In Greek mythology, Orithyia or Oreithyia (/ɒrɪˈθaɪ.ə/;^[1] Ancient Greek: Ὠρείθυια, romanized: Ōreíthyia; Latin: Ōrīthyia; lit. 'mountain-raging' or 'mountain-rushing') was the name of the following women:

• Orithyia or Orythya,^[2] the Nereid of raging seas^[3] and one of the 50 marine-nymph daughters of the 'Old Man of the Sea' Nereus and the Oceanid Doris.^[4] She and her other sisters appear to Thetis when she cries out in sympathy for the grief of Achilles at the slaying of Patroclus.^[5]
• Orithyia, a daughter of Cecrops, wife of Makednos and mother of Europus.^[6][7]
• Orithyia, a daughter of Erechtheus, who was abducted by Boreas.^[8]
• Orithyia, a nymph, who was either the mother of Cinyras by Belus or the wife of Cinyras and mother of Smyrna/Myrrha (thus doublet of Cenchreis).^[9]
• Orithyia, queen of the Amazons.^[10]

• Antoninus Liberalis, The Metamorphoses of Antoninus Liberalis translated by Francis Celoria (Routledge 1992). Online version at the Topos Text Project.
• Apollodorus, The Library with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921. ISBN 0-674-99135-4. Online version at the Perseus Digital Library. Greek text available from the same website.
• Gaius Julius Hyginus, Fabulae from The Myths of Hyginus translated and edited by Mary Grant. University of Kansas Publications in Humanistic Studies. Online version at the Topos Text Project.
• Homer, The Iliad with an English Translation by A.T. Murray, Ph.D. in two volumes. Cambridge, MA., Harvard University Press; London, William Heinemann, Ltd. 1924. ISBN 978-0674995796. Online version at the Perseus Digital Library.
• Homer, Homeri Opera in five volumes. Oxford, Oxford University Press. 1920. ISBN 978-0198145318. Greek text available at the Perseus Digital Library.
• Stephanus of Byzantium, Stephani Byzantii Ethnicorum quae supersunt, edited by August Meineike (1790–1870), published 1849. A few entries from this important ancient handbook of place names have been translated by Brady Kiesling. Online version at the Topos Text Project.

This article includes a list of Greek mythological figures with the same or similar names. If an internal link for a specific Greek mythology article referred you to this page, you may wish to change the link to point directly to the intended Greek mythology article, if one exists.