The purpose of the present study was to determine the relationship between the personality variables of the five-factor model and marital satisfaction. The sample of the study included 400 mothers of primary school children in Tehran. Data was collected through administration of NEO-Five Factor Inventory and ENRICH questionnaire. The results of the study showed significant negative relationship between Neuroticism and marital satisfaction. But agreeableness and conscientiousness were positively correlated with marital satisfaction. These findings suggest that agreeableness and conscientiousness deserve increased attention as significant correlates of marital satisfaction.