The aim of this study was to predict the feeling of loneliness and tendency to divorce based on attachment styles according to the role of mediation self-differentiation. This study is of descriptive method and the design is correlational based on path analysis. The study population included all divorce-seeking couples referring to branches 6, 7 and 8 and enforcement branch of family court in Shahre rey, Tehran in 2016. Using available sampling method, 200 subjects were selected. The data were collected using four questionnaires: The UCLA Loneliness Scale (Russell, 1996) Differentiation of Self Inventory (Skowron & Smith, 2003), Divorce Tendency Scale (Rusbult, 1986), and Adult Attachment Scale (Colins & Read, 1990). The results of the analysis were analyzed using structural equation analysis. Results: The results showed that there is a significant relationship between attachment styles with loneliness and tendency to divorce. There is also a significant relationship between self-differentiation with loneliness and tendency to divorce. Finally, attachment styles through self-differentiation can predict loneliness and tendency to divorce. Discussion and Conclusion: The research data with the proposed model has a perfect fit, so self-differentiation plays a significant mediator role in the relationship between attachment styles with loneliness and tendency to divorce.
