This study was conducted to investigate the effects of thyme (Thymus vulgaris L.) and Achillea fragrantissima plants on growth performance of quail birds. A total number of 450 unsexed quail birds, 7 days old were randomly divided into sex equal experimental groups with three replicates of 25 birds each for 42 days. The first group was fed on the basal diet as a control. The 2^nd and 3^rd groups were fed on 5 and 10 g thyme powder/kg diet respectively. The 4^th and 5^th groups were fed on 5 and 10 g achillea powder/kg diet, respectively. The 6^th group was fed on 5 g of each thyme and achillea powder/kg diet. The results indicated that adding of 5 g achillea/kg diet increased the live body weight and body weight gain but not significant (P> 0.05) differ in control group. While birds fed on diet with 5 g achillea significantly (P<0.05) decreased feed intake and improved feed conversion compared to the control group. However, no significant (P> 0.05) change on carcass characteristics due to thyme and achillea adding to quail diets compared to the control group. Additionally, no significant (P> 0.05) effects were observed in total protein, albumin, globulin and albumin/globulin ratio and triglycerides due to the treatments. Birds fed on diet with 5 g achillea/kg diet significantly (P<0.05) decreased the serum low-density lipoprotein (LDL), Aspartate transaminase (AST) and Alanine transaminase (ALT) and increased high-density lipoprotein (HDL) compared with the control group.