Wolmaransstad (Afrikaans for "Wolmarans City") 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.

Town 245 km south-west of Johannesburg and 56 km north-east of Bloemhof. 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 originated in 1891 on the banks of the Makwasi River (San word for a type of wild spearmint) and takes its name from J. M. A. Wolmarans, a volksraad councilman.

Wolmaransstad serves a large community and is an important diamond buying center.

The Dutch Reformed church building was designed by Gerard Moerdijk.

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• Broadbent Mission Station
• Digger's Diamond route
• Makwassierante Conservation Area
• Wolwespruit Dam Nature Reserve

• Bernardus Gerhardus Fourie (also known as Brand Fourie; 1916–2008), South African politician

• Wolmaransstad Commando, a former light infantry regiment of the South African Army based in Wolmaransstad