Prevalence of mental health disorder is increasing among young people. It is recognized that early intervention is essential in supporting young people, and care provided within schools to support emotional well-being is recommended as part of this process. A scoping review was undertaken examining school nurses' experiences of supporting the mental health of schoolchildren. Findings suggest that school nurses have a central role in supporting young peoples' mental health, although a number of barriers exist which impact on school nurses' preparedness for this aspect of their role. While there are inconsistencies in the provision of mental health training available to support school nurses, when training is implemented it has positive outcomes for service provision and quality of care. A number of challenges for school nurses were also identified, and recommendations for practice are suggested in the article.