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Rice (Oryza sativa) is one of the main cereals to many people, especially in Asian countries. Rice bran, as one of the byproducts of rice dehulling, has received an increasing attention as a functional foodstuff in recent years. Ferulic Acid (FA) is one of the phenolic compounds found in plant cell walls in both free and covalently bonded forms. It has also been shown that FA has many functions like antioxidant, anti-inflammatory, antimicrobial, antiallergic, anticarcinogenic, antithrombotic, increasing sperm stability, and enzymatic activity. The objective of this study was to extract Ferulic Acid from the phenolic fraction of rice bran oil using ultrasonic method, followed by antioxidant effectiveness analyses. Oil was extracted from rice bran using ultrasonic method in ethanol solvent. The result was analyzed for phenol yields and contents. Variables tested were the concentrations and volumes of ethanol. Antioxidant effectiveness tests were performed on the highest yields of FA. The results showed that the highest yield of 24% was achieved at ethanol concentration of 80%, ethanol volume of 200 ml, and 25 grams of rice bran. Ferulic Acid content in the phenolic fraction of rice bran oil was 10-20% with the highest Antioxidant Effectiveness of 10.71%.