John Cooper (18 December 1940 – 3 March 1974) was a British athlete who competed mainly in the 400 metre hurdles. He competed for Great Britain in the 1964 Summer Olympics held in Tokyo, Japan in the 400 metre hurdles where he won the silver medal. He then joined with team mates Tim Graham, Adrian Metcalfe, and Robbie Brightwell in the 4 x 400 metres relay where they won the silver medal. Cooper also competed in the 400 metre hurdles at the 1968 Summer Olympics in Mexico serving as Great Britain's third-string athlete in this event, behind gold medallist David Hemery and bronze medallist John Sherwood.