Sociocultural linguistics has long conceived of languages as well-bounded, separate codes. But the increasing diversity of languages encountered by most people in their daily lives challenges this conception, and more recent scholarship complicates traditional associations between languages and social identities. Diversity—and even super-diversity—is now the norm. This volume examines the increasing diversity of linguistic phenomena and addresses the theoretical-methodological challenges that accounting for such phenomena pose to sociocultural linguistics. Diversity and Super-Diversity brings together top scholars in the field and stages the debate on super-diversity that will be sure to interest sociocultural linguists, generating discussion and informing future research.