This page is on the Greek goddess. For the proposed lunar orbiter, see SELENE.

In Greek mythology, Selene (Σελήνη, "moon") (Roman equivalent: Luna) was an ancient lunar goddess, daughter of Hyperion and Theia. She was eventually largely supplanted by Artemis. Though she was usually a daughter of Hyperion and Theia, Selene was occasionally described as a daughter of Zeus, or of Pallas in the Homeric Hymn to Hermes. where she is "bright Selene, daughter of the lord Pallas, Megamedes' son." Helios is more often her brother. She has a sister, Eos, goddess of the dawn.

She loved a handsome shepherd (or, more rarely, a king or a hunter) named Endymion from Asia Minor. He was so beautiful that Selene asked Zeus to grant him eternal life so he would never leave her. Alternatively, Endymion made the decision to live forever in sleep. Either way, Zeus blessed him by putting him into an eternal sleep. Every night, Selene visited him where he was buried on Mt. Latmus near Milete, in Asia Minor. Selene and Endymion had fifty daughters including Naxos.

Though the story of Endymion is best known today, Selene also had three daughters with Zeus (including Pandia) and, according to the some sources, the Nemean Lion as well. She also had an affair with Pan, who gave her a herd of white oxen.

In art, Selene was depicted as a beautiful woman with a pale face, riding a silver chariot pulled by two horses. Often, she was shown riding a horse or bull, wearing robes and a half-moon on her head and carrying a torch.

After her brother, Helios, the sun, finished his journey across the sky, Selene began hers as night fell upon the earth.

In Rome, Luna ("moon") had a temple on the Aventine Hill. It was built in the 6th century BC but destroyed in the fire under Nero.

In the collection known as the Homeric hymns there is a Hymn to Selene Selene is described in Apollodorus 1.2.2; Hesiod's Theogony 371; Nonnius 48.581; Pausanias 5.1.4; and Strabo 14.1.6, among others.

The name is the root of selenology, the study of the moon that corresponds to geology. The name appears in fiction as the character Adam Selene in the novel The Moon is a Harsh Mistress by Robert A. Heinlein.

The chemical element Selenium was named after Selene.