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Baluran National Park is one of the national parks with varied ecosystems that have 444 species of plants, 13 of which are ferns. Fern are cosmopolitan plants that can be used as herbal medicines, because they produce bioactive compounds, one of which is phenol. Phenol contributes as a natural antioxidant that can protect cellular components from the oxidation process. Phenol content in different plants has the potential to have different levels. The research objective was to predict the potential of 3 species ferns as natural antioxidant based on phenol levels. Samples in the form of frond and rhizome Pteris linearis Poir, Pteris biaurita Linn. and Christella hispidula (Decne.) Holttum obtained from Baluran National Park. Total phenol content was tested using gallic acid as a standard solution measured by a UV-Vis spectrophotometer. Antioxidant activity was tested using DPPH as a free radical compound. The results showed that the levels of total phenol frond and rhizomes Pteris linearis Poir were 41.74 µg / ml EAG and 21.12 µg / ml EAG; frond and rhizome Pteris biaurita Linn. 65.57 µg / ml EAG and 43.50 µg / ml EAG; leaf (ental) and rhizome of Christella hispidula (Decne.) Holttum were 12.81 µg / ml EAG and 17.94 µg / ml EAG. The antioxidant activity frond and rhizome Pteris linearis Poir were 191.67 µg / ml and 230.03 µg / ml; frond and rhizome Pteris biaurita Linn. 29.70 µg / ml and 80.96 µg / ml; frond and rhizome Christella hispidula (Decne.) Holttum were 99 µg / ml and 36.76 µg / ml. The stronge antioxidant activity was found in Pteris biaurita Linn. and Christella hispidula (Decne.) Holttum, while the weakest was found in Pteris linearis Poir. Based on the results of research on phenolic acid in Pteris biaurita Linn. and Christella hispidula (Decne.) Holttum has the potential to be a natural antioxidant.