Each Oceanid was the patroness of a particular source of fresh water, both heavenly (rain, moist breezes) and earthly (rivers, seas, springs). The Oceanids were also responsible for keeping watch over the young. According to Hesiod, who described them as "neat-ankled daughters of Ocean ... children who are glorious among goddesses", they are "a holy company of daughters who with the lord Apollo and the Rivers have youths in their keeping—to this charge Zeus appointed them" Like Metis, the Oceanids also functioned as the wives (or lovers) of many gods, and the mothers, by these gods, of many other gods and goddesses
Their brothers are the three thousand river gods known as Potamoi.
The following are some of the most famous or important of the three thousand daughters of Oceanus and Tethys.
- Styx: Elder Oceanid, Titaness of River Styx & Oaths, Consort of Pallas and Mother of the Winged Forces.
- Klymene: Titaness of Fame and Renown. Consort of Iapetus and Mother of the Human Foibles.
- Dione: Titaness of the Oracle of Dodona.
- Electra: Titaness of Storm-Clouds Colored by the Sun. Consort of Thaumas and Mother of Iris.
- Metis: Titaness of Wisdom and Good Council. Zeus' first wife and mother of Athena.
- Eurynome: Titaness of Water-Meadows. Mother of the Charites through Zeus.
- Doris: Titaness of Rich Fishing-Grounds. Consort of Nereus and Mother of the fifty Nereids.
- Periboea: Titaness of Pasturelands and Small-Streams. Consort of Lelantos.
- Pleione: Titaness of Plenty and Protectress of Sailing. Mother of the Pleiades.
- Callirhoe: Consort of Chrysaor and Mother of Geryon.
- Perseis: Mother of Aeetes through Helios.
- Eidyia or Idyia: Consort of Aeetes and Mother of Medea.
- Hagno: One of the nymphs that nursed infant Zeus.
- Hesione: Titaness of Foresight. Consort of Prometheus.
- Leuke: Known for her beauty, she was abducted by Hades, who turned her into Poplar tree.
- Peitho: Personification of Persuasion. Consort of Hermes.
- Certain children of other Titans are sometimes called a certain name after their father, like: Koeides (Asteria, Leto and Lelantos), Kreionides (Pallas, Astraeus and Perses). Hyperionides (Helios, Selene and Eos), Iapetionides (Atlas, Prometheus, Epimetheus and Menoetius).
- Though most Oceanids are Titanesses, some of them are Nymphs Aurai.
- Whereas most sources limit the term Oceanids or Oceanides to the daughters, others include both the sons and daughters under this term.
- According to some myths, Perseis was the mother of Circe.
- According to some myths, Nemesis and Tyche were Oceanids.
- According to some myths, Dione was the mother of Aphrodite and a wife of Zeus. In this version, she is the daughter of Aither and Gaea.
- In other myths, Peitho was a daughter of Aphrodite and has even been considered a daughter of Dionysus and one of the Charites.