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 under specific conditions. 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.
Since 2008, a Belgian citizen is allowed to hold two or even more nationalities without any special conditions.
Indeed, if a Belgian citizen acquires voluntarily or automatically a foreign nationality, he will no longer be required to give up Belgian nationality.
Moreover, if a person holds another nationality and obtains Belgian nationality, 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.