In Greek mythology, Electra (Ancient Greek: Ἠλέκτρα, romanized: Ēléktra) was one of the three thousand Oceanids, water-nymph daughters of the Titans Oceanus and Tethys. By the sea-god Thaumas she bore Iris, the rainbow messenger, and the Harpies. She is distinct from Electra the Pleiad and from Electra, daughter of Agamemnon.

According to Hesiod, she was the wife of Thaumas, and by him, the mother of Iris, the goddess of rainbows and a messenger for the gods, and the Harpies.

The names of Electra's Harpy daughters vary. Hesiod and Apollodorus named them Aello and Ocypete. Virgil named Celaeno as one of the Harpies. Hyginus's Fabulae describes the Harpies — whom it lists as Celaeno, Ocypete, and Podarce — as daughters of Thaumas and Electra. Later, however, the Harpies are named Aellopous, Celaeno, and Ocypete, and are said to be the daughters of Thaumas and Ozomene, a figure not known elsewhere under that name.

The late 4th-early 5th century poet Nonnus gives Electra and Thaumas two children: Iris, and the river god Hydaspes.

Along with her sisters, Electra was one of the companions of Persephone when the daughter of Demeter was abducted by Hades.

This atlas entry (electra-oceanid) is the Oceanid wife of Thaumas and mother of Iris and the Harpies. Distinct from Electra the Pleiad (electra-pleiad / electra-atlas) and from Electra daughter of Agamemnon (electra).