John Downes
John Downes may refer to:
- John Downes , English commissioner convicted of regicide of Charles I of England at the restoration of Charles II
- John Downes , English theatre prompter for most of the Restoration period, 1660–1700
- John Downes , 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 , British Olympic sailing gold medalist in 1908
- John Downes, Irish athlete at the 1996 IAAF World Cross Country Championships – Senior men's race
- John K. Downes, Canadian politician, member of the Legislative Assembly of Manitoba, 1922–1927
- John P. Downes, member of the Illinois House of Representatives
- Sean Downes, known as John, ex-PIRA member who died when he was shot in the chest with a plastic bullet during the Troubles