Emotional dysregulation was explored as a mediator of the relationship between perceived father rejection and young adult male and female aggression. Among undergraduate college students (N = 534), emotional dysregulation was assessed as a combined construct and then as distinct components. Analyses revealed that impulsivity mediated the relationship between perceived father rejection and aggression for both males and females. Nonacceptance of emotions was partially supported as a mediator of the perceived father rejection–aggression relationship among males, but not females. Results suggest that although father–child relationships may contribute to a variety of emotion regulation difficulties, impulsivity may play an integral role in the development of aggression. Researchers and clinicians are encouraged to pay particular attention to the process by which impulsivity may influence aggression for father-rejected sons and daughters, with additional attention to nonacceptance of emotions for sons. Limitations and future research recommendations are discussed.