This study ascertained the effect of intellectual capital on firm value of listed oil and gas companies in Nigeria for a period of twelve years from 2012 to 2023. The dependent variable is firm value while the independent variables are human capital, structural capital and relational capital. This study adopted an ex-post facto research design with data extracted from the annual reports of nine sampled companies. Descriptive statistics and OLS linear regression technique were used in the analysis of data. Findings revealed that structural and relational capitals both have significant positive effects on firm value. Human capital showed a negative effect on firm value, however, this was not statistically significant. It was therefore recommended that listed oil and gas companies in Nigeria should prioritize investments in organizational processes, systems, and knowledge management and should also develop comprehensive stakeholder engagement strategies that focuses on building strong mutually beneficial relationships.
Keywords: Intellectual Capital, Relational capital, structural capital
