Background and Objectives: Personality disorders are prevalent among psychiatric patients. These disorders can exist along with other psychiatric disorders or predispose the patients to them. Patients with personality disorder are usually not aware of their disease, and their treatment is difficult and complicated. The present research was performed with the purpose of determining affected patients usually do not have insight about their condition and it make the treatment a complex and hard process. The aim of current study was to determine construct and criterion validity of personality disorders diagnostic tool according to DSM-V.

Methods: This study was a cross-sectional study with correlational design. In this study, Personality Disorder Inventory was translated based on DSM-V, and its psychometric was determined in Persian. The questionnaire’s validity was determined by concurrent validity method using NEO personality inventory. A total of 74 patients and 29 students with personality disorders, whose disorder was recognized by clinical interview, completed two questionnaire. The correlation between domains of the two questionnaires was determined by Pearson correlation test.

Results: There were significant correlations between the domains of Personality Disorder Inventory and those of NEO Personality Inventory (p<0.001(.

Conclusion: The results of the present research showed that the Persian version of PID-5 has appropriate criterion, construct, and convergence validity compared to NEO personality inventory.