Bilzen is a town and a municipality located in the Belgian province of Limburg.
On January 1, 2006, Bilzen had a total population of 30,057. The total area is 75.90 km² which gives a population density of 396 inhabitants per km².
Bilzen consists of the city of Bilzen and the following villages: Beverst, Eigenbilzen, Grote-Spouwen, Hees, Hoelbeek, Kleine-Spouwen, Martenslinde, Mopertingen, Munsterbilzen, Rijkhoven, Rosmeer, and Waltwilder. It was in 1977 that they all became part of the municipality Bilzen because of the fusion of municipalities.
Cities in Bilzen's neighbourhood are all within a distance of some 10 to 15 kilometers: to its north, Genk; to its east, Maastricht; to its south Tongeren; and to its north-west, Diepenbeek.
From 1965 to 1981 Bilzen hosted Jazz Bilzen, a jazz and rock festival that lasted several days. In its time Jazz Bilzen was the most important Belgian festival. Artists that performed there were, among many others, Humble Pie, The Moody Blues, Deep Purple, Black Sabbath, Humble Pie, The Kinks, The Troggs, Procol Harum, Golden Earring, Rod Stewart, Status Quo, Lou Reed, Aerosmith, AC/DC, The Cure, Toots Thielemans, Keith Jarrett and John McLaughlin.