This handbook provides a systematic overview of language education from the perspective of internationalization. Internationalization includes but also goes beyond the integration of intercultural and international perspectives, practices, and dispositions into education with the objective of improving, pluralizing, and decolonizing pedagogy and research in response to the changes and challenges facing society today. Despite its affordances for institutional, curricular, and individual development in the context of language education as a scholarly field, internationalization remains undertheorized and underexplored in language education as an approach that can further support language educators to enhance their teaching practice. Drawing together an international cast of contributors and examples from a variety of contexts, this handbook will serve as an essential reference for researchers and graduate students in applied linguistics and related fields, language teachers and language teacher educators, support services professionals, program developers and curriculum designers.