Capellen is a town located in the commune of Mamer in south-western Luxembourg. It is situated approximately 12 km west of the capital city, Luxembourg City.
As of 2025, Capellen has a population of 2,509 residents. While it does not have a commune named after it, the town provides its name to the canton of Capellen. It is notably the only town in Luxembourg that bears this distinction without having a corresponding commune of the same name.