William Whitney may refer to:
William Channing Whitney (1851–1945), American architect William Collins Whitney (1841–1904), American politician, financier, founder of the prominent Whitney family, US Secretary of the Navy William Dwight Whitney (1827–1894), American linguist, philologist, and lexicographer who edited The Century Dictionary William M. Whitney (1828–?), American politician, member of Illinois House of Representatives William Fiske Whitney (1850–1921), American anatomist, curator, and pathologist William G. Whitney (1840–1915), American Medal of Honor recipient William Payne Whitney (1876–1927), American businessman, philanthropist, racehorse breeder and owner
See also Bill Whitney (Willard Whitney), U.S. journalist William Witney (1915–2002), American director of serials and westerns sometimes billed as William Whitney