Objectives: The aim of this descriptive study was to examine the relationships between identity styles of the Berzonsky model and religiosity. Method: 359 students (182 males and 177 females) who were selected using a randomized stratified multi-stage method from among undergraduate students of Shahid Beheshti and Tehran universities, were assessed using Berzonsky Identity Styles Inventory (ISI), Islamic Orientation Questionnaire, and the Duriez Post Critical Belief Scale (PCBS). Data were analyzed using Pearson correlation coefficient and stepwise regression analysis. Results: Based on correlation analysis, most religiousity variables were positively related to informational and normative identity styles and negatively related to diffuse/avoidant identity style. Also, stepwise regression analysis showed that religious belief and practice, was predicted by informational and normative identity styles, inclusion of transcendence was predicted by normative and diffuse/avoidant identity styles (negatively)  and symbolic processing was positively predicted by informational identity style. Conclusion: The positive relation of most religiousity factors with informational and normative identity styles, and their negative relationship with diffuse/avoidant identity styles indicates that these factors belong to a common  religious construct