John Whittaker may refer to:John Whittaker, British MEP John Edmondson Whittaker (1897–1945), British Member of Parliament John Macnaghten Whittaker (1905–1984), British mathematician and university administrator John Whittaker (businessman), British billionaire John Whittaker (1950–2020), New Zealand rugby league player John William Whittaker, Anglican clergyman John C. Whittaker, American archaeologist John S. Whittaker, Justice of the Louisiana Supreme Court