<Ol> <Li> When the German citizen acquires a nationality from within the European Union, Switzerland, or another country with which Germany has a corresponding treaty . </Li> <Li> When permission to obtain a foreign citizenship has been applied for and granted in advance of foreign naturalization . Failure to obtain so - called permit to retain German citizenship prior to naturalization results in the individual automatically losing German citizenship upon becoming a naturalized citizen of another country . </Li> </Ol> <Li> When the German citizen acquires a nationality from within the European Union, Switzerland, or another country with which Germany has a corresponding treaty . </Li> <Li> When permission to obtain a foreign citizenship has been applied for and granted in advance of foreign naturalization . Failure to obtain so - called permit to retain German citizenship prior to naturalization results in the individual automatically losing German citizenship upon becoming a naturalized citizen of another country . </Li> <P> Other cases where German citizenship can be lost include: </P>

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