Can you keep your Denmark citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Danish citizens who become U.S. citizens keep their Danish citizenship, since Denmark has allowed dual citizenship since 1 September 2015.
What the law says
- On 18 December 2014, Parliament passed a bill allowing Danish citizens to become foreign nationals without losing their Danish citizenship.
- The law came into force on 1 September 2015, so Danes are allowed to hold dual citizenship since that date.
- Historically, Danish citizens were required to renounce their citizenship before obtaining citizenship in another country.
- Former Danish nationals who lost citizenship by accepting another may reobtain Danish citizenship under a provision prolonged to 1 July 2026.
“Danes are allowed to hold dual citizenship since 1 September 2015”
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 Denmark lets you keep yours.
Source: Danish nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Denmark embassy or consulate before your oath ceremony. This is not legal advice.
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