This study provides empirical evidence of the influence of Islamic corporate governance, Islamic intellectual capital, and company size on the firm’s performance of Islamic banks. The quantitative cause-and-effect method is used as the research method. This study involved 12 Islamic commercial banks listed on the Indonesian Stock Exchange (IDX). The study sample consisted of 8 banks that met the requirements for conducting the study using the purposive sampling method. The results of the study show that Islamic corporate governance, Islamic intellectual capital, and company size have a positive and significant impact on the performance of Islamic commercial banks.