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Abstract: Syzygium jambos (L.) Alstone belonging to the Myrtaceae family have been investigated for evaluation of their biological activities namely antioxidant and antimicrobial activity. The n-hexane, carbon tetrachloride, chloroform, aqueous soluble fractions of methanolic extract as well as crude methanolic extract of stem barks of Syzygium jambos were evaluated for their free radical scavenging activity. The methanolic extract and aqueous soluble fractions of stem barks of Syzygium jambos exhibited significant antioxidant activity with the IC50 value of 36.36 µg/ml and 44.744µg/ml respectively whereas chloroform, carbon tetrachloride and hexane soluble fraction of stem barks exhibited mild antioxidant activity with the IC50 value 191.018, 257.102, 414.79 µg/ml respectively. The crude extract, along with n-hexane, carbon tetrachloride an