Narcissism refers to a personality that has high self-esteem, need for attention, sense of personal superiority, low social empathy, and a greater desire to use other people's skills. The present research aims to relate managers' narcissism with investment in research and development based on the moderating role of corporate social responsibility performance. In terms of purpose, the research is an applied and correlational type of research. In this regard, 132 companies were selected as sample member companies that were active in the Lisbon Stock Exchange during 2019-2020. The research data was collected from the real financial statements of the companies through the Codal website and compiled using Excel software. The method of hypothesis testing is multivariate regression using Eviews 12 statistical software. The findings show that managers' narcissism has no significant relationship with investment in research and development. The performance of corporate social responsibility has a statistically significant relationship with investment in research and development, and the performance of corporate social responsibility does not have a moderating role on the relationship between managers' narcissism and investment in research and development. The results of this research add to the development of literature related to managers' narcissism and investment in research and development. This research shows evidence that narcissism is not an influential characteristic for investment in research and development, unlike other studies that consider narcissism as a negative characteristic for investment in research and development because the desire to be praised by shareholders makes managers less likely to research and develop.
