One of the basic principles of Swedish civil law has been the avoidance of dual citizenship. However, with the adoption of the Citizenship Act of 2001, Sweden abandoned this principle. The law was further amended on April 1, 2015.
On July 1, 2001, a new Citizenship Act came into effect in Sweden. The new law made it possible to become a citizen of another country without losing your Swedish citizenship. The law also gavechildren further opportunity to become Swedish citizens independent of their parents.
As of July 1, 2001, if you are a Swedish citizen and become a citizen of a another country, you can keep your Swedish citizenship, if the other country permits it. By the same token, if you become a Swedish citizen you can keep your foreign citizenship if the laws of that country permit it.
The U.S. Immigration and Citizenship Act states that all U.S. citizens, including those who have dual citizenship, must be in possession of a valid U.S. passport when leaving and entering the U.S. It is thus advisable for dual citizens to bring both passports when traveling internationally.
A provisional regulation made it possible for those who had lost their Swedish citizenship as a result of being granted citizenship in another country before July 1, 2001, to regain their Swedish citizenship through notification before June 30, 2003. On April 1, 2015, the law was further amended and now anyone who lost his/her Swedish citizenship due to applying for another country's citizenship, may now submit a request to become a Swedish citizen again.
More information is available on our website, under Regaining Swedish citizenship.