Transnational connections are a defining feature of contemporary Europe. They include cross-border economic and cultural exchange, migration within or into the EU, and Europeanized forms of political debate or activism. How significant are such transnational connections for European integration, and how do they relate to broader societal transformations in the EU and its member states? This interdisciplinary volume examines the multifaceted contours of transnationalism in Europe, probing their importance for EU and member-state governance, political mobilization, social inclusion and exclusion and collective identities. It demonstrates that the concept of transnationalism provides a valuable analytical framework for studying European politics and societies, and makes a case for incorporating the concept more systematically into the research agenda of European Studies.