An experiment was conducted to evaluate the effects of including enzymatically treated Artemisia annua L. (EA) in broiler diets on growth performance, meat quality, and oxidative stability of breast and thigh muscles. A total of 256 one-d-old Arbor Acres broiler chicks were randomly allotted into four groups with eight replicates of eight birds each. Broilers in the four groups were offered basal diet supplemented with 0.0, 0.5, 1.0, and 1.5 g/kg EA during the 42-d experiment, respectively. The ADG, ADFI, and feed/gain ratio (F:G) were measured at 42 d of age. Breast and thigh muscle samples from eight birds per treatment were obtained at 42 d to determine meat quality, free radical scavenging activity, and lipid peroxidation. All treatment groups had similar ADG, ADFI, and F:G during the 42 d experiment (P > 0.05). Drip loss at 24 h and shearing force of breast muscle were linearly (P < 0.05) and quadratically (P < 0.05) decreased by EA addition. The drip loss at 24 h and 48 h, cooking loss and shearing force of thigh muscle followed the same fashion. The supplementation of EA quadratically increased 2, 2-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS) (P = 0.004) and 2, 2-diphenyl-1-picrylhydrazyl (DPPH) (P = 0.035) free radical scavenging activities in breast muscle, and linearly (P < 0.05) and quadratically (P < 0.05) increased ABTS and DPPH scavenging activities of thigh muscle. Increasing levels of EA linearly (P < 0.05) or quadratically (P < 0.05) or both decreased the malondialdehyde (MDA) concentrations in breast and thigh muscle samples during 15 d of storage at 4°C. The results indicated that EA supplementation improved meat quality and oxidative stability of breast and thigh muscles in broilers. The inclusion level of 1.0 g/kg EA in broiler diet was recommended.