Purpose: This study was conducted to investigate the school related stress and the need of mental health education among adolescents. Method: The subjects were selected by convenient sampling comprising of 1,049 high school students. The instrument of the study was the modified School Stress Scale by Kim (2002) and the Scale of Mental Health Education Need developed by Hyun et al. (2005). Results: School-related stress and the need of mental health education were higher in female students than male ones. Among the types of stress, stress related to academic activities was highest for all students. The need of stress management was highest, which was followed by the need of self-management. As for the need of mental health education and school-related stress according to general characteristics, the need was significantly different according to the Sender, grade, and experience in mental health education, and school-related stress was significantly different according to gender and grade. Conclusion: This study revealed that there was a correlation between school-related stress and the need of mental health education in high school students. This study also suggested the basic information and framework for planning, developing, and providing the school based mental health promotion education for the high school students.