Syzygium cumini L is an evergreen tree belongs to the family Myrtaceae, mainly found in tropical regions. The fruit of the plant is used to treat diabetes. In this present study we have looked for antioxidant activity of methanolic seed extract of Syzygium cumini. Total flavonoid, phenolic and proanthocyanidin content of seed extract were measured. The extract was also checked for antioxidant assays namely 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, superoxide anion radical scavenging activity and ability of chelating ferrous ions.