Samuel Washington Woodhouse (June 27, 1821 – October 23, 1904) was an American surgeon, explorer and naturalist. Woodhouse was doctor and naturalist on the Sitgreaves Expedition led by Captain Lorenzo Sitgreaves from San Antonio to San Diego which explored the possibility of a route from the Zuni River to the Pacific. He was the author of A Naturalist in Indian Territory: The Journal of S. W. Woodhouse, 1849-50. Woodhouse's toad (Anaxyrus woodhousii) and Woodhouse's scrub jay (Aphelocoma woodhouseii) were named in his honor. The first Cassin's sparrow was described in 1852 by Samuel W. Woodhouse from a specimen collected near San Antonio, Texas. Dr. Woodhouse gave it its species name in honor of John Cassin, a Philadelphia ornithologist.