The present study aims to explore the effects of grandiose and vulnerable narcissism on emotion dysregulation and examine the mediating role of self‐esteem on these associations. Undergraduates (N = 426) completed self‐report measurements on grandiose narcissism, vulnerable narcissism, self‐esteem and emotion dysregulation. Correlation analyses indicated that grandiose narcissism was negatively correlated with emotion dysregulation, while vulnerable narcissism was positively correlated with emotion dysregulation. Moreover, mediational analyses revealed that self‐esteem fully mediated the association between grandiose narcissism and emotion dysregulation, and partially mediated the association between vulnerable narcissism and emotion dysregulation. The present study highlights the importance of self‐esteem and deepens the understanding of the associations between the two forms of narcissism and emotion dysregulation.