Abstract: Background and Objective: Synthetic and semi-synthetic antibiotics as growth promoters are widely used in poultry production with some positive and negative effects and this has redirected research to natural antimicrobial products and plant leaves like neem leaf meal. The relevance of neem leaf meal as a growth promoter is due to its useful medicinal properties such as antibacterial, antiviral, antifungal, antiprotozoal, hepatoprotective, immunomodulatory and other peculiarities. This study therefore evaluated the effect of dietary inclusion of neem leaf meal (NLM) on the growth performance and carcass characteristics of broiler chickens. Materials and Methods: The feeding trial lasted for 8 weeks and a total of 192 day-old broiler chicks were used. The chicks were randomly allotted to four dietary treatments of 48 birds per treatment and replicated thrice with 16 birds per replicate in a completely randomized design (CRD). Four iso-caloric and iso-nitrogenous diets were formulated containing NLM at inclusion levels 0, 2.5, 5 and 7.5% for T1, T2, T3 and T4, respectively. Appropriate data on growth performance and carcass characteristics were determined and results subjected to one-way ANOVA accordingly. Results: Results showed the proximate composition of the NLM as 94 DM, 22.4 CP, 20.5 CF, 3 EE, 12.2 ash and 41.9% NFE. At the starter phase, performance traits like the average final weight, total weight gain, daily weight gain and feed conversion ratio were not significantly (p>0.05) affected by dietary treatments, with the exception of the average daily feed intake was significantly (p<0.05) different. All the parameters reduced in value across dietary treatments as the inclusion levels of NLM increased. At the finisher phase, the average total weight gain, daily weight gain, daily feed intake and FCR were significantly (p<0.05) influenced by dietary treatments. Generally, birds fed NLM beyond 2.5% inclusion level recorded poorer growth performance characteristics compared with the lower level (2.5%) and control diet. Results for carcass characteristics, cut-up parts and internal organs of broiler chickens fed NLM showed no significant (p>0.05) differences between treatments, implying that NLM might not adverse effect on the carcass characteristics. Conclusion: The study concluded that 2.5% NLM can be included in diets meant for broiler chickens without fear of compromising growth performance and carcass characteristics.