Stock markets have long played an important role in economic life (Stijn, V. N., Frans, B., Ludo, C., 2006). The objective of this study is to explore the presence of a causal relationship between stock market development and economic growth in Sri Lanka. Sample period uses annual time series data over the period from 1990 to 2013. To address this relationship, a Granger Causality Test was employed. Nominal GDP values are used as a proxy for economic growth, and market capitalization ratio (MCR) is used as a proxy for stock market development. The results of this study support that the stock market performance plays a major role in economic growth in Sri Lanka.