Can you keep your Belgium citizenship when you become a U.S. citizen?
Allowed
Yes, in general
Belgian citizens who become U.S. citizens keep their Belgian citizenship, because Belgium permits dual citizenship.
What the law says
- Since legal changes effective 28 April 2008, Belgian citizens may voluntarily acquire and hold any other citizenship without losing Belgian nationality.
- Before 9 June 2007, voluntarily obtaining any other nationality automatically caused loss of Belgian nationality.
- From 9 June 2007 to 28 April 2008, loss applied only for nationalities of countries still party to the 1963 Strasbourg Convention.
- Being born with another citizenship has always been compatible with holding Belgian citizenship.
- Belgian citizens may renounce Belgian nationality by declaration, but this only takes effect if they hold or are about to acquire another citizenship.
“Belgian citizens are allowed to voluntarily acquire and hold any other citizenships without losing their Belgian nationality”
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 Belgium lets you keep yours.
Source: Belgian nationality law (Wikipedia, summarized on 2026-11-11). Laws change — confirm with the Belgium embassy or consulate before your oath ceremony. This is not legal advice.
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