Can you keep your Sweden citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Yes, since 1 July 2001 a Swedish citizen who acquires a foreign citizenship, such as U.S. citizenship, does not lose Swedish citizenship.
What the law says
- With effect from 1 July 2001, dual citizenship is permitted without restriction in Sweden.
- A Swedish citizen acquiring a foreign citizenship does not lose Swedish citizenship.
- A Swedish citizen born outside Sweden who is also a citizen of another country loses Swedish citizenship at age 22 unless approval to retain is granted between ages 18–21 (with exceptions).
- Foreigners seeking naturalization as Swedish citizens do not need to renounce their former citizenship.
“With effect from 1 July 2001, a Swedish citizen acquiring a foreign citizenship does not lose Swedish 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 Sweden lets you keep yours.
Source: Swedish nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Sweden embassy or consulate before your oath ceremony. This is not legal advice.
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