What role does linguistic diversity play in European democratic and legal processes? Is it an obstacle to deliberative democracy and a hindrance to legal certainty, or a cultural and economic asset and a prerequisite for the free movement of citizens? This book examines the tensions and contradictions of European language laws and policy from a multi-disciplinary perspective. With contributions from leading researchers in EU law and legal theory, political science, sociology, sociolinguistic and cognitive linguistics, it combines mutually exclusive and competing perspectives of linguistic diversity. The work will be a valuable resource for academics and researchers in the areas of European law, legal theory and linguistics.