Aim:This study aimed to design an anger management package for high school students and to assess its effectiveness on their depression, anxiety, and stress. Method: The study was a single group quasi-experimental research with pretest-posttest design. A total of 39 students aged between 14 and 15 (M = 14.33 and SD = 0.48) were chosen using convenient sampling from Tehran City’s private schools and took part in 5 sessions based on cognitive-behavioral therapy. Multidimensional School Anger Inventory (MSAI, Smith, Furlong, Bates, and Laughlin, 1998) and Depression, Anxiety & Stress Scale (DASS, Lovibond & Lovibond, 1995) were answered by the participants before and after the intervention. Finding: The results of repeated measures illustrated that anger management training improved destructive expressions and anger experience; however, positive coping did not change significantly. In addition, depression, anxiety and stress were also significantly diminished. Conclusion: In sum, it can be concluded that the designed anger management package for high school students has positive effects on students’ mental health. Therefore, anger management training for families is recommended.