Antioxidant activity of methanolic and aqueous extract of Amorphophallus campanulatus tuber was studied for its free radical scavenging property on different in vitro models e. g. - 1, 1-diphenyl-2- picryl hydrazyl (DPPH) method, nitric oxide method and reducing power method. The extracts showed good dose dependant free radical scavenging property in all the models. IC50 values for water and methanolic extract were found to be 59.91 and 99.40 2g/mL in DPPH method and 77.02 and 70.20 2g/mL in nitric oxide method. In reducing power method, aqueous extract shows more reducing power as compared to methanolic extract. Ascorbic acid was used as standard. It is concluded that the aqueous extract shows more antioxidant activity as compared to methanolic extract.