The volume New Politics of Decisionism aims to add a new dimension to the literature of populism. It deals with what Carl Schmitt famously coined as ‘decisionism’ – a form of politics based on the rule of a personal will, which is opposed to the rule of impersonal norms of constitutional law. The new politics of decisionism has gained a new form of populism, and it is equally noticeable in old and new constitutional democracies. The contributions follow the Schmittian idea of legally unbounded politics, usually justified with reference to exceptional circumstances – be that global financial crisis, transnational terrorist threats or massive immigration inflows – which require exceptional measures, and address the following issues: what is populism; how do the new politics of decisionism affect democratic processes and institutions; are constitutional democracies equipped to deal with these sort of challenges; can these politics be curtailed by the involvement of other political actors? New Politics of Decisionism consists of three parts. The first part offers theoretical explanations of the concept of populism and the challenges it poses to liberal democracy. The case studies included in the second part serve to explore the origins, forms, and dynamics of populism in contemporary societies. The third part consists of case studies that explore the general issue of whether courts can confront populism.