This study was conducted to investigate the effect of feeding diets containing different levels of parsley on the hematological traits of local Iraqi geese. A total of twenty-four local geese, one year old, were used in this experiment. The birds were allocated into four treatment groups, consisting of six geese each. Treatment groups were: control diet (C) (free from parsley); T1: control diet + 80 g/d parsley; T2: control diet + 160 g/d parsley; and T3: control diet + 240 g/d parsley. At the end of the experiment, blood samples were obtained from all geese from the brachial vein by venipuncture. Hematological traits included in this study were red blood cells count (RBC), hemoglobin concentration (Hb), packed cell volume (PCV), mean cell volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), thrombocytes count, white blood cells count (WBC) and percentages of heterophils, lymphocytes, monocytes, basophils and eosinophils and heterophils/lymphocytes (H/L) ratio. Results revealed that supplementing the diet of geese with different levels of parsley (T1, T2, and T3) resulted in a significant (P<0.05) increase in Hb, PCV, MCV, MCH, MCHC, thrombocytes, WBC, and lymphocytes and a significant (P<0.05) decrease in H/L ratio and eosinophils in comparison to the C group. Whereas, there were no significant (P > 0.05) differences among all experimental groups as regards heterophils, monocytes, and basophils. However, the T3 group surpasses other treatment groups (C, T1, and T2) concerning RBC count, while there were no significant differences among the C, T1, and T2 groups with respect to RBC count. In conclusion, supplementing the ration of geese with parsley resulted in significant improvement in most of the blood traits involved in this study.