William Whitney or William Witney 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 Payne Whitney (1876-1927), American businessman, philanthropist, racehorse breeder and owner
- William Witney (1915-2002), American director of serials and westerns sometimes billed as William Whitney
- Bill Whitney, U.S. journalist