The present study, involving 128 undergraduate participants, sought to better understand relations between trait impulsivity, cognitive control, and bulimic symptoms. Three models were contrasted. One model posited that impulsivity and cognitive control would be independent, non-interactive predictors of bulimic symptoms. A second model posited that cognitive control deficits would mediate relations between impulsivity and bulimic symptoms. A third model posited that relations between trait impulsivity and bulimic symptoms might be stronger among individuals lower in cognitive control relative to those higher in cognitive control. The latter moderation model was systematically supported across two measures of cognitive control and two measures of bulimic symptoms. Wider implications of the findings are discussed. For example, it is suggested that treatments facilitating higher levels of cognitive control can be recommended among patients high in impulsivity.