Can you keep your Switzerland citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Swiss citizens who voluntarily acquire another citizenship, including U.S. citizenship, keep their Swiss citizenship.
What the law says
- There has been no restriction on multiple citizenship in Switzerland since 1 January 1992.
- Swiss citizens who voluntarily acquire another citizenship keep their previous citizenship, subject to the laws of the other country.
- A Swiss national who also holds another country's citizenship may be required to renounce a citizenship if that foreign country's nationality law forbids multiple citizenship.
- An estimated 60% of Swiss nationals living abroad in 1998 were multiple citizens.
“Swiss citizens who voluntarily acquire another citizenship keep their previous citizenship (subject to the laws of the other country)”
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 Switzerland lets you keep yours.
Source: Swiss nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Switzerland embassy or consulate before your oath ceremony. This is not legal advice.
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