French naturalisation dual citizenship involves two separate legal questions. France permits a person acquiring French nationality to hold one or more other nationalities, but France cannot guarantee that another country will continue to recognise that person as its national. Your answer therefore depends on both French law and the nationality law of every other country involved.

The most dangerous mistake is treating the French declaration “I wish to retain this nationality” as permission from the other country. It records an intention reported to France; it is not a foreign nationality ruling.

Key takeaways

• France does not normally require renunciation. A person becoming French by naturalisation or declaration is not required by France to abandon an original nationality.
• You must disclose the relevant nationalities. French law requires a person acquiring French nationality by public decision or declaration to indicate the nationalities already held, those being retained and those the person intends to renounce.
• The other country still controls its nationality. Check whether it imposes automatic loss, prior permission, a notification deadline or exceptions tied to age, residence or how the nationality was acquired.
• Translation follows the legal check. If a foreign-language nationality certificate, retention approval, notification receipt or loss decision is submitted in a French nationality file, it must normally be accompanied by an accepted French translation. The relevant French terms are traduction assermentée and traducteur agréé.

Who this guide is for

This guide is for applicants across France, as well as applicants using a French consulate abroad, who are acquiring French nationality by naturalisation, reintegration or an eligible declaration route and need to determine whether they will legally keep an existing nationality.

It is particularly relevant if you acquired your present nationality by birth, descent, marriage, adoption or an earlier naturalisation; if you hold two or more current or expired passports; or if your country has automatic-loss, prior-authorisation or post-acquisition notification rules.

A typical document set includes current and former passports, a national identity card, a full birth certificate, parents’ civil-status or nationality records, marriage or divorce documents, a name-change decision and, where applicable, a nationality certificate, retention approval, notification receipt or loss decision. The records may be issued in Arabic, English, Portuguese, Spanish, Turkish, Russian, Ukrainian, Chinese or another language and may need translation into French.

The recurring difficulty is not simply translating a passport. It is identifying every nationality the applicant legally holds, finding the rule in force on the correct date, and keeping names, parent details and nationality history consistent across the French file.

Why this is a France-wide guide: the French declaration rule and translation standard are national. A prefecture or regional naturalisation platform does not create its own dual-nationality law. Practical differences mainly concern the filing channel, requests for originals and the availability of an approved translator for a particular language.

French naturalisation and dual citizenship: the two-law test

What France permits

France permits double and multiple nationality. Its official public-service guidance states that French law does not require a foreign national who becomes French to renounce the original nationality. It also recognises that a person may have two, three or more nationalities. See the current Service Public guidance on multiple nationality.

What France requires you to declare

Article 21-27-1 of the French Civil Code requires a person acquiring French nationality by a decision of the public authority or by declaration to indicate:

• the nationality or nationalities already held;
• the nationality or nationalities that will be retained alongside French nationality; and
• the nationality or nationalities the person intends to renounce.

This is a French reporting obligation. It does not amend another country’s citizenship legislation, waive a foreign permission requirement or stop an automatic-loss provision from taking effect.

Counterintuitive point: France can record that you intend to retain a nationality even when the other country’s law says that nationality is lost upon the voluntary acquisition of French nationality.

How to determine whether you can keep an existing nationality

Do not start with a generic online list of “countries that allow dual citizenship.” Such lists often omit exceptions, transitional legislation and differences between citizenship held from birth and citizenship acquired later. Use the following verification sequence for each nationality separately.

1. Establish how you acquired that nationality

Record whether it arose through birth in the territory, descent from a parent, marriage, adoption, naturalisation, restoration or another procedure. A country may protect nationality held from birth while applying different loss rules to a person who obtained it through naturalisation.

2. Identify the event that may trigger loss

Ask the competent foreign authority or a lawyer qualified in that country whether loss occurs:

• automatically when a foreign nationality is voluntarily acquired;
• only after the person signs or files a renunciation;
• only after the state issues a formal release or loss decision;
• unless prior permission to retain nationality was obtained; or
• unless a notification is filed within a stated period.

These routes are materially different. Under an automatic-loss rule, a passport can remain physically unexpired even though the person’s legal nationality status may already have changed. Preserve the passport as part of the evidence chain, but do not treat it as a conclusive legal opinion.

3. Confirm the legally relevant French acquisition date

The filing date is not necessarily the date that matters. For naturalisation by decree, France states that the decree takes effect on its signature date. Declaration routes have their own effective-date rules. Confirm your route before relying on a deadline or requesting a foreign retention approval. CertOf’s guide to French citizenship by decree versus declaration explains the procedural distinction.

4. Test every personal exception

The foreign rule may change according to:

• whether the nationality was held from birth or acquired later;
• the applicant’s age on the French acquisition date;
• the nationality or status of the applicant’s parents;
• marriage, adoption or guardianship history;
• residence inside or outside the other country;
• military or civic obligations;
• an applicable bilateral agreement; or
• a transitional rule protecting people who acquired another nationality before a legislative change.

