The recent study tries to examine the relationship between postgraduates' passion and self-esteem, as well as to determine how much passion and self-esteem scores predict perfectionism. In the first study, (126) Egyptian postgraduate students completed questionnaires for the Passion Scale and Self-Esteem Measure on Google Form. In the second study, (113) postgraduate students from Egypt's various regions, enrolled in various fields of postgraduate studies, completed the Passion Scale, Self-Esteem Measure, and Academic Perfectionism Scale. Data is used in descriptive statistics, Pearson Correlation Analysis, Multiple Linear Regression Analysis, and Path Analysis to explore the aim of the study. The findings of this study show that criteria and harmonious passions can predict self-esteem for postgraduate students, which means that self-esteem can be increased by influencing harmonious passion. Furthermore, they showed that self-esteem doesn't predict perfectionism. Moreover, the analysis revealed that self-esteem cannot be a mediator in the relationship between criterion passion, harmonious passion, and obsessive passion on one hand and perfectionism on the other hand; this differentiation makes them important.