Abstract – The current research aims at investigating the effect of group play on aggression reduction in male preschool students. The population of the study was male preschool students in Mashhad, a city in north east of Iran. Among the preschool centers across the city, one center was randomly chosen for the study, from which thirty students were randomly assigned into two groups of experimental and control. The experimental group would undergo 11 sessions of play therapy. The research benefits from a quasi-experimental pre-test post-test design with descriptive, prescriptive and co-variance analysis for interpreting the data. The results of the study indicate that play therapies reduced the amount of aggression on children to a large extent. Thus, a comparison of the results of pre-test with the post-test indicates a meaningful difference at the p<0.05 degree of freedom, suggesting that group play therapy can reduce the preschool children’s aggression.

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