Psychological science has largely neglected the role of self-control in studying aggression. Fortunately, the past half decade has witnessed a surge of research on this long-neglected topic, including two self-control-informed integrative theories of aggression. Robust experimental evidence demonstrates that self-control failures frequently predict aggression and, conversely, that bolstering self-control decreases aggression. Research on rumination also suggests that maladaptive anger regulation decreases self-control and, consequently, increases aggression. Advances from social-affective and cognitive neuroscience suggest that the neural mechanisms involved in emotion regulation and cognitive control mediate the relationship between deficient self-control and aggression.