A country-level embassy FAQ may provide a useful starting point, but it may not resolve these individual variables. For a high-consequence case, ask which domestic authority can issue a nationality certificate, retention decision or other written confirmation.

5. Repeat the analysis for every nationality

If you already hold two foreign nationalities, do not treat them as one dual-citizenship question. Country A may permit retention without formalities, while Country B may require prior permission or impose automatic loss. France requires an accurate account of the nationalities involved, not merely the passport you use most often.

A practical document checklist

Documents commonly relevant to nationality-retention checks

Document	What it helps establish	Translation issue
Current and former passports	Declared identity, nationality history and previous spellings	Do not assume a valid passport alone settles legal nationality status
National identity card or nationality certificate	Formal evidence that a country regarded you as its national when issued	Translate the complete document, including annotations and validity details, if submitted to France
Full birth certificate and parents’ records	Nationality by birth or descent and the identity chain	Names, places and parent details must remain consistent
Marriage, divorce, adoption or name-change record	Explains a change affecting nationality or identity	Include marginal notes, finality wording and court information
Prior retention authorisation	Shows compliance where the other country requires permission before foreign acquisition	Check whether France needs it in the file and whether a French sworn translation is required
Post-acquisition notification receipt	Shows that a foreign reporting obligation was completed	Preserve the filing date, reference number, seal and delivery evidence
Loss, release or renunciation decision	Shows that another nationality ended formally	The operative date and legal terminology must be translated precisely

France does not require every applicant to produce a universal “retention certificate.” Such a document becomes relevant when another country requires it, when the applicant must establish actual nationality status, or when an inconsistency in the French file needs to be explained.

Where French sworn translation fits

French naturalisation guidance requires a French translation for foreign-language documents submitted in the file and requires the original translation. According to Service Public’s civil-status and nationality document guidance, the translation must be completed by a traducteur agréé or by a translator authorised to act before judicial or administrative authorities in another European country.

For this use, “certified translation” is an English bridge term. The practical French questions are:

• Who signs and stamps the final translation?
• Can that translator’s recognised status be verified?
• Will you receive the original signed translation as well as a scan?
• Does the translation include every seal, annotation, apostille page and reference number?
• Are names transliterated consistently with the passport and the rest of the nationality file?

A notary witnessing a signature does not by itself turn an ordinary translation into the translation required for a French nationality file. Likewise, self-translation or a generic accuracy certificate from another market should not be treated as equivalent to a French-approved translator. See the focused guides to French citizenship sworn-translation standards and self-translation and notarisation limits.

Some adult birth or marriage extracts issued in a multilingual format that includes French may not need a separate translation. Apostille, legalisation and translation nevertheless solve different problems. Use the separate guide to apostille, legalisation and sworn-translation order before paying to translate an incomplete document chain.

How the France-side workflow works in practice

1. Choose the correct acquisition route. Decree naturalisation, reintegration and declaration routes do not all use identical filing channels or effective dates.
2. Inventory every nationality. Include nationalities supported by expired documents or acquired by descent, not only the passport currently used for travel.
3. Verify foreign law before the critical date. Determine whether permission must be secured before French nationality takes effect.
4. Obtain written evidence where available. Preserve official messages, application receipts, authorisations and decisions.
5. Build the French civil-status file. France may require a full birth record, parents’ details, proof of nationality and records explaining name changes.
6. Translate the documents that will be submitted. Verify the signer’s accepted status before ordering and retain the original translation.
7. Make the French nationality declaration accurately. Distinguish what you already hold, intend to retain and intend to renounce.
8. Report material changes while the file is pending. Use the channel attached to your application and retain evidence of the update.
9. After French acquisition, complete foreign-country formalities. File any required notification and verify whether passports, identity records or population registers must be updated.

Cost, timing and online-service reality

The retention question has no single France-wide processing time because the decisive foreign procedure belongs to the other country. A prior-permission or notification process may run independently of the French application, so build its deadline around the legally relevant acquisition date rather than around an estimated interview date.

For context, the current French naturalisation-by-decree page lists a fiscal stamp of €255, reduced to €127.50 in Guyane. It also states a maximum response period of 18 months from issuance of the receipt, reduced to 12 months for applicants who can establish at least ten years of habitual residence, with one possible three-month extension. These are general naturalisation figures, not a special dual-nationality timetable. The same official naturalisation page lists the Centre de Contact Citoyens at 0806 001 620, Monday to Friday from 9:00 to 17:00, for online filing assistance and file-follow-up information.

Common failure points

• “France allows dual nationality, so I am safe.” This answers only the French side of the question.
• “My old passport has not expired, so I must still be a citizen.” Document validity and legal nationality status can diverge.
• “The embassy gave me a general answer.” General consular information may not account for the way nationality was acquired, the legally relevant date or a transitional exception.
• “I will resolve it after the French decision.” That may be too late where the other country requires prior permission.
• “The translator can decide which law applies.” A translator can accurately render the document but cannot issue a nationality ruling.

