Which planet spins the fastest on its axis?

Jupiter rotates faster than any other planet in the Solar System, completing a turn in just under 10 hours. This rapid spin contributes to its noticeable equatorial bulge and powerful atmospheric bands. Jupiter’s fast rotation also helps generate its strong magnetic field. The planet is so large that even this quick spin still means a day there is much shorter than on Earth. Astronomers use its rotation as a key reference for studying gas giant dynamics.