Abstract: The present study was conducted at Laboratory of Seed Technology Research Unit, Mansoura, Seed Technology Research Department, ARC, Egypt during 2013. Organic acids are known for their antibacterial and antifungal properties. The purpose of the research was to study, the effect of salicylic acid and benzoic acid and propionic acid treatment on rice seed germination, vigor and infestation with fungi. Seed samples cultivars Giza 178, Giza 177 and Sakha 106 were soaked with organic acid solutions at concentrations 10, 15, 20 mM and control were soaked in distilled water for 24 h to each treatments. Giza 178 cv. gave the highest results of seed and seedling vigor characters followed by Giza 177 cv. and Sakha 106, respectively. Seed treatment with salicylic acid 15 mM was the best treatments followed by benzoic acid 10 mM and propionic acid 15 mM recorded the highest values of seed germination, seed and seedling vigor as concentrations. SA reduced seed infestation with fungi with increasing concentrations followed by propionic acid and benzoic acid, respectively. However, increased to propionic acid concentration were negatively affected seed germination and vigor with all cultivars.