The main aim of this study is to examine the mediating effect of psychological capital (PsyCap) on the relationship between proactive personality and academic performance among undergraduates. A quantitative approach with a cross-sectional study was employed. The sample consisted of 390 undergraduate students from Malaysian private universities. Partial Least Square-Structural Equation Modeling was used to confirm the proposed research model and test the hypotheses. Results revealed that proactive personality explained a significant proportion of the variance in PsyCap. Further, PsyCap partially mediated the relationship between proactive personality and academic performance. This study concluded that PsyCap could serve as personal resource to improve students' academic performance. The findings of this study offer valuable theoretical and practical implications. The university's management and academic staff need to work together to design effective training interventions and activities that can promote undergraduates' proactive personality and PsyCap.