The research was aimed to determine the effect of fish oil and L-carnitine supplementation in fermented yellow corn diets on the performance of quail (Coturnix coturnix japonica). The experiment was used 160 quails aged 70 days that were divided into five treatments and four replications. Each replication consisted of eight female quails. The mean initial body weight was 156.60±9.61 g with Coefficient of Variance (CV) of 6.14%. The in-vivo digestibility study was carried out on the last week using total collection method. Two quails were chosen randomly from each cage and placed into individual raised cages. Overall this experiment used 40 quails for nutrient digestibility study. The research was carried out using a completely randomized design. The experimental diets were P0 = basal diet (ricebran, concentrates, yellow corn), P1 = ricebran, concentrate and fermented yellow corn, P2 = P1 feed+10 ppm of L-carnitine, P3 = P2 feed + 4% of tuna fish oil, and P4 = P2 feed + 4% of lemuru fish oil. The observed variables were dry matter digestibility, organic matter digestibility, extract ether digestibility, feed consumption, HDP, egg weight and feed conversion ratio. The results of variance analysis showed that substitution of yellow corn with fermented yellow corn increased dry matter digestibility, organic matter digestibility, extract ether digestibility, feed intake and egg weight, whereas the addition of L-carnitine in the diet of fermented yellow corn increased the value of the HDP and improved feed conversion. Substitution of yellow corn with fermented yellow corn in the feed increased dry matter digestibility, organic matter digestibility, extract ether digestibility, egg weight, whereas the addition of L-carnitine 10 ppm in the feed of fermented yellow corn improved the HDP. Suplementation of tuna fish oil 4% in the diets increased egg weight. Suplementation of tuna fish oil and lemuru fish oil in the yellow corn supplemented diets improved feed conversion of quail at production phase. (Key words: Fermented yellow corn, Fish oil, L-carnitine, Growth performance, Japanese quail)