Introduction: The present study investigates the effects of similar and dissimilar personality traits on the marital adjustment of university students.Method: This comparative study included 200 couples, ranging from students pursuing Associate Diplomas to PhDs at Islamic Azad University, who were selected using 2-stage cluster sampling. The assessment tools used were the NEO form short questionnaire, and the Locke-Wallas Marital Adjustment Scale (LWMAS). Data were analyzed using variance analysis.Results: Results of neuroticism scales indicated that when both parties were rated as stable, marital adjustment was more likely than when both rated highly in neuroticism. Additionally, in instances when males were accommodating and females were not accommodating, marital adjustment was more frequent than when both parties were not accommodating. [Remark 7] .Conclusion: These findings suggest that certain personality traits may predict successful marital adjustment, as well as the importance of personality factors for married couples.