Abstract. In Europe there are important concerns about fundamentalist religious beliefs among Muslim youth and “homegrown” radicalization that can lead to violent extremism. For these phenomena, different explanations are given, but there is very little systematic empirical research. Based on the existing conceptual, theoretical, and empirical literature and using a social psychological perspective, the current paper discusses religious fundamentalism and radicalization among Muslim minority youth in Europe. Specifically, feelings of uncertainty, perceived hostility, and perceived injustice are discussed as three important psychological factors involved in radicalization. Furthermore, the critical importance of intra- and intergroup processes and social networks is discussed. The review of the research is concluded by providing some directions and suggestions for future research and for prevention and intervention.