--- - |2 Violent radicalization has emerged as an important topic of theoretical and empirical investigation motivated by the devastating face of terrorism and by the aim of preventing such expressions of extremism. One central aspect of such research inquiries is the foundation of solid measurement. In this article, we develop and validate two generic scales pertaining to (1) endorsement of extremism and (2) acceptance of violent and/or illegal means. In conclusion, the scales yielded sound psychometric properties and cross‐cultural equivalence, providing a solid measure of the important aspects of extremism which can be empirically employed in elucidating generic mechanisms of violent radicalization processes. - Scandinavian Journal of Psychology, EarlyView.