How many planets in the solar system have rings? Four the planets in the solar system have rings. They are the four giant gas planets Jupiter, Saturn, Uranus and Neptune. Saturn, which has by far the largest ring system, was know to have rings for a long time. It was not until the 1970's that rings were discovered around the other gas planets. The rings around Jupiter, Uranus and Neptune are much smaller, darker and fainter than the rings of Saturn.