This study was conducted to investigate the effects of different levels of lentil byproducts on the growth performance, relative weight of internal organ and carcass traits of growing quails. Day-old quails (240; Coturnix coturnix japonica) were randomly divided into 4 treatments, each with 4 replicates: control, 10%, 15% and 20% lentil byproducts-fed to the quails between 1 to 35 days of age. The mash experimental diets were isocaloric and isonitrogenous. No significant effects of the lentil byproduct inclusion level were observed on the mean total feed consumption, feed conversion ratio and body weight. Similarly, the relative weight of internal organs and carcass yield were not significantly affected by lentil byproducts' inclusion levels. The results indicate that lentil byproducts might be included in the diet of growing quails up to a level of 15% with no negative effects.