Nationality rules differ enormously between countries, and this is not a page that can tell you whether you qualify. Some countries pass citizenship down indefinitely; others stop at one generation born abroad, require registration before a deadline, or do not permit dual nationality at all. What follows is how to find out for Monaco, and what to settle before you spend anything.
Quick facts
Monaco has four consular offices in the United States, in Coral Gables, Dallas, San Francisco and Washington, D.C. With more than one, the office that matters is the one whose district covers your state of residence — and that is not always the nearest.
Monégasque consular offices in the United States
Applications and enquiries go through the office whose district covers your state, though the decision itself is taken in Monaco:
The questions that decide your case
- How far down does descent run? Through a parent is common; through a grandparent is much rarer; through a great-grandparent is unusual anywhere.
- Is there a deadline? Several countries require a child born abroad to be registered within a set period, after which the claim is lost.
- Does Monaco permit dual nationality? No, and the loss is the hardest on this site. Article 8 of the 1992 nationality law loses Monegasque nationality to anyone who is naturalised abroad or acquires a foreign nationality on request. It happens by operation of law, on the day, with nothing to apply for and nobody to appeal to.
- Does the line pass through either parent? Some nationality laws were paternal for decades and were reformed later, sometimes with retroactive effect.
- What obligations come with it? Military service and tax residence attach to nationality in some countries regardless of where you live.
Documents a claim by descent normally rests on
- Birth certificates establishing the unbroken line, each certified for use abroad.
- Marriage certificates covering every change of surname in that line.
- The ancestor’s Monégasque passport, identity card or other proof of nationality.
- Evidence of whether and when an ancestor naturalised elsewhere, which in some countries breaks the line.
- Translations into French where required.
Before spending money on this
Ask the consular office what Monégasque law actually allows in your circumstances before engaging anyone to help with it. Genealogists and specialist firms exist and can be useful where records are old or scattered, but they are not a substitute for knowing whether the claim exists at all — and that answer is free.
If your own immigration position in the United States is unresolved, take advice from an immigration lawyer before approaching any foreign authority.
Monaco: the loss happens by itself
Article 8 of Law No. 1.155 of 18 December 1992 on nationality: "Perd la nationalité monégasque: 1° Toute personne qui se fait naturaliser à l'étranger ou qui acquiert, sur sa demande, une nationalité étrangère." Toute personne — it reaches Monegasques by birth exactly as it reaches those naturalised.
What makes this different from the other restrictive countries on this site is the mechanism. There is no decision to be taken. No sovereign ordinance, no ministerial order, no declaration by you, no notification to anyone. The nationality is gone on the day the other one is acquired, whether or not Monaco's civil registry has recorded it and whether or not you are still holding a valid Monegasque passport.
And there is nothing to apply for first. No retention permit or dispensation exists. The only government authorisation anywhere in article 8 concerns serving in a foreign army, not taking a foreign nationality. Withdrawal by sovereign ordinance, under article 10, is a separate route that applies only to nationality acquired by naturalisation — it is not what happens here.
Monegasque nationality is also notoriously difficult to acquire in the first place. Treat the two as mutually exclusive and the choice as effectively final.
Checked on 7 October 2026 against the consolidated text of Law No. 1.155 of 18 December 1992 on LégiMonaco, the Principality's official legal database. Article 8 is unamended; the most recent amendment to the Act, in 2021, changed article 3.
Office names, addresses and telephone numbers on this page come from our directory, and the count above is taken from the same records as the listing. Procedural rules come from the authority itself — always confirm with the office that covers you. Apostille status checked against the HCCH official status table on 2026-10-05.