The objective of the present study was to evaluate the potato by-product (PB) and tomato pomace (TP) as unusual feedstuff in broiler diets in terms of performance and carcass characteristics. A total number of 504 one day old male Ross broiler chicks were used in the experiment. The by-products were added to the experimental diets at 8, 16 and 24 % of the diet. After that, the experimental diets were divided into two groups. The first group was supplemented with enzyme mixture while the other group was free of enzyme supplementation. Two control diets were also used as positive and negative control. Each dietary treatment was fed to 3 replicates of 12 chicks each up to 35 days of age. The results of the experiment showed that significantly lower body weights and weight gain were recorded for the two groups fed 24% potato by-product with or without enzyme supplementation when compared to their respective controls. On the other hand, no significant differences in body weight and weight gain were observed for the birds fed Tomato pomace (TP) at different replacement levels compared to their respective control groups whether the birds fed diets supplemented with enzyme or not. All the groups fed TP at different replacement levels, whether supplemented or not with enzyme and the groups fed PB (8%) and PB (16%) without enzyme recorded significantly higher feed intake in comparison with their respective control group. Non significant differences were obtained among different groups for carcass parameters. The addition of enzyme enhanced in general the numerical values of chicken performance parameters. It could be concluded that either potato by-products (PB) or tomato pomace (TP) could be incorporated into broilers' diets by replacement levels up to 16%. The negative effect of high fiber content on chickens' performance could be avoided by addition of fiber degrading commercial enzyme to the diets.