The Circuit Zolder, also known as Circuit Terlamen, is an undulating 4.011 km (2.492 mi) motorsport race track in Heusden-Zolder, Belgium.

Heusden-Zolder is a municipality located in the Belgian province of Limburg near Hasselt. On 1 January 2006 Heusden-Zolder had a total population of 30,769. The total area is 53.23 km² which gives a population density of 578 inhabitants per km².