Only one planet in our solar system has exactly one moon: Earth.

Quick Scoop

  • Mercury: 0 moons.
  • Venus: 0 moons.
  • Earth: 1 moon → the only planet with exactly one natural satellite.
  • Mars: 2 moons (Phobos and Deimos).
  • Jupiter, Saturn, Uranus, Neptune: each has many moons, not just one.

So if you are asking “how many planets in our solar system have only one moon?” the answer is: one planet – Earth.

Information gathered from public forums or data available on the internet and portrayed here.