[1] It is mainly based on jus sanguinis; however, it is possible to obtain citizenship after 5 years of residence in Bulgaria.

The Bulgarian Ministry of Justice is in charge of processing citizenship applications.

Naturalised citizens who do not belong to at least one of the aforementioned groups, are required to give up all other nationalities.

[5][6] Bulgarian citizens can live and work in any country within the EU and EFTA as a result of the right of free movement and residence granted in Article 21 of the Treaty on the Functioning of the European Union.

The QNI considers, in addition to travel freedom, on internal factors such as peace & stability, economic strength, and human development as well.