Priapus is marked by his absurdly oversized, permanent erection, which gave rise to the medical term priapism. He became a popular figure in Roman erotic art and Latin literature, and is the subject of the often humorously obscene collection of verse called the Priapeia.

Priapus was described as the son of Aphrodite by Dionysus, or the son of Dionysus and Chione, perhaps as the father or son of Hermes, and the son of Zeus or Pan, depending on the source. According to legend, Hera cursed him with impotence, ugliness and foul-mindedness while he was still in Aphrodite's womb, in revenge for the hero Paris having the temerity to judge Aphrodite more beautiful than Hera. The other gods refused to allow him to live on Mount Olympus and threw him down to Earth, leaving him on a hillside. He was eventually found by shepherds and was brought up by them.