A study was conducted to determine the effect of feeding graded levels of boiled sorrel seed meal (BSSM) on the performance of cockerels. Two hundred (200) one week old cockerels were randomly assigned to five dietary treatments with four replicates each in a completely randomized design. The treatments had 0% (control), 5%, 10%, 15% and 20% inclusion levels of BSSM in the experimental diets. Growth performance, cost analysis, heamtological and serum biochemical indices formed the response criteria. Feed and water were provided ad libitum throughout the 14 weeks experimental period. Feed consumption, body weight, body weight gain, FCR were significantly (P<0.05) better in the group with 20% inclusion level. Feed cost and cost/kg gain were significantly lowered with inclusion of BSSM in the in the diet. Red blood cells (RBC), white blood cells (WBC), heamoglobin (Hb) and packed cell volume (PCV) were significantly (P<0.05) higher at 20% inclusion level. Feeding BSSM to cockerels had no adverse effects on serum biochemical indices. It was concluded that up to 20% BSSM can be included in to cockerel diets without compromising performance.