In Greek mythology, Tethys was a Titan daughter of Uranus and Gaia, a sister and wife of the Titan Oceanus, and the mother of the river gods and the Oceanids. Hesiod lists her Titan siblings as Oceanus, Coeus, Crius, Hyperion, Iapetus, Theia, Rhea, Themis, Mnemosyne, Phoebe, and Cronus.

Although Tethys had no active role in Greek mythology and no established cults, she was depicted in mosaics decorating baths, pools, and triclinia in the Greek East, particularly in Antioch and its suburbs, either alone or with Oceanus. Her identifying attributes are wings sprouting from her forehead, a rudder/oar, and a ketos, a creature from Greek mythology with the head of a dragon and the body of a snake.

The only early story concerning Tethys is what Homer has Hera briefly relate in the Iliad’s Deception of Zeus passage. There, Hera says that when Zeus was in the process of deposing Cronus, she was given by her mother Rhea to Tethys and Oceanus for safekeeping and that they "lovingly nursed and cherished me in their halls". Hera relates this while dissembling that she is on her way to visit Oceanus and Tethys in the hopes of reconciling her foster parents, who are angry with each other and are no longer having sexual relations.

The only other story involving Tethys is an apparently late astral myth concerning the polar constellation Ursa Major (the Great Bear), which was thought to represent the catasterism of Callisto who was transformed into a bear and placed by Zeus among the stars. The myth explains why the constellation never sets below the horizon, saying that since Callisto had been Zeus's lover, she was forbidden by Tethys from "touching Ocean's deep" out of concern for her foster-child Hera, Zeus's jealous wife.

Claudian wrote that Tethys nursed two of her nephlings in her breast, Helios and Selene, the children of her siblings Hyperion and Theia, during their infancy, when their light was weak and had not yet grown into their older, more luminous selves.

In Ovid's Metamorphoses, Tethys turns Aesacus into a diving bird.

Tethys was sometimes confused with another sea goddess, the sea-nymph Thetis, wife of Peleus and mother of Achilles.

According to Hesiod, there were three thousand (i.e. innumerable) river gods. These included Achelous, the god of the Achelous River, the largest river in Greece, who gave his daughter in marriage to Alcmaeon and was defeated by Heracles in a wrestling contest for the right to marry Deianira; Alpheus, who fell in love with the nymph Arethusa and pursued her to Syracuse, where she was transformed into a spring by Artemis; and Scamander who fought on the side of the Trojans during the Trojan War and, offended when Achilles polluted his waters with a large number of Trojan corpses, overflowed his banks nearly drowning Achilles.

According to Hesiod, there were also three thousand Oceanids. These included Metis, Zeus' first wife, whom Zeus impregnated with Athena and then swallowed; Eurynome, Zeus' third wife, and mother of the Charites; Doris, the wife of Nereus and mother of the Nereids; Callirhoe, the wife of Chrysaor and mother of Geryon; Clymene, the wife of Iapetus, and mother of Atlas, Menoetius, Prometheus, and Epimetheus; Perseis, wife of Helios and mother of Circe and Aeetes; Idyia, wife of Aeetes and mother of Medea; and Styx, goddess of the river Styx, and the wife of Pallas and mother of Zelus, Nike, Kratos, and Bia.

All published appearances of from before January 1, )-(95)}} are public domain in the US.

* The Iliad
* Theogony
* The Homeric Hymns
* Prometheus Bound
* Seven Against Thebes
* Cratylus
* Theaetetus
* The Library
* Hymns
* Alexandra
* The Library of History
* Fall of Troy
* Dionysiaca
* Fabulae
* Astronomica
* Metamorphoses
* Fasti
* Georgics
* Hercules Furens
* Medea
* Phaedra
* Troades
* The Argonautica
* Thebaid
* Achilleid

* A possible correspondence between Oceanus and Tethys, and Apsū and Tiamat has been noticed by several authors, with Tethys' name possibly having been derived from that of Tiamat.
* Tethys, a moon of the planet Saturn, and the prehistoric Tethys Ocean are named after this goddess.

*[https://myths-in-media.fandom.com/wiki/Tethys Myths in Media Wiki]
*[https://en.wikipedia.org/wiki/Tethys_(mythology) Wikipedia]
*[https://www.theoi.com/Titan/TitanisTethys.html Theoi]
*[https://comicvine.gamespot.com/tethys/4005-12540/issues-cover/ ComicVine]
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