This experiment was conducted to study the nutritional and economical evaluation of inclusion of hotels leftover food in growing lambs rations. Fifteen crossbred lambs (Ossimi × Finnish) with 23.5±0.3 kg average live body weight of, and 7 months of age were distributed into 3 similar groups (5 lambs each) and randomly assigned to 3 experimental rations. The experimental rations were formulated from concentrate feed mixture (CFM) that partially substituted by 0, 25 and 50% of dried leftover food (DLF) for CFM1, CFM2 and CFM3, respectively, plus corn silage. The experiment lasted 120 days. Results indicated that most nutrient digestibilities were markedly improved with increasing level of DLF in ration. Feeding values expressed as DCP did not significantly differ among the experimental rations, while TDN values were significantly improved with increasing the level of DLF. Ruminal pH values were significantly decreased with increasing DLF level at 3 hrs post feeding, however, concentrations of ruminal NH₃N and TVFA´s were not affected by inclusion of DLF. No significant differences were observed in blood constituents among the experimental groups. Moreover, improving in average daily gain and the lowest feed cost to get one kg gain were observed with ration containing 50% DLF (R3), recording 10.97% and 12.44%, respectively. At the same time, the positive percentage of DLF gave the highest economic efficiency. It was concluded that inclusion of DLF in growing crossbred lambs' rations up to 50% in CFM improved their performance.