The book serves as a guide for all clinicians seeking to improve healthcare outcomes by implementing peer support in the treatment and management of medical and mental health conditions. The book begins with a chapter that describes the importance of peers and how peers are increasingly being utilized to improve medical outcomes. Each chapter opens with an introductory section, include tables and figures, and ends with a summary section for quick reference. Written by experts in the field, this resource covers the clinical implications for peer support in substance misuse, chronic medical conditions, in special populations, and mental illness generally. Each chapter is designed specifically to be accessible for a broad clinical audience of experts and non-experts across medical specialties.