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BSF maggots have almost the same protein content as fish meal so that they can be used as a substitute source of protein. This study aims to test the effect of replacing fish meal with BSF (Hermetia illucens) maggot meal in the diet on growing quail carcasses. This research used a 60-7-dayold quail with an initial body weight of 22.25 ± 4.23 g and reared for 35 days in the Animal Husbandry Study Program cage, Djuanda University, Bogor. The design used was a completely randomized design with five treatments and four replications consisting of R0= Ration composed of 0% maggot meal and 16% fish meal, R1= Ration consisting of 4% maggot meal and 12% fish meal, R2= Ration composed of 8% maggot meal and 8% fish meal, R3 = Ration consisting of 12% maggot meal and 4% fish meal, R4 = Ration composed of 16% maggot meal and 0% fish meal. Data were analyzed using ANOVA and Duncan's test. The variables observed were slaughter weight (g), carcass weight (g), carcass percentage (%), breast percentage (%), wing percentage (%), thigh percentage (%), and back percentage (%). The research results showed that the substitution of fish meal for maggot meal at the 16% level had a significant difference (P˂0.05) in slaughter weight, carcass weight, breast percentage, and back percentage. However, there was no significant difference (P˃0.05) in carcass percentage, wing percentage, and thigh percentage. Substituting fish meal with maggot meal at a 4 – 16% level cannot increase the carcass percentage in growing quail. [ABSTRACT FROM AUTHOR]