Trompsburg is a town in the Free State province of South Africa off the N1 highway, the major road connection between Johannesburg and Cape Town.

The town is 120 km south-west of Bloemfontein and 56 km north-east of Philippolis.

It was laid out in 1891 on the farm Middelwater and attained municipal status in 1902.

Named after the owners of the farm, Jan and Bastiaan Tromp.

[3]: 352  It was at first called Jagersfontein Road, then Hamilton, in honour of Sir Hamilton John Goold-Adams (1858–1920), Lieutenant-Governor of the Orange River Colony from 1901 to 1910.