John Dean (born 1938) was U.S. White House Counsel to President Nixon.
John Dean may also refer to:
- John Dean (convict) (c. 1620–1629), youngest person executed in the history of England
- John Dean (Pennsylvania judge) (1835–1905), Pennsylvania Supreme Court justice from 1892 to 1905
- John Dean (tenor) (1897–1990), English singer and actor
- John Dean (cyclist) (born 1947), New Zealand Olympic cyclist
- John Dean (footballer) (born 1956), Australian rules footballer
- John Gunther Dean (1926–2019), U.S. diplomat
- John M. Dean (1852–1909), Texas state senator from El Paso County, 1892–1896, see Texas Senate, District 25
- John F. Dean (born 1946), U.S. Tax Court judge
- Jono Dean (born 1984), Australian cricketer
- Johnno Dean, character in long running UK drama series Hollyoaks
- John Dean, sole British survivor of the sinking of the Sussex East Indiaman, at Bassas da India in 1738
- John S. Dean, author of Murder Most Foul (1947) in his capacity of chair of the Pedestrians Association (UK).
- John Dean (Massachusetts politician), representative to the Great and General Court
- Sean O'Mahony (journalist) (1932–2020), British music writer and magazine editor, who wrote under the name Johnny Dean
- Johnny Dean (born 1971), British musician
- John Wooster Dean (1874–1950), American actor better known as Jack Dean