Abstract: Background and Objective: The dominant content of crude fibre is cellulose and if it is used as a feed ingredient, cellulase enzyme must be added. The aim of this research was to investigate the effect of using sago waste with cellulase enzyme as a local feed ingredient on the production performance of broiler chickens. Materials and Methods: Three hundred Day Old Chickens (DOC) broiler strain CP 707 were kept in enclosed litter cages. There were 30 cage plots. The size of each plot was (1×1) m2. The cage wall was made of metal. The wall height was 0.5 m. Each plot was equipped with a feeding and drinking container. There were10 DOC broilers in every plot with six replications. The treatment for this research was sago waste with cellulase enzyme at 0.75 g kg–1 sago waste. The sago waste is added at levels of 0.00, 5.00, 10.00, 15.00 and 20.00% of total feed. The variables measured in this research were feed consumption, body weight gain, feed conversion, the abdominal fat weight, the percentage of abdominal fat and fatty meat. The data were analyzed by using a one-way ANOVA with a Completely Randomized Design and if there was a difference between treatments (p<0.05), Duncan’s New Multiple Range Test (DMRT) was used. Results: The results of this research show that the addition of sago waste with cellulase enzyme in the feed did not significantly influence consumption and fat content of the meat of 35 days old broiler chickens but did significantly influence body weight gain, feed conversion, the weight of abdominal fat and percentage of abdominal fat of 35 days old broiler chickens (p<0.05). Conclusion: Sago waste with cellulase enzyme as a broiler feed ingredient can improve body weight gain as well as decrease feed conversion, the weight of abdominal fat and the percentage of abdominal fat. It is more effective if it is used at a level of 15% of total broiler feed and it does not have a negative effect on feed consumption and fat content of 35 days old broiler chicken meat.