This state-of-the-art volume provides an interdisciplinary overview of current topics and research foci in the areas of linguistic diversity and migration-induced multilingualism and aims to lay the foundations for interdisciplinary work and the development of a common methodological framework for the field. Linguistic diversity and migration-induced multilingualism are complex, mufti-faceted phenomena that need to be studied from different, complementary perspectives. The volume comprises a total of fourteen contributions from linguistic, educationist, and urban sociological perspectives and highlights the areas of language acquisition, contact and change, multilingual identities, urban spaces, and education. Linguistic diversity can be framed as a result of current processes of migration and globalization. As such the topic of the present volume addresses both a general audience interested in migration and globalization on a more general level, and a more specialized audience interested in the linguistic repercussions of these large-scale societal developments.