The chapters in this volume allow readers to develop a broad understanding of the issues around language variation and to recognise pedagogical implications of this work in multilingual contexts. The authors explore how variations in Englishes around the world relate to issues in English language teaching and learning. The English language has always existed alongside other languages. However, the last 200 years have shown a dramatic increase in the range, extent and context of contact between English and other languages. As a result of this contact, we find marked variations in Englishes around the world. The first part includes chapters of importance in studying English language variation in the context of education. The second part builds on an understanding of variation and identifies pedagogical possibilities that respect language variation and yet empower English language learners in diverse contexts.