Citizenship at birth through a Belgian parent

No unconditional jus soli, but two statutory birth-in-Belgium routes exist: a child born in Belgium who would otherwise be stateless before eighteen is Belgian (article 10), and the second-generation double jus soli of article 11 makes a child Belgian where a parent was also born in Belgium and resided five of the ten years before the birth.

Sources: Code de la nationalite belge, consolidated (Justel, Moniteur belge)

Belgian nationality through a Belgian parent

A child born in Belgium to a Belgian parent is Belgian automatically (article 8 s.1 1). Born abroad, the child is Belgian only if the Belgian parent was themselves born in Belgium, or the parent declares within five years of the birth.

Sources: Code de la nationalite belge, consolidated (Justel, Moniteur belge)

Nationality declaration after five years residence

The main route is the declaration de nationalite under article 12bis: an entitlement, not a discretionary grant, after five years of legal main residence with language (A2) and social and economic participation. A ten-year track needs only language and participation in the host community, and the spouse of a Belgian may declare after five years residence and three years of marriage. Parliamentary naturalisation (article 19) survives only as an exceptional-merit track.

estimated, not read from law — Read against the consolidated Code de la nationalite belge on Justel (updated to 18-02-2026). The previous record modelled this as discretionary naturalisation; article 12bis is a declaration of right when conditions are met, which materially changes how the route should be planned around.

Sources: Code de la nationalite belge, consolidated (Justel, Moniteur belge)