Can you keep your San Marino citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Citizens of San Marino who become U.S. citizens keep their San Marino citizenship, as dual citizenship is fully legalized.
What the law says
- San Marino previously required renunciation of previous citizenship to naturalise.
- In 2026 the law was amended to fully legalize dual citizenship.
- Citizenship may be acquired through birth, descent, or naturalisation.
- Naturalised citizens may have citizenship revoked only if obtained by fraud, false representation, or concealment of material fact.
“in 2026 the law was amended to fully legalize dual citizenship”
What about the U.S. side?
The United States allows dual citizenship. At the oath ceremony you promise to renounce allegiance to other countries, but U.S. law does not make you formally give up your other passport. The question is only whether San Marino lets you keep yours.
Source: San Marino nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the San Marino embassy or consulate before your oath ceremony. This is not legal advice.
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