The present study examined gender differences in the rate, type, and relevant variables underlying delinquent behavior among South Korean adolescents. Although female delinquency is increasing and becoming more violent in South Korea, the rate of delinquent behavior was found to be much lower among female than among male adolescents and female adolescents were much less involved in antisocial, aggressive, and psychopathic delinquent behavior compared to male adolescents. Moreover, compared to female delinquent adolescents, male delinquent adolescents were found to have greater tendencies towards antisocial personality, sociability, being sexually abused, and alcohol and drug use. In contrast, female delinquent adolescents had a greater tendency toward depression than male delinquent adolescents. No gender differences were found in the association between family dynamics and delinquent behaviors. Age and antisocial personality had the most significant total effects on male delinquent behavior. In contrast, alcohol and drug abuse was the strongest contributing factors in female delinquent behavior, although the level of alcohol and drug abuse was much higher among male adolescents than among female adolescents.