There is an urgent need for improved school-based mental health services to address students' increasing mental health needs. School nurses are often at the frontlines of youth mental health, but report feeling unprepared to manage student needs due to limited training. We conducted a rapid review to identify evidence-based mental health educational interventions for school nurses and evaluate program characteristics. Eleven studies met the inclusion criteria. While the literature evaluating mental health training programs for school nurses is limited, it suggests that training may improve school nurse knowledge, confidence, and preparedness to address student mental health needs and improve the management of student mental health. Additionally, it highlighted the importance of support, resources, and policies that foster mental health promotion. Future research should focus on obtaining a current assessment of school nurse mental health education needs, evaluating existing interventions, and developing more evidence-based mental health training programs for school nurses.