French Citizenship by Descent

France transmits nationality by descent under Article 18 of the Civil Code with no fixed generational limit: if each ancestor in the chain was French when their child was born, French nationality passed all the way down. What defeats most distant-ancestor claims is not a generation count but Article 30-3, the fifty-year non-use rule.

If you and your French ancestors have lived outside France for more than fifty consecutive years, and during that period neither you nor your French parent held 'possession d'état de Français' — a French passport, a national ID card, consular registration, or other official recognition of French nationality — then nationality by filiation can no longer be claimed. It lapses through désuétude, non-use. The escape hatch: if any ancestor in the chain, including a grandparent, resided in France or held official French documents at any point within that fifty-year window, Article 30-3 does not apply and the claim survives.

Before the 1973 nationality reform, a French woman who married a foreigner very often lost her French nationality automatically. If your line runs through a female ancestor who married a non-French man before 1973, she may have ceased to be French at that moment — which breaks transmission to her children and everyone after. The 1973 reform ended this rule but is not retroactive to births before 1973, so the historical position governs older lineages.

You apply at the French consulate with jurisdiction over your country of residence — not your country of birth, and not the region your ancestor came from. Applying to the wrong post is a routine reason files go nowhere.

You need an acte de naissance for every generation from the French ancestor to you, an acte de mariage for each married couple in the chain, and proof of the ancestor's French nationality (a French birth certificate, an old French passport, or a naturalisation record). Non-French documents need an apostille and a translation by a traducteur assermenté — a court-sworn translator. Unofficial translations are rejected. French civil-registry documents can be requested for free from the Service Central d'État Civil (SCEC) in Nantes.

France has permitted dual citizenship since 9 January 1973. French nationals who acquire another nationality keep their French citizenship, and new French citizens are not asked to renounce anything — one of the most permissive positions in the EU.

There is no filing fee at the consulate. A three-generation claim usually costs €200 to €600 in translations and apostilles. Processing varies widely by post: major consulates such as New York, London, Los Angeles, and Sydney typically take 6 to 18 months after a complete file; smaller posts can be faster. With multi-generation document gathering on top, a realistic total is nine months to two years or more.