This handbook offers an authoritative, one-stop reference work for the dynamic and expanding field of language learning motivation. The 32 chapters have been specially commissioned from the field’s most influential researchers and writers. Together they present a compelling picture of the motivations people have for learning languages, the diverse ways we can research motivation, and the implications for promoting and sustaining learners’ motivation. The first section outlines the main theoretical approaches to language learning motivation; the next section presents ways in which motivation theory has been applied in practice; the third section showcases examples of motivation research in particular contexts and with particular types of language learners; and the final section describes the exciting directions that contemporary research is taking, promising important new insights for academics and practitioners alike.