Integrating comparative empirical studies with cutting-edge theory, this dynamic Handbook provides a comprehensive overview of the study and practice of peacekeeping. Han Dorussen brings together a diverse range of contributions which represent the most recent generation of peacekeeping research, embodying notable shifts in the kinds of questions asked as well as the data and methods employed.The Handbook explores questions concerning the deployment of peacekeepers, the policies and activities undertaken by peacekeeping operations (PKOs), the intended and unintended consequences of peacekeeping activities, and controversies related to post-conflict crime, sexual and gender-based violence in peacekeeping, and the environmental impact of PKOs. Chapters further investigate the distinctions between UN and non-UN-led PKOs, the specific mandates under which peacekeeping operates, and the different roles of military, police, and police and civilian peacekeepers. Concluding with an evaluation of the state of the art of current peacekeeping literature, the Handbook leads the way in developing a coherent agenda for future research.The Handbook will be an essential resource for a cross-disciplinary audience of academics and students interested in IR and conflict resolution. Policymakers involved in peacekeeping and peacebuilding, as well as NGOs operating within (post-) conflict settings, will also benefit from its assessment of recent developments in peacekeeping research.