This book is an excellent resource on language teacher agency for graduate students, applied linguists, and language teacher educators. The rigorous research presented in the chapters unpacks the complexities associated with language teacher agency. Analyzing agency in different geographical settings and diverse contexts through a wide range of research methodologies, the chapters deepen our understanding of the links between agency, identity, and practice. The critical lens evident throughout the chapters invites the reader to engage with agency and other relevant constructors deeply and critically.