A concise yet scholarly introduction to the principles of administrative law in Aotearoa New Zealand that has so far been unavailable. It elucidates the structure and principles of the law in this area, identifies underlying tensions, and outlines current trends and debates. It also presents a unified account of administrative law as a whole, beyond judicial review.The introductory chapters outline the contours of administrative law and the place of judicial review within this, as well as the principles and theories relevant to understanding and critiquing judicial review and its alternatives. The second part examines judicial review: when it is available, on what grounds (including the NZ Bill of Rights alongside common law grounds of review), and its remedies. The third part deals with judicial norms and remedies beyond judicial review: statutory appeals, collateral challenges and private law causes of action. The final part outlines administrative law beyond judicial norms and remedies: the statutory regimes applicable to administration generally as well as the individual regimes governing each area, non-judicial avenues of redress such as the Ombudsman and specialist tribunals, and administrative justice principles for designing and evaluating administrative decision-making and grievance-resolution regimes.This book is the principles-based guide that law students need to succeed in their academic study. It is equally helpful to judges and practitioners, and to academic and professional audiences beyond New Zealand, seeking a sophisticated understanding of the structure and contours of the subject.