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