This edited collection focuses on general principles and practices of professional learning and development in both pre-service and in-service teacher contexts for language education around the world. The field of teaching is a constantly evolving profession, and one of the most important aspects of teaching is learning. Research shows that the more professional learning and development that teachers engage in, the more likely their students are to succeed and the more likely they are to be effective and fulfilled in their careers. This edited collection seeks to stress the continued importance of teacher engagement in professional learning and development for language educators through a variety of different essential elements, among them pre-service teacher education, in-service teacher education, utilizing professional associations, as well as technology-enhanced activities. The book showcases the diversity of teacher learning and development activities and practices used in unique and atypical language education contexts around the world. The contributions in this collection exhibit work done on the African continent and in countries such as Brazil, Canada, Japan, Nepal, Saudi Arabia, the United Arab Emirates, the United States, and the United Kingdom. The book will be especially useful for students and pre-service teachers in TESOL, language teaching, and bilingual education, as well as in-service teachers of multilingual learners.