The purpose of this study is to measure the efficiency of banks, which are leading actors in the financial system, using the Data Envelopment Analysis and investigate whether there is a development in their efficiency on a yearly basis by the help of Malmquist Total Factor Productivity Index. In this context, we have used uninterrupted data belonging to 20 commercial banks in the Turkish banking sector with public and private capital between 2009 and 2011. According to the results of the analysis determined using the input and output components by adopting the intermediary approach, the efficiency levels of the banks were high and there was a slight increase in their total factor productivity on a yearly basis.