Jason (; Iáson) was an ancient Greek mythological hero who was famous for his role as the leader of the Argonauts and their quest for the Golden Fleece. He was the son of Aeson, the rightful king of Iolcos. He was married to the sorceress Medea. Because he belongs to mythology, he may have existed before the Greek Dark Ages (1100–800 BC.) The people who wrote about Jason lived around 300 BC.

Jason is a hero of Greek mythology who led the Argonauts and married Medea.