Abstract. The present study was conducted to evaluate the antioxidant activity of seven types ofmacroalgae extract from Malaysia. The extract was prepared with methanol respectively. 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay and reducing power were used to study their antioxidant activity while totalphenolic content was measured using Folic-Ciocalteu method. The macroalgae extracts were compared withcommercial antioxidant, butylated hydroxyanisole (BHA). Total phenolic content of macroalgae extractswere expressed in Gallic acid equivalent, mg/L. Caulerpa racemosa showed the highest total phenoliccontent with the value of 19.711 mgGAE/L ± 0.2546. In DPPH free radical scavenging activity assay,Turbinaria conoides showed the highest scavenging activity in 50 mg/ml extract concentration with the valueof 73.57 % ± 0.5739 compared to another macroalgae extracts. The IC50 value of Turbinaria conoidesextracts is 2.46 mg/ml. Low IC50 value will indicates the strong ability of the macroalgae extract to act as aDPPH scavenger. Caulerpa lentillifera showed the highest absorbance reading in 50 mg/ml extractconcentration with the value of 0.603 ± 0.0015 in reducing power assay. Increased absorbance of the reactionmixture indicates greater reducing power.