This study evaluated the effects of graded levels of neem (Azadirachta indica) leaf powder on growth performance, gut microbial count, digestible feed kinetics, vital organs, and intestinal characteristics of Arbor Acre broiler chickens. A total of 100 dayold mixed-sex Arbor Acre broiler chicks were randomly allotted to five dietary treatments in a completely randomized design. The treatments consisted of a control diet without neem leaf powder and diets supplemented with 0.3%, 0.4%, 0.5%, and 0.6% neem leaf powder. The feeding trial lasted for 42 days. Data were collected on growth performance, microbial count, gastrointestinal parameters, vital organ weights, and intestinal morphology, and were subjected to one-way analysis of variance. The results showed that dietary neem leaf powder had no significant effect (p > 0.05) on initial weight, final weight, weight gain, feed conversion ratio, digestible feed kinetics, or vital organ weights. However, feed intake differed significantly (p < 0.05), with the control group recording the highest value and birds fed 0.5% neem leaf powder recording the lowest value. Total bacterial count and faecal contaminant count were significantly affected (p < 0.05) by dietary treatment, while total fungal count and total coliform count were not significantly different. Significant differences (p < 0.05) were also observed in jejunum and ileum lengths, suggesting possible improvement in intestinal development in neem-supplemented birds. No growth of Escherichia coli and Salmonella was observed during microbial incubation. The findings indicate that neem leaf powder can be included in broiler diets up to 0.6% without adverse effects on growth performance or organ development. Neem leaf powder may also contribute to gut microbial modulation and improved intestinal characteristics. Therefore, neem leaf powder has potential as a natural phytogenic feed additive and possible alternative to antibiotic growth promoters in broiler production