Objective: The purpose of this study is to investigation of personality disorders and personality traits in men who have gender identity disorder (GID). Identification of personality disorders can be useful for enhancement of the quality of help to the patients.

Materials & Methods: This analytical and cross-sectional study was a comparative and case – control research. 40 men with gender identity disorder were selected by convenient sampling from individuals who have been referred to Tehran Navab Safavi welfare center. Also, 40 available individuals who have no any diagnostic criteria about gender identity disorder in DSM-IV-TR and worked in Islamic Azad University (Tehran Sciences and Researches Unit) were selected as control group and matched with patients. Personality disorders and those frequencies were evaluated with Millon Clinical Multiaxial Inventory-II (MCMI-II). Data were analyzed using by Chi-square and Independent T tests.

Results: The results showed that gender identity disorder patients get higher scores as compared to control group in scales “Dependent” (P=0/038), “Histrionic” (P<0/001), “Antisocial” (P=0/017), “Passive – aggressive” (P=0/007), “Borderline” (P<0/001) and “Paranoid” (P=0/021) and their difference was significant.

Conclusion: Generally, the results of this study showed persons who have gender identity disorder also have some symptoms of personality disorders more than normal people.