An experiment was conducted to study the growth performance of Cobb broilers as supplemented by varying levels of fermented rice-washed water. This experiment was conducted at Sto. Nifio, San Simon, Pampanga from May 14, 2022 to June 14, 2022, The experiment was laid out according to the procedures of Completely Randomized Design with three replications. A total of one hundred twenty-day-old broiler chickens were randomly distributed into four treatments: Tl = control (plain water), T2 - 10 ml FRWW, T315 ml FRWW, T4 -20 ml FRWW. The results showed that applying fermented rice wash water enhanced the growth performance of broilers. In comparison to the control group, the birds given treatment with fermented rice wash water performed better. The broiler chicken supplemented with fermented rice-washed water obtained a higher net income and lowest cost of production compared to the control group that obtained the lowest net income and the highest cost of production.