Pandion I was a king of Athens in Greek mythology, son of Erechtheus (also known as Erichthonius) and the naiad Praxithea. His wife was Zeuxippe, with whom he had four children; Erechtheus, Butes, Procne and Philomela.
According to a source, Pandion I waged a war against the king of Thebes Labdacus. To gain allies, he also gave the hand of his daughter Procne to Tereus, king of Thrace, for marriage. During Pandion I's reign, the Athenians were introduced to the worship of the goddess Demeter and the god Dionysus. The death of his daughters Procne and Philomele caused him insufferable grief, leading to his death.