A pot experiment was conducted in order to study the effects of plant mycorhizal inoculation on the response of sorghum genotypes to salinity. The experiment was arranged as factorial in a randomized design with three replications. In this study 10 sorghum genotypes were tested under two levels of salinity (0 and 100 mM Nacl) and two inoculation treatments (mycorhizae and control). The interactions between salinity, mycorhizae inoculation and genotype were significant on the evaluated traits. The percentage of mycorhizal infection was decreased under saline condition and there was considerable variation among genotypes in this regard. Salinity also decreased root volume, cholorophyll content and shoot dry matter in all genotypes in both inoculated and non-inoculated plants, and photosnthesis, stomatal conductance, phosphurous, potassium, cartenoieds and leaf relative water content in most genotypes, especially in non-inoculated plants. However, salinity increased ionic leakage, sodium concentration, proline content and shoot/ root dry matter ratio. The activity of antioxidant enzymes, catalase and ascorbate peroxidase, was decreased under saline condition in half of genotypes but increased in the other half. Among tested genotypes, based on the reduction in shoot dry matter under salinity, IUA 28 was the most tolerant genotype to salinity in both inoculated and non-inoculated treatments. The inoculation of plants with mycorhizae increased photosnthesis, stomatal conductance, cholorophyll content, root volume, the activity of ascorbate peroxidase but decreased ionic leakage, sodium concentration, proline content and the shoot/ root dry matter ratio in most genotypes, especially under saline condition. The cartenoieds and leaf relative water contents of most genotypes increased under saline but decreased under none saline condition. The inoculation of plants increased catalase activity, potassium concentration, K/Na ratio in half of genotypes but decreased the values of these traits in the other half. Under saline condition, except for MGS5, the biomass yield was increased with mycorhizal inoculation and the extent of increase was geatest in MGS2 . Under non-saline condition, however, except for KGS33, plant growth was not imporoved by mycorhizal inoculation. The results of this experiment showed that the inoculation of plants by mycorhizae improved plant growth under salinity but decreased growth of some genotypes under non-saline condition.