Background and Aim: The aim of this research was study the effectiveness of group cognitive- behavior therapy on reducing body dysmorphic disorder and inter personal sensitivity among high school girls in Ahvaz city. Methods: The first sample included 800 students who were selected with multi­ stage random sampleing and completed Y-BOCS-BDD and Inter Personal Sensitivity Subscale Of SCL-90, who that gained high score in Y-BOCS-BDD are selected and under diagnostic interview and 30 subjects who diagnosed body dysmorphic disorder, assigned to two experimental and control group randomly (15 subject in each group).experimental group treated in 12 sessions(60 minutes) of group cognitive- behavioral therapy. In the end gained post­test from both of group. Results: The rare of body dysmorphic disorder decreased (p<0/01) in experimental group in compare with pre-post test and control group. Also, inter personal sensitivity the of experimental group significantly decreased in compare with pre- post and control group. Conclusion: Finding showed that group cognitive- behavior therapy had important role in reducing body dysmorphic disorder and inter personal sensitivity
