The World Health Organization estimates that approximately one in five young people under the age of 18 experiences some form of developmental, emotional or behavioural problem, and one in eight experiences a mental disorder. Because research shows that half of adult mental disorders begin before the age of 14 and that early intervention can prevent and reduce more serious consequences later in life, it is critical to expand the role of mental health professionals with schools worldwide. Schools have the potential to affect the mental health of millions of young people, as well as those who work in schools. Research indicates that programmes promoting mental health are among the most effective of health promoting school efforts. This paper discusses the health promoting schools framework, reviews effective strategies for promoting mental health in schools, and provides examples from Zhejiang Province, China. This article also discusses the key roles that mental health professionals can play in promoting mental health through schools. As advocates, policy makers, researchers and teachers, mental health professionals can bridge the sectors of education, mental health and public health. Developing common frameworks and interdisciplinary training will create a foundation of shared understanding to achieve this goal.