Using the realised moments and panel data methods, this paper explores the impacts of EMU on time varying integration of European stock markets over the periods 1990 to 2014. This study suggests that the EMU launch has led to a significant increase in the mean value of realised correlations (i.e., a proxy for EU stock market integration) of EU stock returns. It also provides evidence that monetary convergence of the lower differentials in both interest rates and inflation rates across the sample EU countries strongly has been a key driver for the increase in integration of European stock markets since then.