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 were closely associated with the Titan gods (such as Calypso, Clymene, Asia, Electra) 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.