Article history: Received on: 18/10/2012 Revised on: 06/11/2012 Accepted on: 12/11/2012 Available online: 29/11/2012 The present study was to evaluate the antioxidant potential of ethanol extract from roots of Murraya koenigii. Ethanol extract of roots was used to study their total phenolic and flavonoid contents and antioxidant including radical scavenging of 1,1-Diphenyl-2-picrylhydrazyl (DPPH) and nitric oxide. The ethanol extract showed significant results, Total phenolic contents were estimated to be equivalents to 51.23 ± 2.53mg of gallic acid equivalent and total flavonoid contents were 43.58 ± 1.89mg of catechin/g equivalent. The percentage of DPPH and NO scavenging activity increased with increasing various concentration of extract.