The Routledge Handbook on De-Radicalisation offers an overview of the historical settings, theoretical debates and national approaches to de-radicalisation. The volume includes discussions of both rightwing/leftwing political and religiously inspired de-radicalisation processes, and includes some practitioners as contributors. It thus hopes to span the differences between practitioners and the academics, and to enable an interaction between practices and academic knowledge. Radicalization and violent extremism is now a major challenge around the globe, from al-Shabaab in Somalia to FARC in Colombia, right-wing groups in Europe and several militant Islamist groups in the Philippines. There are no signs of these challenges diminishing in the future; rather, the contrary. As new and violent extremist groups and environments emerge, while others are weakening, there is an increasing need for knowledge not only about how individuals physically exit these movements, but also how to change their mindset and stimulate the de-radicalization processes. Historically, much of the focus on these topics has been highly securitized and militarized; however, currently, there is an increasing consensus that there is also need for more community-based and 'soft' approaches. This handbook includes new perspectives on the softer approaches by non-state actors such as civil society groups, municipalities, religious actors and so on. The volume thereby sheds light on the various debates around different approaches to and thinking around de-radicalization processes in addition to bringing forward new and less well-known perspectives, not only from a theoretical angle, but also from a more practical perspective in relation to experiences and lessons learned from specific groups and areas. This handbook will be of much interest to students of deradicalisation, counter-terrorism, political violence, political extremism, security studies and IR in general.