William Whitney
William Whitney may refer to:
- William Channing Whitney, American architect
- William Collins Whitney, American politician, financier, founder of the prominent Whitney family, US Secretary of the Navy
- William Dwight Whitney, American linguist, philologist, and lexicographer who edited The Century Dictionary
- William M. Whitney, American politician, member of Illinois House of Representatives
- William Fiske Whitney, American anatomist, curator, and pathologist
- William G. Whitney, American Medal of Honor recipient
- William Payne Whitney, American businessman, philanthropist, racehorse breeder and owner