Abstarct: Contamination of water resources with petroleum products is of environmental problems in the recent years. The current study was carried out to investigate the using raw and heat modified red mud as adsorbent to remove insoluble fraction of gasoline in aqueous solution. The parameters such as pH, contact time, adsorbent dose and initial concentration were optimized in sorption process to obtain the highest removal. Maximum removal of gasoline by raw and heat modified red mud at the following conditions of pH at 8 and 7 and adsorbent dose of 50 and 100 g/L were 90% and 92% respectively while contact time of 30 minutes and 1% initial concentration of gasoline were the same for both adsorbents. Results of isotherm studies for raw and heat modified red mud showed high consistency with Langmuir and Frundlich isotherms, respectively. The kinetics of adsorption process was described by a pseudo-second-order model for both adsorbents. According to the results, the adsorbents used in this study, have an appropriate efficiency for removal of the non-soluble fraction of gasoline from aqueous solution.