This eBook reflects our wish to take into account the recent developments in the research and practice of shared decision making (SDM) in the field of mental health, and share this knowledge with service users, practitioners, researchers, and policymakers interested in SDM in this issue. We view SDM as the process in which decisions related to mental health treatment and interventions are reached as a co-production through sharing different types of knowledge: professional or evidence based versus more experiential knowledge of people with the lived experience of mental ill health. We hope that thisebook will stimulate further the interest in the place of SDM in mental health, and will inform the next stage of debate and development of this important aspect of the subject.