This report provides a review of the existing literature and evidence base relating to alcohol and drug harms experienced by children and younger people (<25 years) in Scotland. It provides an up-to-date overview of the latest data on prevalence and harms related to alcohol and drug use among children and younger people. It then explores the risk factors contributing to harms among this population, and identifies a number of groups particularly vulnerable to these harms. The review then outlines the treatment and recovery services available to younger people in Scotland, before exploring the wider evidence base on effective alcohol and drug services for younger people. It draws to a close by highlighting a number of key areas for future research.