The article examines the role of collective identification processes in the politicization of Turkish migrants in Germany. Building on the suggestion that politicized collective identity is a dual identity, the authors predicted and found that dual identification as both Turkish and German was positively related to politicization among members of the Turkish minority in Germany. This relationship was found in both cross-sectional and longitudinal analyses and held up even when the influence of sociodemographic variables, past political activity, and other forms of collective identification were statistically controlled, suggesting a unique and causal role of dual identification. However, there was no evidence that dual identification fosters radicalization or even political violence. The implications for social integration of politicization driven by dual identification are discussed, as is the interplay of dual identification and separatist identification that could underlie the shift from involvement in normative politics to radicalization.