Zellik is an urbanised town located in the municipality of Asse within the province of Flemish Brabant, Belgium. It serves as a suburb situated on the northwest edge of Brussels.
The town has a population of over 8,000 inhabitants. Geographically, it is separated from the rest of the Brussels agglomeration by the R0 ring road and sits in close proximity to the municipalities of Jette, Ganshoren, and Sint-Agatha-Berchem to its east.