Promoting student health and well-being in school has long been a component of education. Traditionally, sports and physical education programs have stressed the importance of staying physically healthy through exercise. More recently, school-based sexual education and nutrition programs have informed young people about the importance of sexual health and good eating habits. Mental health--a fundamental part of student health and well-being--still remains largely absent from the education agenda. According to the World Health Organization, mental disorders are the single largest health problem affecting young people. Mental disorders can lead to serious consequences if untreated. Early and effective treatment of mental health problems can improve social and behavioural adjustment, school performance, and learning outcomes. The earlier they are addressed through appropriate interventions, the more likely that beneficial effects will be achieved in both the short and long term. For all of these reasons, addressing the mental health of young people should be a priority for schools. This article discusses how schools can address youth mental health and provides steps for successfully integrating mental health in schools.