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
See also Bill Cosby (born 1937), American comedian and actor