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Tethys III was the third planet in the Tethys planetary system. The planet was a hydrogen-helium gas giant with a frozen helium core. This obscure world was located several hundred light years away from the Ngame Nebula.

In 2367, the crew of the USS Enterprise-D used the planet as a basis for concealing the Paxan homeworld in a T-Tauri type star system near the nebula. (TNG: "Clues")

"Tethys" was the daughter of the Greek gods Uranus and Gaia, and was the eponym of one of Saturn's moons.

Tethys III