Psychology, with its dedication to understanding human behavior and its complexities, is a key part in comprehending the underpinnings of violent extremism. This comprehensive resource encompasses all major psychological frameworks related to violent extremism, making it essential reading for scholars, practitioners, policymakers, and students determined to enact positive change in this critical area. This handbook provides a state-of-the-art overview of the psychological drivers of violent extremism, offering multi-level analyses that span individual, group, and contextual factors. Each chapter includes practical sections outlining implications for practitioners and policymakers, ensuring the theoretical insights are directly applicable to real-world scenarios. To clarify such complex concepts, the book is enriched with models and diagrams. By integrating diverse theoretical perspectives and empirical research, this guide provides invaluable insights and actionable strategies to effectively understand and combat violent extremism.