Objective: To determine anti-viral activities of three Artocarpus species: Artocarpus altilis, Artocarpus camansi, and Artocarpus heterophyllus(A. heterophyllus) against Hepatitis C Virus(HCV).Methods: Antiviral activities of the crude extracts were examined by cell culture method using Huh7it-1 cells and HCV genotype 2a strain JFH1. The mode of action for anti-HCV activities was determined by time-of-addition experiments. The effect on HCV RNA replication and HCV accumulation in cells were analyzed by quantitative reverse transcription-PCR and western blotting, respectively.Results: The dichloromethane(DCM) extract of A. heterophyllus exhibited strong antiHCV activity with an inhibitory concentration(IC_(50)) value of(1.5 ± 0.6) mg/mL without obvious toxicity. The DCM extracts from Artocarpus altilis and Artocarpus camansi showed moderate anti-HCV activities with IC_(50) values being(6.5 ± 0.3) mg/mL and(9.7 ± 1.1) mg/mL, respectively. A time-of-addition studies showed that DCM extract from A. heterophyllus inhibited viral entry process though a direct virucidal activity and targeting host cells. HCV RNA replication and HCV protein expression were slightly reduced by the DCM treatment at high concentration.Conclusions: The DCM extract from A. heterophyllus is a good candidate to develop an antiviral agent to prevent HCV grant reinfection following liver transplantation. Objective: To determine anti-viral activities of three Artocarpus species: Artocarpus altilis, Artocarpus camansi, and Artocarpus heterophyllus (A. heterophyllus) against Hepatitis C Virus (HCV). Methods: Antiviral activities of the crude extracts were examined by cell culture method using The mode of action for anti-HCV activities was determined by time-of-addition experiments. The effect on HCV RNA replication and HCV accumulation in cells were analyzed by quantitative reverse transcription-PCR and western blotting, respectively. Results: The dichloromethane (DCM) extract of A. heterophyllus exhibiting strong anti HCV activity with an inhibitory concentration (IC 50) value of (1.5 ± 0.6) mg / mL without obvious toxicity. The DCM extracts from Artocarpus altilis and Artocarpus camansi showed moderate anti-HCV activities with IC 50 values ​​being (6.5 ± 0.3) mg / mL and (9.7 ± 1.1) mg / mL, respectively. A time-of-addition studies showed that DCM ext ract from A. heterophyllus enabled viral entry process though a direct virucidal activity and targeting host cells. HCV RNA replication and HCV protein expression were slightly reduced by the DCM treatment at high concentration. Conclusions: The DCM extract from A. heterophyllus is a good candidate to develop an antiviral agent to prevent HCV grant reinfection following liver transplantation.