Tethys
# Tethys

Tethys or Tethis may refer to:

* Tethys (database), an online knowledge management system about the environmental effects of offshore renewable energy
* Tethys (gastropod), genus of gastropods in the family Tethydidae
* Tethys (moon), a natural satellite of Saturn
* Tethys (mythology), a Titaness in Greek mythology
* Thetys (salp), a genus of gelatinous sea salp
* Tethys Ocean, a Mesozoic-era ocean between the continents of Gondwana and Laurasia
* Tethys Research Institute, a non-governmental scientific organisation based in Italy
* "Tethys", a song from The Ocean of the Sky by The Used
* Tethys, the Japanese name for "Thetis", a boss character in Mega Man ZX Advent
* Tethys River, an interplanetary waterway in Dan Simmons's Hyperion Cantos
