This study examined the causality relationship between gender inequality and economic growth in Nigeria, covering the period 2009–2023. The study was anchored on two inequality theories, namely functionalist theory and conflict theory. The ex-post facto was used as the research design for the study. Data for the study were extracted from the World Development Index of the World Bank and the Central Bank of Nigeria (CBN) Statistical Bulletin (2023). The method of data analysis adopted in the study was the Granger-Causality Analysis with the Unit-Root employed to estimate the stationarity status of the variables. The results of the study reveal that there is a causality relationship existing between gender inequality and economic growth in Nigeria, covering the period 2009 to 2023. However, the result reveals that the relationship is bi-directional, flowing from gender inequality to economic. The F-statistics and corresponding probability values show that gender inequality granger causes economic growth. The GIE yielded a p-value of 0.0037 < 0.05, GIEPP yielded a p-value of 0.0137 < 0.05, GHIC yielded 0.0108 < 0.05, and GIED yielded 0.0341 < 0.05. Comprehensive policy interventions that promote gender equality in education, employment, and political representation are necessary to ensure that Nigeria's economic growth is inclusive and resilient.