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Public opinion is increasingly at the heart of both political and scholarly debates on European integration. This article reviews the large literature on public support for, and opposition to, European integration, focusing on conceptualization, causes, and consequences: What is public support for European integration? How can we explain variation in support and Euroskepticism? What are the consequences of public support for elections and policy making in the European Union? The review reveals that although a growing literature has sought to explain individual support for European integration, more work is needed to understand the ways in which opinions are shaped by their national context and how increasing public contestation of the European Union poses a challenge to, and an opportunity for, the future of the integration project.