We bring the distinct and complementary existentialist perspectives of Jean-Paul Sartre and Simone de Beauvoir to bear on the phenomenon of moral disengagement in managerial decision-making. Existentialist thinking is a rich source of insight on this phenomenon, because—as we demonstrate—the concept of moral disengagement overlaps significantly with the notion of ‘a consciousness in bad faith’ in Sartre’s writing, and the notion of ‘not willing oneself free’ in De Beauvoir’s writing. These concepts play a critical role in existentialist ethics, and thus (...) existentialists carefully deliberated the phenomenon that these concepts aim to illuminate. Rather than being motivated by self-interest as implied by the bulk of extant empirical work on moral disengagement, existentialist perspectives suggest that moral disengagement can instead be motivated by an overwhelming sense of responsibility towards diverse others. From an existentialist perspective, the temptation to morally disengage will not only be felt by individuals that have a strong, trait-like propensity for moral disengagement, but by managers in general. This temptation is likely to be felt in the specific context of right vs. right dilemmas, which have up to now rarely been studied by moral disengagement scholars. Even though existentialist thought paints the problem of moral disengagement as more widespread and entrenched in the human condition, it also suggests ways of preventing moral disengagement. In arguing for these preventative approaches, we make careful distinctions between Sartre and De Beauvoir, thereby becoming the first to argue that De Beauvoir offers a unique contribution to our understanding of ethical decision-making in management. (shrink)