We aimedin this trial to investigate whether different levels of flaxseed oil (FLX oil) can affect the productivity and egg quality of quails during 3-4 months of age. A total of 180 healthy mature quails (120 females + 60 males), aged 3 months, were randomly distributed into 3 groups. Each group contained 4 replicates with 10 females+ 5 males each. The first group received the standard diet included no oil, while the 2^nd and the 3^rd groups received the standard diet included 0.5% and 1.0% FLX oil, respectively. The trial continued for one month, until the 4^th month of age. The data revealed that adding FLX oil to mature quail diets at levels of 0.5% and 1.0% insignificantly improved egg weight (P= 0.892), egg production rate (P= 0.167), egg mass (P= 0.443), and feed conversion ratio (FCR, P= 0.134).  Quail groups which received diets with 0.5% and 1.0% FLX oil consumed feed less (P<0.001) than the control group. This effect was augmented by the increase in dietary oil level since the 1.0% FLX oil-treated group consumed feed less than the 0.5% FLX oil-treated group. There were no substantialalterations in all studied egg quality including egg weight (P=0.891), egg shape index (P=0.204), yolk relative weight (P=0.117), albumen relative weight (P=0.375), shell relative weight (P=0.648), shell thickness (P=0.388), yolk index (P=0.957), and Haugh units (P=0.889). In conclusion, despite the non-significant effect of adding FLX oil to a mature quail diet on laying performance and egg quality, the use of higher levels of FLX oil may be capable of improving egg production indices and feed utilization.