William Valentine (1862–1928) was an American educator and missionary.
William Valentine may also refer to:
Billy Valentine (born William Valentine, 1925), American musician William Valentine (painter) (1798–1849), Canadian daguerreotyper and portrait painter William Valentine (politician) (born 1971/1972), American politician William Valentine, American musician and member of The Valentine Brothers
See also William Valentine Black (1832–1927), American Mormon leader William Valentine Mayneord (1902–1988), British radiologist William Valentine Schevill (1864–1951), American painter William Valentine Wood (1883–1959), British businessman