A study conducted to evaluate the use of silver nanoparticles in broiler drinking water compared to graphene nanoparticles on carcass characteristics and immune organs%. 270 unsexed one-day old of Cobb 500 broiler chicks were divided into 9 treatments, each has 3 replicates with 10 broiler chicks. The tested nanoparticles treatments were (0.0, 2.5, 5.0, 7.5 and 10.0 ppm/L) drinking water of two types of nanoparticles (silver or graphene). At the end of experiment, the carcass traits and immune organs% of four birds per treatment were determined. The results showed that: No statistical differences between treatments were found on carcass characteristics (carcass, giblets, total edible parts and abdominal fat %) or carcass parts (breast, thigh, drumstick and wings %). No significant effects, related to nanoparticles (silver vs. graphene) utilization, were observed for the weight of spleen and bursa of fabricius. The obtained results showed that the supplementation of nanoparticles (silver vs. graphene) by different levels in broiler drinking water didn't affected carcass characteristics and immune organs%.