The present trial aimed to evaluate the influence of dietary fish oil and green tea powder and their combination productive performance in broiler chickens reared for 42 days. A total of 270 day-old male broiler chicks (Ross 308) were randomly assigned to one of nine dietary treatments with three replicates of ten chicks based on a completely randomized design. The feeding groups comprised a control diet without feed additive; diets containing only 1.0 or 1.5% of green tea powder; diets containing 1.5% of fish oil combined with 0, 1.0 or 1.5% of green tea powder; diets containing 2.0% of fish oil combined with 0, 1.0 or 1.5% of green tea powder. Supplementing fish oil, green tea powder or their combination affected broilers’ final body weight, feed intake as well as feed efficiency (P<0.05). Feeding a combination of fish oil and green tea powder resulted in a positive effect (P<0.05) on feed cost and production index. In conclusion, the findings reported in this study suggested that the dietary supplementation with a combination of fish oil and green tea powder supported productive traits in chickens.