CEO's narcissism is one of their important personality criteria, which has a significant impact on the auditor's behavior and performance. On the other hand, internal regulatory bodies are one of the important corporate governance mechanisms that can influence the company's activities and decisions, especially transparency and accountability In order to be more efficient and complete their control role in the organization, audit committees create stronger internal control policies by increasing the quality of financial reporting. Based on this, the aim of this research is to investigate the effect of CEO narcissism on audit fees, emphasizing the role of internal regulatory bodies. This research is applied in terms of purpose and descriptive-correlation in terms of nature. In order to achieve the goal of the research, 178 companies were selected from among the companies admitted to the Tehran Stock Exchange during the years 1396 to 1401 (6 years) using the systematic elimination sampling method, and a total of 1068 (year - companies) were considered for analysis. In order to investigate the relationships between variables from multivariate regression and to fit the regression model, the generalized least squares method was used and to test the hypotheses, the panel data method was used. In the accounting literature, the topic of CEO narcissism and audit fee has been investigated, but the impact of internal regulatory bodies such as the audit committee and the quality of internal controls have not been investigated, so investigating this issue is the main innovation and motivation of the present research. The research findings show that CEO narcissism has a positive and significant effect on remuneration. Also, the audit committee and the quality of the internal control system weaken the positive effect of the CEO's narcissism on the audit fee.