Leadership of powerful states and organizations is crucial for the success of regional integration projects. This book offers a theoretical model explaining such leadership. By applying the model to eurozone governance and reform, the book combines innovative theorizing on leadership in regional and international affairs with original research on Economic and Monetary Union politics. Six in-depth case studies analyze the (non-)leadership of Germany and EU institutions in eurozone crisis management. Moreover, the book evaluates the eurozone's leadership record since the outbreak of its crisis and helps readers understand the leadership of collective actors, and the extent to which they can contribute to overcoming crisis and fostering European integration. In particular, the book investigates the under-researched questions of who provided leadership in the eurozone crisis and why, and which conditions are required to achieve successful leadership in the EU.