Can you keep your Finland citizenship when you become a U.S. citizen?
Allowed
Yes, in general
A Finnish citizen who becomes a U.S. citizen keeps their Finnish citizenship.
What the law says
- With effect from 1 June 2003, a Finnish citizen acquiring a foreign citizenship does not lose Finnish citizenship.
- Finnish citizens with multiple nationalities automatically lose Finnish citizenship on reaching age 22 unless they have a sufficient connection to Finland.
- Sufficient connection can be fulfilled by being domiciled in Finland or permanently resident in another Nordic country for at least seven years.
- Affected individuals between age 18 and 22 may submit a written declaration of intent to retain Finnish citizenship, apply for or hold a Finnish passport, or complete military or government service in Finland.
- Individuals with dual citizenship can be deprived of citizenship if sentenced for serious crimes such as terrorism or treason.
“a Finnish citizen acquiring a foreign citizenship does not lose Finnish 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 Finland lets you keep yours.
Source: Finnish nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Finland embassy or consulate before your oath ceremony. This is not legal advice.
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