Piet Retief, officially eMkhondo, is a town situated in a timber-growing region in Mpumalanga province, South Africa.

In 1886, the inhabitants of the town declared the Klein Vrystaat (Little Free State), which contained a population of only 72.

Its main tourist attraction is the Dutch Reformed Church that was designed by the architect Gerard Moerdijk and built in 1921.

Its main economic activities are timber, paper and wattle bark production as well as mica, kaolin and iron mining.

On 2 February 2010, South African Arts and Culture minister Lulu Xingwana approved a state decision for Piet Retief to be renamed to eMkhondo.