William Crosby

William Crosby may refer to:


 * William G. Crosby (1805–1881), American politician and former Governor of Maine
 * William Holmes Crosby Jr. (1914–2005), doctor, inventor and poet, considered a founding fathers of modern hematology
 * William Otis Crosby (1850–1925), American geologist and engineer
 * Bill Crosby (politician) (born 1937), American politician in the South Carolina House of Representatives
 * William C. Crosby, American tennis player in U.S. Pro Tennis Championships draws, 1946–1967