The purpose of this study was to prediction of attitudes toward infidelity based on attachment behavior in couple relationships, marital quality relationship and attachment styles in married women. The descriptive-correlation method was used. The statistical population all married women of Tehran city in year 2018. According to convenience sampling 103 people were selected as samples and they were asked to fill in the attitudes toward infidelity scale, brief accessibility, responsiveness, and engagement scale, marital quality relationship scale and attachment styles. The data were analyzed by tests of Pearson correlation and multivariate regression. Findings showed that there was a significant correlation between attachment behavior in couple relationships, marital quality relationship and attachment styles with attitudes toward infidelity in married women (P<0/01). Regression analyses also revealed that secure attachment style (β= 0.44), anxious ambivalent insecure attachment style (β= 0.53), avoidant insecure attachment style (β= 0.11) can predict attitudes toward infidelity in married women.