This research handbook is a comprehensive overview of the field of comparative administrative law. The specially commissioned chapters in this landmark volume represent a broad, multi-method approach combining perspectives from history and social science with more strictly legal analyses. Comparisons of the United States, continental Europe, and the British Commonwealth are complemented by contributions that focus on Latin America, Africa, and Asia. The work aims to stimulate comparative research on public law, reaching across countries and scholarly disciplines. Beginning with historical reflections on the emergence of administrative law over the last two centuries, the volume then turns to the relationship of administrative and constitutional law, with an additional section focusing on the key issue of administrative independence. Two further sections highlight the possible tensions between impartial expertise and public accountability, drawing insights from economics and political science as well as law. The final section considers the changing boundaries of the administrative state – both the public-private distinction and the links between domestic and transnational regulatory bodies such as the European Union. In covering this broad range of topics, the book illuminates a core concern of administrative law: the way individuals and organizations across different systems test and challenge the legitimacy of public authority. This extensive, interdisciplinary appraisal of the field will prove a vital resource for scholars and students of administrative and comparative law. Historians of the state looking for a broad overview of a key area of public law, reformers in emerging economies, donor agencies looking for governance options, and policy analysts with an interest in the law/policy interface will find this work a valuable addition to their library.