In Greek mythology, Celaeno (/sɪˈliːnoʊ/; Ancient Greek: Κελαινώ Kelaino, lit. 'the dark one', also Celeno or Kelaino, sometimes [misspelled] Calaeno) referred to several different figures.

• Celaeno, one of the Pleiades. She was said to be mother of Lycus and Nycteus,^[1] of King Eurypylus (or Eurytus) of Cyrene, and of Lycaon, also by Poseidon^[2]
• Celaeno, one of the Harpies,^[3] whom Aeneas encountered at Strophades. She gave him prophecies of his coming journeys.^[4]
• Celaeno, one of the Danaïdes, the daughters of Danaus. Her mother was Crino. She married and killed Hyperbius, son of Aegyptus and Hephaestine.^[5] She was also believed to have had a son Celaenus by Poseidon.^[6]
• Celaeno, a Phocian princess as the daughter of King Hyamus of Hyampolis, son of Lycorus. Her mother was Melantheia (Melantho), daughter of Deucalion. Celaeno^[7] or her sister Melanis^[8] became the mother of Delphus by Apollo.
• Celaeno, daughter of Ergea by Poseidon.^[9] She was the mother of Lycus and Chimaereus by Prometheus.^[10]
• Celaeno, an Amazon. She was killed by Heracles whilst he was undertaking the ninth labour.^[11]

Astronomical objects

• Celaeno, a star in the constellation of Taurus.

In popular culture

• The harpy Celaeno appears as a captive of a traveling witch's Midnight Carnival, in the Peter S. Beagle classic fantasy novel The Last Unicorn and the 1982 film based on the book.
• Captain Celaeno is the name of the leader of a pirate crew of parrot-like creatures who help the ponies in My Little Pony: The Movie.
• Celaena Sardothien, the main character of the Throne of Glass series. Sarah J. Maas, the author has cited Celaeno as her inspiration for the name.
• The Celaeno Fragments are a series of occult writings (created by H. P. Lovecraft’s friend and contemporary August Derleth for his series The Trail of Cthulhu) ascribed to Dr Laban Shrewsbury, and written from memory after a series of visits to the Great Library of Celaeno, located in a star system in the Pleiades.