Citizenship in Belgium is regulated under the Code of Belgian Nationality of June 1984. The Belgian law provides that citizenship is in general granted under the ius sanguinis principle and also on the basis of birth for second generation residents. Other residents can obtain citizenship by a “declaration of nationality” when fulfilling conditions of duration of residence and integration or by “naturalisation” in case of special merits. The Code also establishes the conditions and modes under which foreigners residing in Belgium can obtain citizenship by naturalisation.
In the case of dual citizenship, since 2008, Belgian law does not require the registration or renunciation of the original citizenship, and there are no consequences in relation to any of these conditions. Therefore a Belgian citizen is allowed to hold dual citizenship without any special conditions.