Ask the foreign authority to identify the governing rule and the procedure for obtaining formal proof. Consider a lawyer qualified in that country when the consequences affect property, inheritance, military obligations, children or the risk of having no clearly recognised nationality.

Translation and professional support pathways

Commercial and professional document-support pathways

Pathway	Best suited to	What to verify	Boundary
Individual traducteur agréé	A document that must enter the French file as a sworn French translation	Official listing, language pair, original delivery, inclusion of seals and annotations	Translation does not determine whether nationality is retained
France- or EU-based agency coordinating approved translators	Multi-document packets, less widely served languages or coordinated formatting	Name and qualification of the final signatory, revision process and paper-original delivery	An agency’s marketing is not government endorsement
CertOf	Remote document review, translation preparation, consistent formatting and revision support	Whether the receiving authority requires a French court-listed signer rather than an ordinary certified translation	CertOf does not provide a nationality ruling, legal representation or government filing service

France’s official explanation of the court-list system is available through Service Public’s approved-translator guidance. A provider claiming to be “prefecture approved” should still identify the person who will sign the translation and explain how that status can be verified.

Official and public support resources

France-wide public information and complaint resources

Resource	Cost	Use it for	It cannot do
Service Public and the nationality teleservice	Free information and filing access	French rules, personalised document lists and official filing channels	Issue a binding decision under another country’s law
Centre de Contact Citoyens	Non-premium-rate call	Online filing assistance and French file-follow-up information	Approve retention of a foreign nationality
Foreign embassy, consulate or nationality authority	Information may be free; formal procedures may carry fees	Origin-country rules, competent authority and required notification or permission	Some posts provide general information rather than individual legal rulings
Point-Justice	Free public orientation	Access-to-law information and referral to appropriate legal support	Translate documents or decide the foreign nationality question
Défenseur des droits	Free	Public-service access problems or possible discrimination after ordinary channels have been tried	Replace an appeal or foreign nationality authority

Fraud warnings and complaint routes

French official guidance warns that private websites may charge for supposed appointment or nationality-application assistance even though the government procedure itself is not a paid appointment service. Do not give passport scans, civil-status records or payment details to a provider whose legal identity and role cannot be verified.

• For an ANEF or French online-filing problem, use the Centre de Contact Citoyens and the contact channel attached to the file.
• For a disagreement about the other country’s nationality law, use that country’s competent authority or a lawyer qualified there.
• For delay, misrepresentation or another consumer dispute involving a private translation business in France, use SignalConso. It cannot overturn a nationality decision.
• For a serious public-service access or discrimination issue, consider the Défenseur des droits after using the ordinary administrative channel.

Frequently asked questions

Can I keep my original nationality after becoming French?

France allows multiple nationality and does not normally require you to renounce the original nationality. Whether you actually keep it depends on the other country’s law and your personal circumstances.

Does selecting “I wish to retain my nationality” protect it?

No. It records your intention for the French declaration required by Article 21-27-1. It is not a retention permit and does not bind the other country.

What nationalities must I disclose to France?

The French rule covers nationalities you already possess, those you will retain alongside French nationality and those you intend to renounce. If your status is uncertain, resolve that uncertainty rather than listing only your current passport.

Does a valid passport prove that I retained the nationality?

Not conclusively. A country’s law may change nationality status automatically before a passport database or physical document is updated. Ask how that country formally certifies current nationality.

Do I need permission before the French decree?

Only the other country’s current law can answer this. If prior permission is required, timing may be decisive. Confirm the trigger and obtain the permission before French nationality legally takes effect.

Do foreign nationality documents need a French sworn translation?

If a foreign-language nationality certificate, retention approval, notification receipt or loss decision is submitted in the French nationality file, expect it to need an accepted French translation unless a specific multilingual-document exemption applies.

Can I use a notarised US or UK certified translation?

Do not assume so. France focuses on translation by a traducteur agréé or an appropriately authorised European translator. Notarising an ordinary translator’s signature does not establish that qualification.

What if I already have three nationalities?

Verify each one independently. France permits plural nationality, but each other country may reach a different result when you acquire French nationality.

Can France protect me while I am in my other country of nationality?

Service Public explains that a dual national in the territory of the other state of nationality is generally treated there as that state’s national and cannot rely on French diplomatic protection in the ordinary way.

Prepare the translation after confirming the legal route

If your file includes a foreign nationality certificate, retention approval, loss decision or consular letter, submit the documents securely to CertOf for review. We can help organise translation-ready files, preserve identity details across documents and provide formatting and revision support.

Before ordering, confirm whether the receiving French authority requires a court-listed traducteur agréé. You can also review how to upload and order a certified translation online and compare realistic translation turnaround benchmarks.

CertOf is a document-translation service, not a French authority, foreign nationality office or law firm. We cannot determine whether you retain a nationality, obtain retention permission for you or guarantee a nationality outcome.

Disclaimer: This guide provides general information about French nationality declarations and document preparation. Nationality laws change and can apply differently according to acquisition method, age, family history, residence and effective date. Verify the other country’s current law with its competent authority or a suitably qualified lawyer before relying on a retention decision.