Islamic banking was established as an alternative for people who want to use banking services in accordance with sharia principles. The purpose of this study was to determine the effect of DPK (Third Party Funds), NPF (Non Performing Financing), FDR (Financing to Depocit Ratio) and inflation to financing Mudharabah Islamic Commercial Banks. The sample in this study is Islamic banks which are included in Islamic Commercial Banks, which are selected by purposive sampling technique. Data collection techniques using the documentation method. Data analysis techniques using multiple regression analysis The results showed that (1) Deposits variable had a positive effect on mudharabah financing; (2) Variable NPF has a positive effect on mudharabah financing; (3) The FDR variable does not affect mudharabah financing; (4) The inflation variable does not affect mudharabah financing