This study tried to explore the determinants of health of the youth in Korea. Especially, it explored how the socio demographic characteristics and delinquent behaviors factors of the Korean youth affect their health. This study used the 2009 Korean Youth Health Risk Behavior On-line Survey for this purpose. It selected 35,668 cases of senior high school students from the raw data and conducted a secondary data analysis. This study conducted frequency analysis, t-test, F-test, and regression analysis. Gender, living with parents, economic status, school type, academic record, internet addiction, problem drinking, drug use were significantly determinants of the health of the youth. Findings may be used for improving health of the Korean youth.