Werchter is a small village in Belgium which has been part of the municipality of Rotselaar since 1 January 1977.

The origin of the Werchter's name is unknown, but is thought to be related to water.

Each year, many renowned groups and artists perform at Rock Werchter, and over 320,000 people come to the festival.

Originally it was a double-festival, called "Rock Torhout-Werchter", with two festival areas on different places in Belgium: one in Werchter and one in Torhout.

There is also a "Rock Werchterroute", a cycling route, around Werchter and Leuven, which also organises an annual music festival which is among the most popular in Belgium, Marktrock.