The Surveys of the Mental Health of Children and Young People (MHCYP) are a series of national surveys of the mental health of children and young people. Each survey involves interviewing a large stratified probability sample of children and young people, and their parents and teachers. The primary aim of the surveys is to collect robust data on a range of topics relating to the mental health of children and young people to improve understanding of the state of children and young people’s mental health and wellbeing and inform the design of mental health services.