The Routledge Handbook of English as a Lingua Franca (ELF) provides an accessible, authoritative and comprehensive introduction to the main theories, concepts, contexts and applications of this rapidly developing field of study.Including 47 state-of-the art chapters from leading international scholars, the handbook covers key concepts, regional spread, linguistic features and communication processes, domains and functions, ELF in academia, ELF and pedagogy and future trends.This handbook is key reading for all those engaged in the study and research of English as a lingua franca and world/global Englishes more broadly, within English language, applied linguistics, and education.