Ornitholestes (meaning "bird robber") was a small theropod dinosaur of the late Jurassic of Western Laurasia (the area that was to become North America). To date, it is known only from a single partial skeleton, and badly crushed skull found at the Bone Cabin Quarry near Medicine Bow, Wyoming, in 1900. It was described by Henry Fairfield Osborn in 1903. An incomplete hand was later attributed to Ornitholestes, although it now appears to belong to Tanycolagreus. The type (and only known) species is O. hermanni. The species name honors the American Museum of Natural History preparator Adam Hermann.