John Downes

John Downes may refer to:


 * John Downes (regicide) (1609–c. 1666), English commissioner convicted of regicide of Charles I of England at the restoration of Charles II
 * John Downes (prompter) (died c. 1712), English theatre prompter for most of the Restoration period, 1660–1700
 * John Downes (naval officer) (1786–1854), American Commodore and ship captain in the United States Navy
 * John Downes, Rear admiral in the United States Navy during World War II
 * John Downes (sailor) (1870–1943), British Olympic sailing gold medalist in 1908
 * John Downes (runner), Irish athlete at the 1996 IAAF World Cross Country Championships – Senior men's race
 * John K. Downes (1879–1944), Canadian politician, member of the Legislative Assembly of Manitoba, 1922–1927
 * Sean "John" Downes (1962–1984), ex-PIRA member who died when he was shot in the chest with a plastic bullet during the Troubles