The primary purpose of the study was to investigate the extent of financial integration between the four major money markets (Pakistan, India, Sri Lanka, and Bangladesh) in the SAARC region. To determine the association between these money markets, this study deployed variety of robust time series techniques such as JJ Co-integration Test, Granger Causality Test, Impulse Response Functions (IRF), and Variance Decomposition Analysis (VDC). Monthly data for the period 2007–2015 was utilized for the data analysis whereas Call Money rates and Interbank rates were used as proxies of money markets. The empirical findings confirmed the presence of long term relationship between the nominal interest rates in SAARC region. Additionally, the results also unveiled the existence of bi-directional causal relationship between the money markets of Pakistan, India, and Sri Lanka. It was also found that Bangladesh’s money market is most rigid and unresponsive to other markets in the region. This study also confirmed the existence of robust ingredients for formulation of a monetary union in the SAARC region.