The emergence of the discipline of global mental health as one of the most dynamic fields of global health underscores the need for this textbook for students of the discipline. Global mental health was cited by the NIMH Director in his 2012 year-ending blog as one of the major advances in mental health in 2012 and by one of the most influential figures in psychiatry and anthropology, Arthur Kleinman, as the exciting future of academic psychiatry (Br J Psychiatry, December 2012). The scope of the book is to cover two major aspects of the field: its scientific foundations and its practice and opens with an original account charting the history of the field from antiquity to its most recent developments. The language and content is geared towards a wide audience of practitioners and students of global mental health, including those who do not have any previous training in a clinical mental health specialty. This textbook, edited by four of the field's most widely acknowledged champions, with 20 chapters authored by over 30 global leaders of the field from diverse institutions and countries, is aimed to be the definitive text of this dynamic new discipline.