This edited book brings together an international cast of contributors and chapters which recognise the complexity of teacher leadership and its situated and dynamic nature. Chapters in this book are research-driven, and each reports on findings from (teacher-led and otherwise) research, synthesising the current state-of-the-art in each area. Each chapter uses illustrations of relevant practices from which lessons can be drawn. The aim is to come to a broad understanding of what best practices have emerged over the years, and where gaps still remain. Each of the chapters contributes to our understanding of how the different elements that make up teacher leadership are interconnected, with the concluding chapter synthesising these into a framework of language teacher leadership. This book will be of interest to pre-service and in-service teachers in the context of a professional learning community, as well as students and scholars of Applied Linguistics, Language Teaching and Learning, and Teacher Education.