Starting from the key idea that learners and teachers bring diverse linguistic knowledge and resources to education, this book establishes and explores the concept of the multilingual turn in languages education and the potential benefits for individuals and societies. It takes account of recent research, policy and practice in the fields of bilingual and multilingual education as well as foreign and second language education. The chapters integrate theory and practice, bringing together researchers and practitioners from five continents to illustrate the effects of the multilingual turn in society and evaluate the opportunities and challenges of implementing multilingual curricula and activities in a variety of classrooms. Based on the examples featured, the editors invite students, teachers, teacher educators and researchers to reflect on their own work and to evaluate the relevance and applicability of the multilingual turn in their own contexts.