Captain Ahab is a fictional character and one of the protagonists in Herman Melville's Moby-Dick (1851). He is the monomaniacal captain of the whaling ship Pequod. On a previous voyage, the white whale Moby Dick bit off Ahab's leg, and he now wears a prosthetic leg made out of whalebone. The whaling voyage of the Pequod ends up as a hunt for revenge on the whale, as Ahab forces the crew members to support his fanatical mission. When Moby Dick is finally sighted, Ahab's hatred robs him of all caution, and the whale drags him to his death beneath the sea and sinks the Pequod.

Moby-Dick; or, The Whale is an 1851 novel by American writer Herman Melville. The book is the sailor Ishmael's narrative of the maniacal quest of Ahab, captain of the whaling ship Pequod, for vengeance against Moby Dick, the giant white sperm whale that bit off his leg on the ship's previous voyage. A contribution to the literature of the American Renaissance, Moby-Dick was published to mixed reviews, was a commercial failure, and was out of print at the time of the author's death in 1891. Its reputation as a Great American Novel was established only in the 20th century, after the 1919 centennial of its author's birth. William Faulkner said he wished he had written the book himself, and D. H. Lawrence called it "one of the strangest and most wonderful books in the world" and "the greatest book of the sea ever written". Its opening sentence, "Call me Ishmael", is among world literature's most famous.