- a Titan, a daughter of Uranus and Gaia, the wife of Oceanus and mother of the Oceanids and river gods.
- one of the moons of Saturn.
- the Mesozoic ocean or seaway of which the Mediterranean Sea is a greatly shrunken remnant.
- a Titaness and sea goddess, wife of Oceanus
- a large satellite of the planet Saturn
- the sea that lay between Laurasia and Gondwanaland, the two supercontinents formed by the first split of the larger supercontinent Pangaea. The Tethys Sea can be regarded as the predecessor of today's smaller Mediterranean
