In Greek mythology, Iapetus (/aɪˈæpɪtəs/; Ancient Greek: Ἰαπετός, romanized: Iapetós),[also Japetus, was a Titan, the son of Uranus and Gaia and father of Atlas, Prometheus, Epimetheus, and Menoetius. He was also called the father of Buphagus and Anchiale in other sources.

Iapetus was linked to Japheth (יֶפֶת) one of the sons of Noah and a progenitor of mankind in biblical accounts. The practice by early historians and biblical scholars of identifying various historical nations and ethnic groups as descendants of Japheth, together with the similarity of their names, led to a fusion of their identities, from the early modern period to the present.