A moon of Saturn was discovered by the Cassini Imaging Team on October 24, 2004. Polydeuces also is designated as "Saturn XXXIV" and "S/2004 S5". In Greek mythology, Polydeuces, also known as Pollux, was the twin brother Castor

Polydeuces (pol'-ee-dew'-seez, , Greek Πολυδεύκης) is a very small natural satellite of Saturn that is co-orbital with Dione and librates around the trailing Lagrangian point (L5). Its diameter is estimated to be about 3.5 km..