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

Look up Tethys in Wiktionary, the free dictionary.

• Thetis (disambiguation)

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