In view of the current shift towards the use of growth promoters of natural origin, this study was carried out to determine the effects of feeding onion and garlic on some performance characteristics (body weight, feed intake, water intake, feed conversion ratio, feeding cost and carcass yield) of broiler chickens. A total of 104,4 weeks old broiler chickens were divided into 2 equal groups of 62 birds each at random (one for onion and the other for garlic) and used in the study. The result of the study revealed that garlic and onion significantly (p