John Hewitt (23 December 1880 – 4 August 1961) was a South African zoologist and archaeologist of British origin.

He was born in Dronfield, Derbyshire, England, and died in Grahamstown, South Africa.

In 1909 he went to South Africa to work as an assistant curator at the Transvaal Museum in Pretoria.

Hewitt began investigating into Stone age sites[7] in the Grahamstown area of the Eastern Cape; there in collaboration with C. W. Wilmot he excavated a cave on the farm Wilton, and described the culture that has ever since been known as Wilton culture.

[9][10] Hewitt is honored in the specific name of a species of Bornean beetle, Cicindela hewittii[11] and of South African lizard, Goggia hewitti.