Aim: To investigate the anti-oxidant properties of esculetin (6,7-dihydroxycoumarin) against H2O2-induced Chinese hamster lung fibroblast (V79-4) dam-age. Methods: The radical scavenging activity was assessed by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, hydroxyl radical, and intracellular reactive oxygen species (ROS). In addition, lipid peroxidation was assayed by the mea-sure of related substances which react with thiobarbituric acid. The amount of carbonyl formation in protein was determined using a protein carbonyl ELISA kit. As well, cellular DNA damage was detected by Weste blot and immuno-fluorescence image. Cell viability was assessed by 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide assay. Results: Esculetin exhibited DPPH radical scavenging, hydroxyl radical scavenging, and intracellular ROS scaveng-ing activities. The radical scavenging activity of esculetin resulted in the protection of cells from lipid peroxidation, protein carbonyl, and DNA damage induced by H2O2. Therefore, esculetin recovered cell viability exposed to H2O2. Conclusion: Esculetin efficiently attenuated the oxidative stress induced cell damage via its anti-oxidant properties. As a result, esculetin may be useful in the development of functional food and raw materials of medicine.