This research examined the impact of Bangladesh Securities and Exchange Commission (BSEC) in promoting the GDP growth through the process of capital market development. The main objective was to determine the impact of BSEC’s regulatory and development activities on the Bangladesh economy. Given the paramount role of capital markets in channeling long run investments and achieving financial inclusion, the study employed a quantitative methodology through a standard questionnaire based survey of 119 respondents who compromise of investors, analysts and policy makers. Data was statistically analyzed with Pearson correlation to evaluate the connection on the effectiveness of BSEC and the performance of GDP-parameterized capital market. Results indicated a significantly positive association between BSEC’s regulatory quality and capital market development-having a positive influence on GDP. Institutional reforms in BSEC had enhanced transparency, investor confidence and capital formation, the study said adding it had also identified structural limitations in the existing set-up. The findings underscore the necessity of a more restrictive enforcement as well as a variety of financing instruments and informative policy to improve BSEC’s role on national economy.