Background: Early maladaptive schemas are factors that can affect the lives and relationships between couples. But the key question is, can the dimensions of mindfulness mediate the relationship between early maladaptive schemas and attitudes toward extramarital relationships? Aims: The purpose of this study was to investigate the relationship between early maladaptive schemas and attitudes to extramarital relationships with regard to mediating the dimensions of mindfulness. Method: This was a descriptive correlational study. Statistical population was all couples 25-40 years old in Pomegranate. 205 couples were selected as sample by available sampling method. Research tools include Habibi's Metacognitive Relationship and Purulence Questionnaire (2012), Short Freiburg Mindfulness Questionnaire (2006), and Young's Early Maladaptive Schema Questionnaire (1988). Data analysis was performed using multiple path analysis and mediation analysis. Results: The final model fits well with the data, and early maladaptive schemas through mindfulness dimensions predict attitude toward meta-marital relationships (p<0/05). Also, the results of mediation analysis showed that mindfulness, description, non-judgment and non-reaction had the most important mediating role (p<0/05). Conclusions: It can be predicted from early maladaptive schemas and mind dimensions of meta-cognitive relationships.