The chapter engages in a survey of what political psychology and European integration have to say to each other in the understanding of the European Union. The chapter draws on five strands of political psychology as part of this engagement – conventional psychology, social psychology, social construction, psychoanalysis, and critical political psychology. Within each strand a number of examples of scholarship at the interface of political psychology and European integration are examined. The chapter argues that the study of the EU has much to benefit from political psychology in terms of theories and methods of European identity and integration, but it also argues that political psychology can benefit from the insights of European integration by rethinking the processes that drive the marking of inside and outside, interior and exterior, belonging and otherness.