The research was aimed to evaluate effect of palm oil sludge fermented by using Trichoderma Harzianum molds on Body Weight Gain and Feed Efficiency of Bali Pigs. The experiment was set up in a completely randomized design with five levels of treatment and three replications. The treatment levels were R0 (without palm oil sludge), R1 (5% fermented palm oil sludge), R2 (10% fermented palm oil sludge), R3 (15% fermented palm oil sludge), R4 (20% fermented palm oil sludge). Results of the research showed supplementation of 15% fermented palm oil oil sludge significantly affected on body weight gain and feed consumption, as well as feed convertion (P<0.01).