The potential of nonliving Gracilaria persica as biosorbent in removal of Cadmium and Pb metal solution was determined. Apparently, the pseudo-second and mixed order models represented the kinetics of biosorption of Lead and Cd ions onto G. persica particles slightly better than the pseudo-first order model, although the first order model also represented the data reasonably well. The first order rate constant were found as k1=0.004 h-1 (R2=0.98) for Cd and k1=0.003 h-1 (R2=0.99) for Pb. The removal of test metals by algal biomass is very efficient at the start of the process. Pb and Cd sorption followed the Freundlich model more clearly than the Langmuir model. The relatively lower value of Kf for Cd than for Pb sorption by G. persica biomass implies that Cd binding by the test alga was stronger than the binding of Pb. Results clearly that the removal process was highly dependent on the pH of the metal solutions. Results obtained in this study have shown that G. persica is a good adsorbent for Cadmium and Pb elimination even at high metal concentration.\n Key words: Cadmium, Lead, Gracilaria persica, Removal, Biosorption. \nINTRODUCTION \nIn recent years, heavy metal pollution has become one of the most serious environmental problems. Presence of heavy metals in some chemical industry wastewaters adversely affect the performance of biological treatment systems and also cause considerable toxic effects on the receiving environment (Karagi and Cilka, 2006).For this reason, removal and recovery of heavy metals from industrial wastewaters before biological treatment has gained significant attention in recent years.\nUncontrolled discharge of heavy metal containing wastewaters to the environment can be detrimental to humans, animals and the plants. The maximum cadmium and Pb uptake recommended by World Health Organization is 3 µg/L and 10 µg/L in drinking water (Wase and Forster, 1997). This is the main reason why it is necessary to find a technology to remove these compounds, especially from wastewaters.\nBiosorption in natural or uncontrolled situations typically involves a combination of active and passive transport mechanisms starting with the diffusion of the metal ion to the surface of the microbial cell. Once the metal ion has diffused to the cell surface, it will bind to sites on the cell surface which exhibit some chemical affinity for the metal (Aksu, 2005).\nDifferent methods were developed for removal of heavy metals from wastewater (Karagi and Cilka, 2006). Chemical methods require high capital and operating costs and may produce large volumes of solid wastes (Aksu, 2005).For this reason, biomaterials sorption been employed as a technique for heavy metal elimination. Any sorbent is considered as a low cost material if it is easily obtained and abundant in the environment. Algae are considered to be very good low cost sorbents, as many works have demonstrated high uptake capacities,