Objective: In this study, it has been aimed to evaluate the cognitive schemas of women those have major depressive disorder (MDD) comorbid sexual trauma related posttraumatic stress disorder (PTSD) and than to compare schemas of women those have MDD comorbid PTSD with schemas of women those have MDD without comorbid PTSD. Methods: Thirty-two women those met DSM IV-TR ciriterias for MDD comorbid with PTSD, and 30 women have MDD without comorbid PTSD participated the study. Automatic Thoughts Questionnaire, Dysfunctional Attitudes Scale and Young Schema Questionnaire were used to assesment of the beliefs, attitudes and schemas of two groups. Results: Women those have MDD comorbid with PTSD had the significantly higher scores of authomatic thoughts and three early maladaptive schemas which were failure, vulnerability and subjugation as compared with women those have no PTSD comorbidity. Women with PTSD comorbidity have also higher rates of suicidal and self harm behaviors. Conclusion: Women those have MDD comorbid with sexual violence related PTSD had more negative beliefs, schemas and higher risk of suicidal and self harm behaviors in comparision with women those have MDD without PTSD. Clinicians should consider these results while they establish their treatment plans and case formulations.