Hyperion, also known as Saturn VII (7), is the largest of Saturn's irregular, nonspherical moons. Considering its odd potato-shape, Hyperion is probably a remnant of a larger moon that was destroyed by a major impact. Hyperion has unexplained sponge-like appearance and it rotates chaotically, tumbling unpredictably through space as it orbits Saturn.

Hyperion was discovered by William Lassell in 1848. That same year William Cranch Bond, together with his son George Phillips Bond, independently discovered Hyperion. All three men are jointly credited with the discovery.