It is commonplace that the modern world is more international than at any point in human history. Yet the sheer profusion of terms for describing political orders above the nation-state-including "international," "global," "transnational," and "cosmopolitan," among others-is but one indication of how conceptually complex this topic actually is. Taking a wide view of international projects in Europe since the eighteenth century, Nationalism and Internationalism Intertwined explores discourses and practices to challenge nation-centered histories and trace the entanglements that arise from international cooperation. In this volume, a multidisciplinary group of scholars in history, political science, philosophy, computer science, and other fields ask how internationalism and adjacent concepts have been experienced, understood, constructed, debated, and redefined across different European political cultures.