Grimbergen is a municipality in the province of Flemish Brabant, in the Flemish region of Belgium, 10 km (6.2 mi) north of the capital Brussels. The municipality comprises the towns of Beigem, Grimbergen, Humbeek, and Strombeek-Bever. In 2017, Grimbergen had a total population of 37,030. The total area is 38.61 km2 (14.91 sq mi), which gives a population density of 959/km2 (2,480/sq mi).

Grimbergen is the brand name of a variety of Belgian abbey beers. Originally made by Norbertine monks in the Belgian town of Grimbergen, it is now brewed by different breweries in Belgium, France, Poland and Italy.