During the last two decades Europe has experienced a rise in transnational contention. Citizens are crossing borders to advance alternative visions of Europe. They spread protest concepts and tactics and explore new ways of organizing dissent. Far from being a recent phenomenon, transnational protest is obviously more salient in a world of international corporations and global political interaction, compounded by electronic communication and cheap travel. The transnational condition permeates all aspects of protest organization and dynamics-from individual biographies to activist networks to cycles of contention. The contributors offer insight into this multi-faceted condition by combining rich empirical evidence with reflections on the problems of transnational research.