Kyllinga nemoralis has been used in traditional folk medicine. Despite ethnobotanical reports, there are only limited studies on its antioxidant properties. This study determined the antioxidant properties of the ethanolic (KnE), ethyl acetate (KnEA) and petroleum ether (KnP) extracts of K. nemoralis using total antioxidant capacity (TAC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and reducing power assays. Results showed that the antioxidative property of K. nemoralis extracts is extraction solvent-dependent. The TAC of KnP (94.60 mg AAE/g) and KnEA (72.08 mg AAE/g) were significantly higher than KnE (70.25 mg AAE/g). However, the EC50 (effective concentration) of KnE (15.02 mg/L; 112.43 mg/L) and KnEA (62.19 mg/L; 123.13 mg/L) indicates stronger DPPH free radical scavenging activity and reducing power than KnP (765.32 mg/L; 514.85 mg/L). Thus, K. nemoralis is a potential source of natural antioxidant compounds. Moreover, ethanol and ethyl acetate are recommended as a relatively good solvent for the extraction of antioxidant compounds from K. nemoralis.