This study aimed to evaluate the effectiveness of schema therapy on body-image, self-concept, and maladaptive schemas in patients with body dysmorphic disorder. This is a quasi-experimental study, with pretest-posttest research plan and follow-up services. The research population comprised all patients with body dysmorphic disorder in Ahwaz city. The sample consisted of 10 people from this population having dysmorphic disorder whose selection was done randomly and when chosen, they were divided into two groups of experimental and control. Instruments used in this research are satisfaction with body-image questionnaire (Soutu and Garcia, 2002), self-concept questionnaire (Beck et al., 1990), body dysmorphic disorder questionnaire (Rabie et al., 1390) and the Young Schema Questionnaire (shortened form) (Schmidt, Joiner, Young and Telch, 1995; as quoted from Hamidpour, Dolatshahi, Poorshahbaz, Dadkhah, 1389). In this study, after the position of baseline, the intervention began and after 20 sessions of schema therapy for these participants was carried out, there was a follow up after the interval of one month. To analyze the data, multivariate analysis of covariance (MANCOVA) was used. The results of data analysis showed that schema therapy leads to an increase in satisfaction with body-image, elevation of self-concept and reduction of body maladaptive schemata in the patients with deformity in the experimental group, compared to the control group.