Dual Citizenship in the European Union: trends and analysis (2010-2020) Germany Renunciation requirement for acquisition of citizenship A05 Birth in country (acquisition after birth) n.a. A06 Ordinary naturalisation Renunciation (note: exceptions A18/ A22 + exception if permission) A07 Socialisation-based acquisition n.a. A08 Spousal transfer Renunciation exceptions A09 Filial transfer A10 Adoption A11 Transfer to other relatives A12 Transfer from former citizen Renunciation exceptions A13 Spousal extension Renunciation exceptions A14 Filial extension Renunciation exceptions A15 Extension to other relatives A16 Reacquisition Renunciation exceptions A17 Restricted citizenship rights n.a. A18 Citizenship of a specific country No renunciation A19 Cultural affinity Renunciation exceptions A20 Presumed citizens No renunciation A21 Very long residence n.a. A22 Refugees No renunciation A23 stateless or unclear citizenship No renunciation A24 Special achievements Renunciation exceptions A25 Public service Renunciation exceptions A26 Financial assets n.a. A27 Other reasons Renunciation exceptions Greece Hungary Ireland Italy No renunciation required for any mode of acquisition of citizenship No renunciation required for any mode of acquisition of citizenship No renunciation required for any mode of acquisition of citizenship No renunciation required for any mode of acquisition of citizenship No loss of citizenship upon ret/acq foreign citizenship No loss of citizenship upon ret/acq foreign citizenship No renunciation Renunciation requirement for acquisition of citizenship No loss of citizenship upon ret/acq foreign citizenship L05 Acquisition of foreign citizenship Loss - exceptions Loss - if citizen by naturalisation L06 Non-renunciation foreign citizenship (acquisition by birth) Loss - exceptions n.a. 22 RSCAS/GLOBALCIT-Comp. 2020/4 - © 2020 Author