As of 1 January 2020

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As of 1 January 2020, it became legal to become a national of another country in addition to Norway (dual citizenship). You have not lost your Norwegian citizenship if you became a citizen of another country on or after 1 January 2020.

In order to be able to document that you have not lost your Norwegian citizenship when you became a citizen of another country, you only need to document that you acquired the other nationality on or after 1 January 2020.