The analysis and understanding of multilingualism, and its relationship to identity in the face of globalization, migration and the increasing dominance of English as a lingua franca, makes it a complex and challenging problem that requires insights from a range of disciplines. With reference to a variety of languages and contexts, this book offers fascinating insights into multilingual identity from a team of world-renowned scholars, working from a range of different theoretical and methodological perspectives. Three overarching themes are explored – situatedness, identity practices, and investment – and detailed case studies from different linguistic and cultural contexts are included throughout. The chapter authors' consideration of 'multilingualism-as-resource' challenges the conception of 'multilingualism-as-problem', which has dogged so much political thinking in late modernity. The studies offer a critical lens on the types of linguistic repertoire that are celebrated and valued, and introduce the policy implications of their findings for education and wider social issues.