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The production of fatty acid methyl esters (FAMEs) by a two-step in-situ transesterification from two kinds of rice bran was investigated in this study. The method included an in-situ acid-catalyzed esterification followed by an in-situ base-catalyzed transesterification. Free fatty acids (FFAs) level was reduced to less than 1% for both rice bran A (initial FFAs content=3%) and rice bran B (initial FFAs content=30%) in the first step under the following conditions: 10g rice bran, methanol to rice bran ratio 15mL/g, H₂SO₄ to rice bran mass ratio 0.18, 60°C reaction temperature, 600rpm stirring rate, 15min reaction time. The organic phase of the first step product was collected and subjected to a second step reaction by adding 8mL of 5N NaOH solution and allowing to react for 60 and 30min for rice bran A and rice bran B, respectively. FAMEs yields of 96.8% and 97.4% were obtained for rice bran A and rice bran B, respectively …