Objective : The present study was carried out in order to assess the effects of Cognitive-Behavioral Group Therapy (CBGT) on victims of school violence, as assessed by the CAPS-CA. Methods : The subjects were 14 children who had experienced school violence and were subsequently diagnosed with PTSD and partial PTSD using the Clinician-Administered PTSD scale for Children and Adolescents (CAPS-CA). Seven children agreed to participate in CBGT, and they received 10 sessions of therapy. After CBGT, both the CBGT and non-CBGT groups were assessed using the CAPS-CA and School Adaptation Test. Results : The study results showed significant decreases in avoidance (p=0.010) and hyperarousal in the CBGT group (p=0.009) following the completion of CBGT. The analysis of school adaptation showed that there was a significant improvement in peer relationships after CBGT in the CBGT group (p=0.045). Conclusion : CBGT is effective in improving PTSD symptoms in children who experience school violence and subsequently suffer from PTSD.