This book offers a novel approach to mapping the people and organisations working in EU affairs, allocating much of the volume to a discussion of non-EU institutional representation in Brussels. Complementary to this, a distinct section focuses on those entities situated in EU capitals connected with EU policy dynamics. The intention of the book is to describe each sector within Brussels’ eco-system, including statistics and numbers, but also to have practical examples of organisations that are represented in EU affairs. The second part of the book is dedicated to interviews with relevant influencers from within the Brussels scene. This publication is a working tool for experts in EU affairs, academics and students. It could also be an interesting read for those seeking a job in EU affairs, as well as entrepreneurs, who want to set up a sustainable business.