In Greek mythology and, later, Roman mythology, the Oceanids (/, /; Ancient Greek: Ὠκεανίδες, pl. of Ὠκεανίς) are sea nymphs who were the three thousand daughters of the Titans Oceanus and Tethys. Each was the patroness of a particular spring, river, sea, lake, pond, pasture, flower or cloud. Some of them, such as Calypso, Clymene, Asia, Electra/Ozomene, were closely associated with the Titan gods or personified abstract concepts (Tyche, Peitho).
Oceanus and Tethys also had 3,000 sons, the river-gods Potamoi (Ποταμοί, "rivers"). Whereas most sources limit the term Oceanids or Oceanides to the daughters, others include both the sons and daughters under this term.