Can You Keep Your US Citizenship? Dual Citizenship Rules by Country
Key findings
- Acquiring another citizenship does not automatically end U.S. citizenship. Loss requires a legally recognized expatriating act performed voluntarily with intent to relinquish U.S. nationality.
- 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.
Americans can generally acquire another citizenship while keeping their U.S. citizenship. The harder question is often whether the other country permits that combination under the particular route being used. A citizenship claim through a parent may receive different treatment from naturalization after years of residence.
That difference explains why a simple list of countries that “allow” dual citizenship is only a starting point. The route, any exception, and the applicant's existing citizenships determine whether both can be kept.
Acquiring another citizenship does not automatically end the U.S. one
The United States permits dual nationality. Becoming a citizen elsewhere does not, by itself, mean giving up U.S. citizenship. The State Department generally presumes that Americans intend to retain it when they naturalize in another country. See its dual-nationality guidance.
Formal renunciation is one way U.S. nationality can be lost, but it is not the only legally recognized expatriating act. The act must be voluntary and accompanied by an intention to relinquish U.S. nationality; the State Department explains that distinction in its relinquishment guidance. An ordinary second-citizenship application should not be described as automatically causing that loss.
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, Barbados |
| 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 for most ordinary naturalization cases, except for Ibero-American countries and a few others. The US is not exempt, so Americans using ordinary Spanish naturalization are formally asked to renounce. Recognition as Spanish by origin is a different story. |
| 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 |
Nicaragua also requires care in a long-term residence plan. Its January 2026 constitutional reform requires ordinary foreign naturalization applicants to renounce their original nationality; the specific exception for Central Americans of origin does not create a general exception for U.S. citizens. Residence there should not be presented as a routine path to keeping two citizenships.
How citizenship is acquired changes the comparison
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.
A country in the restrictive group may therefore allow a particular applicant to keep both citizenships. This is especially relevant when one spouse has an ancestry claim and the other expects to naturalize later: a shared destination does not guarantee the same dual-citizenship result.
Permission to hold both also leaves the responsibilities of each citizenship in place. The practical benefits of a second passport are strongest when its work and residence rights fit the household’s plans, and the accompanying obligations are understood. Our report on citizenship obligations abroad looks at that continuing relationship.
Ukraine illustrates why nationality and acquisition route have to be considered together. Its 2026 framework includes a simplified declaration process for eligible U.S. citizens, but that does not create citizenship eligibility on its own. A person applying through territorial origin still needs the qualifying connection and applicable examinations. Someone already Ukrainian through a parent has a different documentation case. The State Migration Service’s explanation and its current route guidance describe the distinction.
Related Citizeo reports
- Countries That Allow Dual Citizenship
- Countries That Do Not Allow Dual Citizenship
- What Obligations Come With Dual Citizenship?
- How Americans Can Get an EU Passport
Methodology
This guide draws on published nationality laws and the official sources linked from individual pathway guides. 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.