Previous research has, almost only, examined prejudice from either a personality or a social psychology perspective with results favoring the one or the other. In five correlational or experimental studies (N = 379, 182, 80, 139, and 148, respectively), the present paper integrates these perspectives. Specifically, we examine whether personality (Big-Five factors, social dominance orientation, and right-wing authoritarianism), or social psychology (group membership, group identification, and contextual factors), or an integration of both is the best way of explaining prejudice. Results from causal modeling and multiple regression analyses showed that a joint personality and social psychology model outperformed the personality-only and the social-psychology-only models. The findings emphasize the importance of integrating various approaches and disciplines to explain psychological phenomena in general and prejudice in particular.