This study investigated the relationship between narcissism and OCB mediated by impression management motives (IM motives) and moderated by perceived performance appraisal. The study performed two analyses, one with employees’ self-report of OCB and another with leader-reports. Consistent with prior research, the self-reports showed a positive relationship with OCB, while the leader-reports showed a negative relationship. When including the indirect effects, both the analyses indicate a positive relationship between narcissism and OCB, given their high level of IM motives and a positive perception of performance appraisal. In contrast, a negative perception of performance appraisal indicates a decrease in OCB. However, only the analysis with leader-reports was significant. In this case, the relationship between narcissism and OCB went from negative to positive when IM motives and perceived performance appraisal were included. This indicates that narcissists can perform OCB based on their IM motives if they perceive the performance appraisal as positive. The findings reflect the value performance appraisal has for narcissists in motivating them to perform OCB. The results have several implications for both research and practice, as they provide a more sophisticated model of the relationship between narcissism and OCB and reflect around narcissism through an opportunistic lens.