Milk yield and quality of bali cows given supplementation of katu leaf (Sauropus androgynus L Merr) extract were investigated. A completely randomized design with three treatments and three replications were used in this experiment. The result showed, milk yield of bali cows in treatments B (0.5% w/bw supplementation of katu leaf extract) and C (0.1% w/bw supplementation of katu leaf extract) were respectively 43.22% and 9.63% higher than that of bali cows in treatment A (0% w/bw supplementation of katu leaf) (P>0.05%). Protein content, fat percentage, lactose content and total solids of milk of bali cows given katu leaf extract supplement were ranging from 3.42-3.55%; 6.37-6.67%; 3.77-3.93% and 16.67-16.95% respectively. There were no significant differences in protein, fat, lactose and total solid percentages of bali cows milk in treatments A, B and C (P>0.05) Keywords: milk yield, quality, bali cow, katu lea