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The present study Aimed to investigate the relationship between personality types and interpersonal problem solving styles with the marital adjustment in the married students at Islamic Azad University, Tabriz Branch. The research population included all married students at Tabriz branch from whom a random sample of 325 participants was selected. The data for the study were collected by a demographic questionnaire made by the researcher, the Neo-Five-Factor Inventory (NEO-FFI), Lack Wallace Marital Adjustment (LWMAT) questionnaire, and Rahim Organizational Conflict Inventory 2 (ROCI-2), Data analysis included Pearson Correlation Coefficient, Independent-samples t-test, and Regression Analysis. The SPSS software was run for the analysis of the data. The results showed that there was a negative correlation between neuroticism and marital adjustment while there appeared a positive correlation between other personality types (agreeableness, extroversion, openness] and marital adjustment. The predictive validity of the three personality types, consciousness, agreeableness, and neuroticism, respectively, had the power to determinate of marital adjustment. Among the interpersonal problem solving styles, the two styles namely, integrating style, and obliging style could validly predict marital adjustment. The regression analysis of all personality types and problem solving styles showed that the three personality types of consciousness, agreeableness, and neuroticism, and the integrating style had a statistically significant power to predict the marital adjustment. No statistically significant difference was found between male and female participants in terms of marital adjustment.