Children with attention deficit and hyperactivity disorder have problems in emotion regulation and social skills. The purpose of this study was to investigate the effectiveness of EmoGalaxy video game on social skills of children with ADHD. This research was carried out using a semi-experimental method on two experiment and control groups, with pretest-posttest. The research population included children with ADHD who were referred to Omid and Neshat clinic during the academic year of 1396-97. In order to study the effectiveness of EmoGalaxy, 20 boys who were 7 to 12 years old were selected. They were randomly divided into the experimental (10 children) and the control (10 children) groups. The experimental group had 15 intervention sessions of 45 minutes using EmoGalaxy. The control group received no specific intervention. In order to evaluate the social skill of the students, parents' form of the Gresham & Elliot Social Skill Rating Scale (1990) was used. The obtained data were analyzed using Multiple Analysis of Covariance. The finding indicated significant differences (p<; 0/5) between the experimental and the control group in social skills. The results showed that EmoGalaxy video game was effective in improving the social skills in children with ADHD.