Wolmaransstad is a maize-farming town situated on the N12 between Johannesburg and Kimberley in North West Province of South Africa. The town lies in an important alluvial diamond-mining area and it is the main town of the Maquassi Hills Local Municipality.
It was laid out on the farms Rooderand and Vlakfontein in 1888, and proclaimed a town in 1891. Named after Jacobus M A Wolmarans, then member of the Executive Council.
Wolmaransstad serves a large community and is an important diamond buying centre.