The aim of this study is to determine the effect of solution-focused approach in decreasing depression among teenage girls. Depression is one of the most common diseases in these days which have been known as mental flu. Adolescence also plays a pivotal and key role in our in which depression is very common. So it is necessary to treat this disorder in adolescence. This research is a quasi-experimental design in which pretest-posttest design with a control group has been used. The population was all teenage girls in Sahneh; 20 girls were drawn from the population through stratified random sampling and then randomly assigned to two groups: one experimental and one control. Data were collected through Beck\'s depression questionnaire (BDI). Dependent variable was solution-focused therapy in which experimental group was provided with 8-hour group counseling (8 sessions which took one hour). In the meantime, control group was provided with irrelevant teachings (teaching study skills) to eliminate the effect of subjects. After the sessions were wound up, BDI questionnaire was administered again among both groups. One month later, the posttest and then BDI questionnaire were conducted. After that, t test and covariance were used to analyze the findings. The results showed that solution-focused group counseling is effective in decreasing depression among teenage girls and its significance level is at ?= 0/01. In addition, the findings obtained through posttest indicated how stable the effect of therapy is. In other words, solution-focused group counseling has significantly led to decreasing depression in teenage girls.

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