List of round moons in the Solar system. Terrestrial System: * Moon - Jovian System: * Io - * Europa - * Ganymede - * Callisto - Saturnian System: * Mimas - * Enceladus - * Tethys - * Dione - * Rhea - * Titan - * Iapetus - Uranian System: * Miranda - * Ariel - * Umbriel - * Titania - * Oberon - Neptunian System: * Triton - Plutonian System: * Charon -