Embassy of Belgium in Indonesia
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You can be Belgian by law or become it voluntarily. You can also lose your Belgian nationality. This section will guide you through this.

The Code of Belgian Nationality (WBN) contains the legal conditions relating to Belgian nationality. The Minister of Justice is the ‘guardian’ of Belgian nationality in general and the nationality division of the Federal Public Service Justice monitors the appropriate application of the Code of Belgian Nationality (WBN)

If you are living abroad, contact the competent Belgian embassy or consulate for all general or personal questions about nationality.  

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Dual Nationality in Indonesia

The Indonesian government does not recognize dual nationality. Exceptions are made for children from mixed marriages who were born in 2006 or later. For them, dual nationality can be retained until the age of 18.