Belgian Citizenship by Descent

Summary

Belgium recognizes citizenship by descent under the Code de la nationalité belge (CNB), but it is much narrower than many people expect. The central question is usually whether one of your parents was Belgian when you were born.

For people born after 1 January 1985, Belgium generally treats a child as Belgian if the child was born in Belgium to a Belgian parent. If the child was born abroad, the next question is where the Belgian parent was born. A Belgian parent born in Belgium usually passes Belgian nationality automatically. The same can apply if the Belgian parent was born in Belgian Congo before 30 June 1960, or in Rwanda or Burundi before 1 July 1962.

If both the child and the Belgian parent were born abroad, the Belgian parent generally had to make a declaration of attribution before the child's fifth birthday. A narrow exception can apply where no attribution declaration was made but the child did not receive another nationality before turning 18.

The age-28 rule (Art. 22 CNB). A Belgian born abroad after 1 January 1967 who also has another nationality can lose Belgian nationality on their 28th birthday unless an exception applies. The safest route is a declaration of retention before age 28. In some cases, receiving a Belgian passport or ID card between ages 18 and 28 can also prevent loss, depending on the timing of the case.

The pre-1985 rules are different. A child born before 1985 may qualify through a Belgian father if the parents were married. If the parents were not married, the older rule can turn on whether the first parent who legally recognized the child was Belgian. Maternal-line cases from this period can be more fact-specific and may need a separate administrative review.

Recent court note. In April 2026, Belgium's Constitutional Court held that the five-year attribution rule was unconstitutional in a narrow situation where the Belgian parent, who was also born abroad, died within five years of the child's birth before making the declaration. That is an edge case for legal review, not the normal pathway rule.

On the favorable side:

• Dual citizenship has been fully permitted since 2008 (CNB amendments). No renunciation is required at any stage.
• Applications are administrative (usually handled through a Belgian embassy, consulate, or commune), not judicial.

Once recognized, the applicant is an EU and Schengen citizen.

Eligibility

• A Belgian parent who was Belgian when you were born
• If you were born in Belgium, proof that one parent was Belgian at your birth
• If you were born abroad, proof that the Belgian parent was born in Belgium, Belgian Congo before 30 June 1960, Rwanda before 1 July 1962, or Burundi before 1 July 1962
• If both you and the Belgian parent were born abroad, an attribution declaration before your fifth birthday, unless the narrow no-other-nationality-before-18 exception applies
• For births before 1985, proof that the older father or acknowledgment rules are satisfied where they apply
• If you or your Belgian parent were Belgian and born abroad after 1 January 1967, proof that the age-28 retention rule did not cause a later loss of nationality
• A documented parent-child chain proving the Belgian parent relationship and any required declaration or retention facts
• Apostilled and officially translated civil records where required
• No language requirement for descent recognition
• No residency requirement in Belgium
• Dual citizenship is permitted (including U.S./Belgian) — no renunciation

What This Route Allows

This route can help confirm or document citizenship in Belgium when the citizenship-creating facts named above are proven. For many people in this category, the main work is evidence: civil records, family-link records, prior citizenship records, and any registration or restoration paperwork needed to show the claim.

What This Route Is Not

This is not a shortcut around documentation. Even when the citizenship claim is based on a right, you still need records that prove each required fact and family link.

Next Steps

1. Confirm your parent was Belgian when you were born. A Belgian grandparent helps only if your parent actually became or remained Belgian before passing nationality to you.
2. Confirm where you were born. If you were born in Belgium to a Belgian parent, that can be enough for descent-based attribution.
3. If you were born abroad, check where your Belgian parent was born. Belgium, Belgian Congo before 30 June 1960, Rwanda before 1 July 1962, or Burundi before 1 July 1962 can be enough.
4. If both you and the Belgian parent were born abroad, look for a declaration of attribution made before your fifth birthday. If none was made, check whether the no-other-nationality-before-18 exception could apply.
5. Audit the age-28 rule. If you or your Belgian parent were Belgian, born abroad after 1 January 1967, and also held another citizenship, confirm whether Belgian nationality was retained before age 28.
6. Audit the chain for the pre-1985 paternal-line issue — maternal transmissions pre-1985 may need a corrective declaration to be recognized.
7. Research Belgian records — communes and the Belgian State Archives (Archives de l'État / Rijksarchief) hold civil records and older parish records.
8. Gather vital records from your country of residence — certified long-form birth, marriage, and death certificates needed to prove the parent-child chain.
9. Apostille each civil record under the 1961 Hague Convention (or use your country's legalization procedure).
10. Obtain certified Dutch, French, or German translations where required.
11. Contact the Belgian embassy, consulate, or commune with jurisdiction over your file to confirm the exact recognition or registration process.
12. Once recognized or registered, apply for a Belgian passport.

Sources

• Belgian Ministry of Foreign Affairs — Nationality
• Belgian Ministry of Foreign Affairs — Being granted Belgian nationality before age 18
• FPS Justice — Declaration of attribution for minors
• Belgian Foreign Affairs — Retaining Belgian nationality
• Belgian Constitutional Court — Judgment 51/2026 listing
• Code de la nationalité belge (CNB) — official consolidated version
• Embassy of Belgium in Washington, D.C.
• Archives de l'État en Belgique / Rijksarchief
• Apostille Convention (HCCH) — U.S. competent authorities