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.

The Grand Ducal Police is the national police force of the Grand Duchy of Luxembourg. The police is under the control of the Minister for the Interior of Luxembourg, although they operate in the name, and under the ultimate control, of the Grand Duke of Luxembourg. Day-to-day executive control is exercised by the Director-General of the Grand Ducal Police. The Grand Ducal Police has existed in its current form since 1 January 2000, when the Grand Ducal Gendarmerie was merged with the police service.