This book fills a gap in the existing literature by providing a thorough assessment of EU regulations as a source of secondary legislation and their application in all twenty-seven Member States. It also explores that application in neighbouring countries. EU regulations are perceived as the strongest and the most effective sources of EU secondary legislation and it is well-established by the Court of Justice of the European Union that their provisions have vertical and horizontal direct effect. Part 1 of this book examines these points, providing a backdrop to the analysis in the remaining chapters. Parts 2 and 3 focus on the national reception of EU regulations in Member States, and in selected neighbouring jurisdictions. Written by leading practitioners and academics, the book offers both a conceptual underpinning to this element of the European Union's law-making, as well as its practical application.