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The purpose of this study is to find out there are differences between the Financial Performance of Conventional Bank Mandiri and Islamic Banks at PT. Bank Mandiri Conventional and Bank Mandiri Syariah 2014-2018. The analytical technique used to compare the financial performance of Bank Mandiri Syariah with conventional Bank Mandiri is the Independent sample t-test method. The analysis conducted shows that there are significant differences for each financial ratio between Bank Mandiri Syariah and Bank Mandiri Conventional in Indonesia. Bank Mandiri Syariah had better performance in terms of LDR and ROA, while conventional Bank Mandiri had better performance in terms of CAR, NPL, and BOPO.