An overview of literature on radicalization in the Muslim diaspora in Europe finds identity crises to be a key precipitant to the process. Studies also typically focus on the manipulation of identify by violent Islamic extremist groups. This paper attempts to contribute to the discussion on the role of identity in radicalization by using social identity theory. In doing so, the article explores the formation and transformation process of social identities, and argues that the nature of communitylevel groups and networks may contribute to identity ‘readiness’ for radicalization. To this end, special focus is given to formally recognized Islamist non-governmental organizations (NGOs) and institutions and their potential impact on Muslim religious identity in the European Muslim diaspora. Findings suggest that the more pervasive the ideology of Islamist representatives is, the more likely the normative environment in the diaspora is to be conducive to both non-violent and violent Islamic extremism.