uranus88How many moons does Uranus have? Uranus has 27 known moons. They stand out as the least massive moon system among those of the giant planets. For example,Uranus Observational Parameters Discoverer: William Herschel Discovery Date: 13 March 1781 Distance from Earth Minimum (10 6 km) 2580.6 Maximum (10 6 km) 3153.5