In Greek mythology, Tiasa (Ancient Greek: Τίασα) was a Naiad nymph of a river near Amyclae, Sparta. She was a Laconian princess as the daughter of King Eurotas and thus, sister to Sparta. By the river Tiasa was situated a temple of Cleta and Phaenna, the two Charites recognized in Sparta, which was purported to have been founded by Lacedaemon.
- Athenaeus of Naucratis, The Deipnosophists or Banquet of the Learned. London. Henry G. Bohn, York Street, Covent Garden. 1854. Online version at the Perseus Digital Library.
- Athenaeus of Naucratis, Deipnosophistae. Kaibel. In Aedibus B.G. Teubneri. Lipsiae. 1887. Greek text available at the Perseus Digital Library.
- Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. ISBN 0-674-99328-4. Online version at the Perseus Digital Library
- Pausanias, Graeciae Descriptio. 3 vols. Leipzig, Teubner. 1903. Greek text available at the Perseus Digital Library.