Piet Retief is a town situated in a timber growing region in Mpumalanga province, South Africa. It is located not far from the Swaziland border. The town was founded by the Voortrekkers in 1883 and named it after the Voortrekker leader, Piet Retief, who was killed by the Zulus under their King Dingane's orders after he tried to settle on their land.
In 1886 the inhabitants of the town declared the Klein Vrystaat (Little Free State), which contained a population of only 72. This Republic existed until 1891, when it was incorporated into the South African Republic.