William Michael Crowley (April 18, 1857 – July 14, 1891) was an American Major League Baseball player who played mainly as an outfielder from 1875 to 1885. He played for the Philadelphia White Stockings, Louisville Grays, Buffalo Bisons, Boston Red Caps/Beaneaters, Philadelphia Athletics, and Cleveland Blues. Crowley threw out four men from the outfield during a May 1880 game with the Buffalo Bisons, and he did it again in August of that year.