The objective of this study was to empirically analyze the impact of the Nigeria capital market performance and her socio-economic development in the Country. The socio-economic development was proxy by the gross domestic product (GDP). While the capital market variable considered include stock market capitalization (SMC), stock market index (SMI), trade share (TS) and capital market saving ratio (CMRS). To ease understanding, the research is divided into five chapters. The study solely employed secondary source of data collection using the ordinary multiple regression analysis it was found that the capital market indices have not impacted significantly on the GDP. The government therefore advised to out up measures to stem up investors’ confidence and activities in the market performance so that if could contribute significantly to the Nigerian socio-economic development, allocates these funds to projects of best return to fund owners. This allocative function is critical in determining the overall growth and development of the economy. The functioning of the capital market affects liquidity, acquisition of information about firms, risk diversification, savings mobilization and cooperate control. Therefore, by altering the quality of these services, the functioning of stock markets can alter the rate of economic development. Many efforts have been towards understanding the relationship between capital and the economic development of Nigeria. The capital market of every economy is setup for the attainment of specific objective which includes economic growth and stability; Data were collected and analyzed using multiple regression analysis. These include F-test to determine the significance of the individual variables and the second order test, which include test for autocorrelation, normality test and heteroscedasticity. The result of the study shows that the capital market has a positive and significant impact on the country’s economic development. On the strength