ABSTRACT: Ginger (Zingiber officinale Roscoe) is a spice and widely consumed. It contains numerous bioactive components including phenolic and flavonoid substances. Besides, it exhibits a variety of health promoting effects. In the present study, the antioxidant activity and total phenolic and flavonoid contents of different parts (leaves, stem, young rhizome, and old rhizome) of ginger were assessed. The antioxidant activity of the old rhizome as determined by the FRAP and TEAC assays, as well as the total phenolic content were higher than those of the young rhizome, leaves and stems. Furthermore, a high positive correlation was found between the total phenolic content and antioxidant activity (R2 = 0.994 and 0.993 for the results from the TEAC and FRAP assays, respectively), indicating the total phenolic content might be the main contributor to the antioxidant activity of four parts of ginger. On the contrary, there was a weak correlation between the total flavonoid content and antioxidant activity (R2 = 0.202 and 0.207 for the results from the TEAC and FRAP assays, respectively), which indicated that the flavonoid components could not be the main contributor to antioxidant capacity of ginger. The results showed that the rhizome (either old or young) could be good natural resources of antioxidants.