”The European Union and Interregionalism” is the most comprehensive study of interregionalism to date, providing a vigorous analysis of its role and functions in the architecture of global governance, and of the place of qualitative differences between regional actors in shaping interregional relationships. Regionalism itself is an established phenomenon, with regional politics becoming increasingly institutionalised. As a result, with the EU as forerunner, regions have begun to exert themselves in the external policy space, developing networks of relations including, prominently, interregional relations. We have thus seen the emergence of a new governance space at the interregional level, banded on one side by sites of global governance, and on the other by governance at the regional level. Important questions challenging the current literature of these interregional structures include, do interregional relationships conform to theoretical expectations?, and what patterns of engagement and interaction are emerging within the EU”s core interregional partnerships, and are these replicated elsewhere? Exploring interregionalism beyond the core Europe-Asia partnerships, including the network of relations centred on ASEAN, this book should be read by all those engaged in consideration of interregional structures to understand how patterns of EU-centred interregional engagement, rather than being sui generis, are increasingly evident in the broader network of interregional relationships