Capellen is a town in the commune of Mamer, in south-western Luxembourg, 12 km west of Luxembourg City. As of 2023, the town has a population of 2,371. Despite not having a commune named after it, Capellen lends its name to the canton of Capellen, and is the only town in Luxembourg to bear the latter distinction but not the former.

Mamer is a commune and town in south-western Luxembourg. It is located 7 km (4.3 mi) west of Luxembourg City. The commune includes both Mamer itself and the smaller communities of Capellen and Holzem. Mamer is situated on the river Mamer, a tributary of the Alzette. The A6 motorway from Luxembourg to Brussels, also designated European route E25, runs through Mamer.