Introduction: Depression is the most prevalent psychotic disorder. In order to cure and prevent the recurrence of this disease, it is necessary to gain more information about remedial methods like Group Cognitive- Behavior Therapy. The aim of this study was to investigate the effects of group cognitive-behavioral therapy on the amount of depression on the patients. Methods: This study was experimental and it included both experimental and control group with a pre test. The subjects were selected from patients with mild depression. Their Beck inventory score ranged between 17-20. Patients were randomly divided in two groups. The subjects of experimental group received eight sessions of group cognitive-behavioral therapy. The Beck depression test was completed by the subjects in three phases before the intervention, after the intervention and one month after that. The data was transferred to SPSS program and analyzed. Results: The results indicated a significant difference between the experimental and control group after the intervention at Beck tests (P=0.043). Furthermore, there was a significant difference in the experimental group between the depression score in patients before and after the intervention (p=0.033) and the score of patients before and one month after the intervention (p=0.492). Conclusion: Group Cognitive-Behavioral therapy decreases depression in patients who suffer from mild depression.

Keywords: Depression; Cognitive Therapy; Psychotherapy

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