Interest in and knowledge of leadership and learning, separately and together, is an international and continuing phenomenon. This book adds to a somewhat under-researched aspect of the field. It focuses both on a particular form of leadership – teacher leadership, and on a particular form of learning – professional development. It considers the connection between teacher leadership and professional development and the first chapter relates this connection to a ‘Leadership for Learning’ conceptual framework, developed through an international, three-year project. The book’s chapters explore teacher leadership and professional development from a number of perspectives, giving rise to three points of particular significance. Firstly the chapters show that, either by accident or design, there is a growing cadre of teacher leaders emerging from a multitude of professional development activities and initiatives. Secondly, a number of new conceptual frameworks are put forward, alongside the adaption and development of extant ones that add to the ever-increasing theorisation of educational leadership and professional development literature. Thirdly, the chapters provide evidence of the connections between leadership and learning as conceptualised in the ‘Leadership for Learning’ framework.This book was originally published as a special issue of Professional Development in Education.