Can You Keep Your US Citizenship? Dual Citizenship Rules by Country
Key findings
- The United States is not the blocker: Americans can hold another citizenship unless they formally renounce before a US consular officer.
- Most popular destinations and every Caribbean citizenship-by-investment program in this report allow dual citizenship.
- The main restrictions to watch are Japan, India, China, Singapore, Austria, the Netherlands, and Spain for ordinary naturalization.
The United States lets you hold a second citizenship — it does not ask you to give up your US passport when you naturalize elsewhere. So whether you can keep both comes down entirely to the other country's rules. Most major destinations allow dual citizenship; a shrinking handful still require you to renounce your prior nationality to naturalize. This report sorts the common destinations into who lets you keep both and who doesn't.
Check your specific pathways: see which citizenship and residency pathways you match, then confirm each country's dual-citizenship rule before you commit.
The US side: you're free to hold both
The key thing most people get wrong: the US permits dual citizenship. Naturalizing in another country, or claiming citizenship by descent or investment, does not automatically cost you your US citizenship — you only lose it if you formally renounce it before a US consular officer. So the question is never "will the US let me?" — it's "will the destination country let me keep my American one?"
Countries that allow dual citizenship
These countries let you naturalize (or claim citizenship by descent or investment) without renouncing your US passport:
| Region | Countries that allow dual citizenship |
|---|---|
| Europe | Portugal, Ireland, Italy, France, Greece, Germany (since the June 2024 reform), United Kingdom, Sweden, Finland, Denmark, Switzerland, Malta, Cyprus |
| Americas | Canada, Mexico, Brazil, Argentina, Chile, Colombia, Costa Rica, Panama, Uruguay, Dominican Republic, Trinidad and Tobago |
| Caribbean (investment) | St. Kitts & Nevis, Antigua & Barbuda, Dominica, Grenada, St. Lucia — every Caribbean citizenship-by-investment program permits dual citizenship |
| Other | Australia, New Zealand, Türkiye, Israel |
Countries that restrict it
These countries generally require renouncing your other citizenship to naturalize — though most have exceptions, and the rules are often looser for citizenship acquired by descent or marriage than by naturalization:
| Country | The catch |
|---|---|
| Spain | Renunciation required to naturalize, except for Ibero-American countries and a few others — the US is not exempt, so Americans naturalizing in Spain are formally asked to renounce |
| Netherlands | Renunciation generally required when naturalizing, with exceptions (e.g., spouses of Dutch nationals, those born in the Netherlands) |
| Austria | Strict — renunciation required, with narrow exceptions |
| Japan | Does not permit dual citizenship for adults — you must choose |
| India | No dual citizenship; narrow citizenship-by-descent cases need careful handling of other-citizenship status, while OCI is the practical lifelong status for many Indian-origin Americans |
| Singapore | No dual citizenship for adults |
| China | No dual citizenship |
The thing that changes everything: how you acquire it
Dual-citizenship rules frequently depend on how you become a citizen:
- By descent or birth: often not treated as a choice, so renunciation rules may not apply — you may simply be recognized as having been a citizen all along.
- By marriage: many otherwise-restrictive countries waive the renunciation requirement for spouses.
- By naturalization or investment: this is where the strictest renunciation rules bite.
So a country in the "restricts" table above may still let you hold both, depending on your pathway in.
Methodology
This guide draws on Citizeo's dataset of citizenship and residency programs (which flags dual-citizenship eligibility per pathway) combined with published national nationality laws, as of June 2026. Dual-citizenship law is nuanced and changes often, and outcomes can hinge on how citizenship is acquired and on bilateral agreements. Treat this as a starting point and confirm your specific situation with the relevant authority or a qualified advisor before acting.