This collection examines the urban multilingual realities of inhabitants of the Arabian Peninsula in the early 21st century from the perspectives of learners, teachers and researchers. Focusing on both public and private spheres, it considers the importance of both English and immigrants' languages in a context of rapid socioeconomic development. Extending beyond English–Arabic societal bilingualism, the language practices of the Peninsula's citizens and residents serve multiple purposes in their daily lived realities. Chapters on home and heritage languages, identity, ELT, commercial signage and academic publishing contribute to a deepening understanding of the inherent linguistic diversity in these dynamic societies.