A study was conducted to investigate the effect of two dietary herbal plants (fenugreek seeds (F), marjoram leaves (M) and their combination (F+M)) supplementation on productive performance and carcass traits of New Zealand White rabbits (NZW). The herbal plants were dietary added for 8 weeks at the following levels: T1 (0% F+0% M), T2 (0.25%F), T3 (0. 25%M), T4 (0.50%F), T5 (0.50%M), T6 (0.25% F+0.25% M), T7 (0.50% F+0.25% M), T8 (0.25% F+0.50% M) and T9 (0.50% F+0.50% M). Ninety unsexed rabbits at 6 week of age (750-775g initial body weight) were divided into 9 treatment groups. Each treatment had 10 rabbits. At the end of the feeding traits, no significant differences were observed in LBW of rabbits comparing with the control group. However, group 4 which fed fenugreek (0.50%) achieved the highest final LBW at 14 weeks of age. During the whole period, means of feed consumption of rabbits were not significantly different among experimental groups. Concerning feed conversion ratio (FCR) for the whole experimental period, there were no significant differences among all groups. Herbal plants supplementation had no significant effect on relative weights of carcass yield, liver or heart. Generally, the present study concluded that the consumption of fenugreek and marjoram had positive effects on rabbit's performance and carcass traits of growing NZW rabbits.