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Iranians in Germany include immigrants from Iran to Germany as well as their descendants of Iranian heritage or background. There are 100,000 to 120,000 ethnic Iranians living in Germany. With around 25,000 people of Iranian descent, Hamburg is the main center of the Iranian diaspora.
As Iran almost never frees its citizens from their Iranian citizenship (see Article 989 iran. Civil Code ) , which is inherited through the father (or descent), there are many German-Iranian (multiple nationality). The still existing German-Iranian agreement of 1929  regulates in no. II of the Final Protocol that government approval is required prior to the naturalization of nationals of the other State.