John Gladwin (born 7 May 1963) is an English former middle-distance runner and athletics administrator.
Gladwin won a silver medal representing England in the 1500 metres at the 1986 Commonwealth Games in Edinburgh, Scotland. He also won the 800 metres (1987) and 1500 metres (1983) titles at the UK Championships and the 1500 metres at the 1986 AAA Championships.
His track mile time of 3:51.02 is the 9th fastest of all time by a British athlete.
In 2019 Gladwin was elected president of Belgrave Harriers, the club he competed for as an athlete. He still holds Belgrave club records in the 800m, 1,000m, 1500m and the mile.