Background & Objectives: Puberty is a sensitive period during which the adolescent experiences rapid changes in aggressive behavior and cognitive distortions comparing to the physical changes. The aim of this study was to examine the effectiveness of puberty mental health training on aggression and fear of body image in male second grade high school students in Ahvaz. Method: The research method was quasi experimental with pre-test and post-test design with a control group. The statistical community was all high school students in male second grade high schools of Ahvaz in the academic year of 2011-12. Among these, 30 individuals were selected using multi stage random sampling method and placed randomly into two experimental and control groups (i.e.15 persons in each group). The experimental group received 8 sessions of puberty mental health training while the control group did not receive any intervention. Aggression and fear of body image questionnaires were administered prior and after intervention for both experimental and control groups. Data were analyzed using multivariable covariance analysis. Results: The results of covariance analysis showed that aggression and fear of body image in experimental group significantly decreased comparing to the control group. Conclusion: It seems puberty mental health training to be effective on reducing aggression and fear of body image of students in the puberty age.