The present work was conducted at Laboratory of Seed Technology Research Unit, Mansoura during 2012 year to study the effect of dry heat treatments (50 ^oC , 60 ^oC , 70 ^oC and without heating) for (1 , 2 and 3 days) of some rice cultivars (Sakha 104, Sakha 103 and Giza 178) on seed quality. The obtained results showed that Giza 178 cultivar showed the highest results of seed and seedling vigor characters as compared with other cultivars. Dry heat of all cultivars under study at 60 ^oC for 2 days produced the highest mean of germination percentage, seed and seedling vigor. The lowest values of seed germination, seed vigor and seedling vigor of mentioned cultivars were obtained by heating at 70 ^oC for 3 days . The percentage of seeds infection with fungi decreased at 60 ^oC for two days , there was a decrease in Alternaria padwickii, Alternaria tenuis, Bipolaris oryzae with seed in all studied cultivars and elimination of Fusarium moniliforme, Fusarium semitectum, Helminthosporium sp, Rhizoctonia solani, Sarocladiumoryzae, Stemphylium botryosum with seed of  Sakha 103 and Giza 178 cultivars. Stepwise regression analysis revealed that A. padwickii, B. oryzae, F. graminearum, Fusarium semitectum, Helminthosporium sp,R. solani, Sarocladiumoryzae, as significantly contributing variables to variation in germination %. Furthermore, negative and significant correlation coefficient was recorded between germination %  and  A. padwickii , B. oryzae, F. graminearum . While the negative correlation coefficient between germination %  and  F. moniliforme, F. semitectum, R. solani, S.oryzae was not significant.   Finally, it could be concluded that heating of rice seed at 60 ^oC for 2 days is a good mean for controlling seed borne disease and enhancement of seed vigor.