What is the role of couples’ attachment styles in marital relationships? What is the role of religious commitment in decreasing or increasing the quality of marital relationships among intact couples and couples with insecure attachment styles? In response to these questions, the present study was designed to investigate the moderating role of religious commitment on the relationship between avoidant and anxious attachment styles and marital intimacy. Participants were 150 married couples (150 males, 150 females) living in Shahrekord. All participants were asked to complete the Short-Form Experience in Close Relationships Scale (ECR-S), Religious Commitment Inventory (RCI) and the Intimacy Scale (IS). The results showed that avoidant and anxious attachment styles were negatively associated with marital intimacy, and religious commitment was positively associated with marital intimacy. Moreover, results of moderating regression showed that religious commitment moderated the relationship between avoidant attachment style and marital intimacy, but it did not influence the relationship between anxious attachment style and marital intimacy. Based on the results of the present study, it can be concluded that religious commitment can affect the relationship between avoidant attachment style and marital intimacy the extent of negative relationship between avoidant attachment style and marital intimacy is lower in men and women with higher religious commitment than those with lower religious commitment.