A minor-planet moon, also known as a planetary satellite or natural satellite, is an astronomical body that orbits a minor planet as its natural satellite. As of January 2021, there are 218 minor planets known to have moons.

The first confirmed discovery of a minor-planet moon was made in 1993 around 243 Ida by the Galileo spacecraft. The first unconfirmed claims were made in the 19th century for 8 Flora and 433 Eros. As of 2021, the largest known minor-planet moon is Charon, which orbits Pluto. The most massive known minor-planet moon is Dysnomia, which orbits Eris.