John Stuart Hindmarsh (25 November 1907 – 6 September 1938) was an English racecar driver and aviator.

Hindmarsh was educated at Sherborne, Dorset and then attended the Royal Military College.

Hindmarsh was killed aged 30 while test flying Hawker Hurricane I L1652 at Brooklands on 6 September 1938; he is thought to have been overcome by carbon monoxide fumes in the cockpit, and the aeroplane then dived almost vertically into the ground and exploded at the foot of St George's Hill almost opposite the Vickers factory entrance.

Hindmarsh married the multiple record breaking racing driver Violette Cordery on 15 September 1931 at Stoke D'Abernon parish church, and they had two daughters, one of whom married the racing driver Roy Salvadori.

Widowed in 1938, Cordery retired from public life until her death on 30 December 1983 in Oxshott, Surrey.