The purpose of this study is to investigate the relationship between marriage expectation and differentiation of self. This study has a correlational design. For this purpose, 426 students of Azad Science and Research University of Fars are selected and filled marriage expectation scale and differentiation of self inventory. The results of the study indicated that there is a significant positive relationship between differentiation of self and marriage expectation. Also there is a significant difference between differentiation of self and marriage expectation between two genders. The results showed that differentiation can affect marriage expectation of people. Perhaps this impression can be explained by Bowen theory.