This book argues that we can understand and explain the EU as a security and peace actor through a framework of an updated and deepened concept of security governance. It elaborates and develops on the current literature on security governance in order to provide a more theoretically driven analysis of the EU in security. Whilst the current literature on security governance in Europe is conceptually rich, there still remains a gap between those that do ’security governance’ and those that focus on ’security’ per se. A theoretical framework is constructed with the objective of creating a conversation between these two literatures and the utility of such a framework is demonstrated through its application to the geospatial dimensions of EU security as well as specific cases studies in varied fields of EU security. This book was originally published as a special issue of European Security.