The purpose of this research was to investigate the effect of the social capital components (trust, respect, ethical values, cooperation, responsibility, sense of security, social participation and communicative skills) on marital satisfaction of married students in Islamic Azad University of Isfahan Khorasgan Branch. The research was descriptive correlation study. The statistical population consisted of all 1150 married students, out of whom a sample 288 persons were randomly selected according to Kerjesi & Morgan formula. For collecting the data, two questionnaires were administered, Enrich Standardized Questionnaire of Marital Satisfaction (1979) with 47 items and reliability between 0.48–0.90 according to Olson and Olson (1999) and between 0.50- 0.87 according to Mahdaviyan (1376); and a researcher- made Questionnaire of Social Capital consisted of 51 items with the reliability of 0.75. To analyze the data, regression analysis was applied. The research findings showed that different social capital dimensions including mutual trust, respect, cooperation, ethical values, responsibility, sense of security, social participation and communicative skills have significant effect on marital satisfaction (P£0.0001).