The main banking activity basically is taking deposits from the surplus unit and lends it to deficit units, or in other words banks will act as financial intermediaries. In lending activities banks are faced with credit risks. Thus, this paper is examining the determinants of lending behavior in Indonesian banks. This paper uses lagged loans, deposits, capital, non-performing loans, and bank size as determinant variables on lending behavior of Indonesian banks. The data are taken from financial performance of 30 Indonesian banks listed on the Indonesia Stock Exchange from the year of 2011, 2012 and 2013. The model developed in this research is an ordinary least squares method using SPSS software. The result proved that there is no empirical evidence shows that lending behavior of Indonesian banks is influenced by the amount of deposits, non-performing loans, and bank size. Whereas, there is significant evidence shows that lagged loans and capital do influence the lending behavior of Indonesian banks. This indicates that Indonesian banks are making the decision of lending activities based on the previous loans and capital owned by the banks. Capital could be used by the banks to cover the unavoidable losses, therefore it affects the decision making by the Indonesian banks in regards to the lending activities.