Abstract: Iron toxicity in rice plants may occur both in vegetative and generative phase. Each genotype shows different response to iron toxicity both in morphology and physiology. The objective of this study was to evaluate morphological and physiological responses as well as the level of tolerance of paddy genotypes to iron toxicity. This study was conducted at the greenhouse, Bogor Agricultural University from October-December 2012. The design was two factors completely randomized design with three replications. The results showed that there were significant differences among each genotype of the ethylene content, aerenchyma size, plaque content, Fe content in root, leaf bronzing and Fe content in the shoot. Based on several parameters, Indragiri was very tolerant genotype to iron toxicity as indicated by the highest ethylene content (116.71 nL g-1 wet weight h-1), the highest Fe content in roots (21271 ppm), the largest size of Aerenchyma (80230.11 nm), the highest plaque content (1864.12) and the lowest value of bronzing score (6). Base on the observations, it can be concluded that Indragiri genotype is very tolerant to iron toxicity, whereas IR64 genotype is very sensitive to iron toxicity.