Belgian Citizenship by Birth
â¢If one of the parents is Belgian;
â¢If the child is under 18 and adopted by a Belgian citizen;
â¢If the child is under 18 and is a stateless;
â¢If one of the parents or one of the adoptive parents is also born in Belgium and has had their principal residence in Belgium during 5 years in the course of 10 years preceding the birth of the child;
â¢If the child is under 12, one of the parents or one of the adoptive parents does a declaration asking for the Belgian nationality for the child on condition that they have their principal residence during 10 years preceding the declaration and on condition that one of the parents or the adoptive parents have an unlimited authorization to live in Belgium;
â¢If the child has reached 18 years old and resided in Belgium since birth;
â¢Declaration by option, if the person is (i) at least 18 years old and less than 22 years old, (ii) has had his principal residence during the 12 months preceding the declaration and (iii) has had his principal residence since his 14 years until his 18 years or for a period of 9 years. This last condition is not required if one of his parents or one of his adoptive parents was Belgian at the moment of the birth.