The aim of the present research was to determine the efficacy of group logo therapy on reducing depression among people addicted to drugs. This research is experimental based on pretest and posttest with a control group. The population under study includes addicts referring to methadone treatment centers for drug addiction in the city of Ghorveh (Niko Salamat) in 2013. The sample size of 60 addicts referring to drug addiction clinic was selected based on the simple random sampling. Then based on the questionnaire scores, as many as 20 people who scored the highest scores in the depression questionnaire were chosen and placed randomly under the control and experimental groups. The experimental group was placed under 10 sessions (1.5 hours) of group logo therapy while the control group was placed under no treatment (covariance analysis) and descriptive statistics were used. Findings revealed that the average depression scores in the experimental group posttest are significantly lower than that of the control Group. On the ground of the research findings, one can say that group logo therapy is effective in reducing depression of then addicts.