Luxembourgish citizenship is mainly based on the ius sanguinis principle, however it can also be acquired through marriage, adoption or naturalisation. A child born to at least one Luxembourg parent is thus automatically a Luxembourger citizen, even if born abroad. In order to acquire Luxembourgish nationality by naturalisation one needs to show evidence of residence of at least five years, including a one year continuous residence period before submitting the citizenship application. In addition, one also needs to sit for a language test.
According to the Luxembourg Nationality Law of October 2008, which came into force on the 1 January 2009 any citizen of Luxembourg is allowed to hold dual or multiple citizenship. In Luxembourg there are no consequences in relation to the registration or renunciation of original citizenship and dual citizenship is allowed without any special conditions.