ABSTRACT This study aims to examine whether the Chief Executive Officer (CEO) narcissism has a moderating effect on pay-performance sensitivity. We fill a gap in the existing literature, which overlooks the behavioral aspects of agents in the design of executive compensation plans, by providing evidence of the moderating effect of CEO narcissism on pay-performance sensitivity. We shed light on the fact that shareholders and potential investors might face higher agency costs when investing in firms led by narcissistic CEOs, considering that narcissistic CEOs tend to receive higher levels of compensation than their peers, regardless of the company’s performance. This study also has implications for board members and recruiters, who may take this psychological aspect into account when proposing compensation schemes to CEOs. The results extend the prior discussion on low pay-performance sensitivity (or its non-significance) by suggesting that this might be partially attributed to the psychological characteristics of CEOs, which play a role in the design of executive compensation. A sample of 1,057 non-financial U.S. firms (8,869 firm-year observations) during the period 2002-2018 was analyzed using system generalized method of moments (GMM-SYS) regressions due to the endogenous relationship between CEO compensation and firm performance. The main results show that CEO narcissism reduces the association between CEO compensation and firm performance, supporting the prediction that narcissism can be viewed as a “dark side” in the design of executive compensation plans. This finding is robust to alternative measures of pay-performance sensitivity, and further robustness checks indicate that our results are not driven by CEO overconfidence. Therefore, this study contributes to the literature by providing, to the best of our knowledge, the first empirical evidence of the moderating effect of CEO narcissism on pay-performance sensitivity.