Tithonus is a figure in Greek mythology known for being granted immortality without eternal youth. Tithonus may also refer to: "Tithonus" (poem), a poem by Alfred, Lord Tennyson Tithonus poem, a mostly complete fragment of a poem by Saphho "Tithonus" (The X-Files), an episode of the TV series The X-Files 6998 Tithonus, a Trojan asteroid Tithonus Birdwing, Ornithoptera tithonus, a birdwing butterfly Tithonus, one of over 100 subgenera within the weevil genus Otiorhynchus See also Tithonos, son of Eos and Cephalus in Greek mythology Tithonian, the final stage of the Late Jurassic epoch Titon et l'Aurore, an opera by the French composer Jean-Joseph de Mondonville