This edited volume offers a critical discussion of the trade-offs between transparency and secrecy in the actual political practice of democratic states in Europe. As such, it answers to a growing need to systematically analyse the problem of secrecy in governance in this political and geographical context. Focusing on topical cases and controversies in particular areas, the contributors reflect on the justification and limits of the use of secrecy in democratic governance, register the social, cultural, and historical factors that inform this process and explore the criteria used by European legislators and policy-makers, both at the national and supranational level, when balancing interests on the sides of transparency and secrecy, respectively.This book will be of key interest to scholars and students of security studies, political science, European politics/studies, law, history, political philosophy, public administration, intelligence studies, media and communication studies, and information technology sciences.