The aim of this study was to investigate the effectiveness of emotion regulation skills training on Aggression of students. The method of the present study was semi-experimental pre-test-post-test design with a control group. The statistical population of the study consisted of eighth grade female students of the first secondary school in Baharestan city in Isfahan province in the academic year 2018-2019 (four schools). To select a sample, the Buss and Perry Aggression Questionnaire were performed on all eighth-grade students of four schools and among the students who scored high in questionnaire, 30 were selected and randomly were placed in the experimental group (n=15) and the control group (n=15). Emotion regulation skills were taught to the experimental group during six sessions, then post-test was performed on the experimental and control groups. Data were analysed by univariate analysis of covariance as statistical method. Findings showed that the research hypothesis on the effectiveness of emotion regulation skills training on aggression of students has been confirmed and the students in the experimental group compared to the students in the control group in post-test were significantly less aggressive. Therefore, it can be concluded that the emotion regulation skills training on aggression of students is effective.
