This handbook comprehensively explores the European Union's institutional and policy responses to crises across policy domains and institutions - including the Euro crisis, Brexit, the Ukraine crisis, the refugee crisis, as well as the global health crisis resulting from COVID-19. It contributes to our understanding of how crisis affects institutional change and continuity, decision-making behavior and processes, and public policy-making. It offers a systematic discussion of how the existing repertoire of theories understand crisis and how well they capture times of unrest and events of disintegration. More generally, the handbook looks at how public organizations cope with crises, and thus probes how sustainable and resilient public organizations are in times of crisis and unrest.