Iapetus (disambiguation)

Iapetus is a Titan in Greek mythology.

Iapetus may also refer to:
 * Iapetus (moon), one of the planet Saturn's moons, named for the mythological Titan
 * Iapetus Ocean, an ancient ocean between the paleocontinents Laurentia and Baltica
 * Iapetus suture, line of closure of the Iapetus Ocean