Today, for the first time in the history of the EU, political and legal scholarship has focused on routes that could lead to the exit of a Member State from the European Union. This book provides a detailed discussion of the legal prerequisites, process and specific issues arising from a Member State’s exit from the EU. This may take the form of a voluntary withdrawal under Article 50 TEU, such as in the case of “Brexit”, or from the Eurozone, as was discussed in the case of Greece. However, it could also occur in the form of a “forced” exit, including expulsion due to an infringement of fundamental rules, or secession—the most relevant example at present being Catalonia. Legal scholars, practitioners and students, as well as political scientists and anyone interested in what the future holds for European integration, will find this book particularly relevant.