Textile industry is one of those industries that discharge great amounts of effluents with syntheticrndyes to the environment causing public concern. Reactive dyes are applied in textile industriesrnwhich causes severe problem of water pollution and treatment. This study investigates thernpotential use of low cost clay soil for the removal of reactive red dye from aqueous solution.rnThe clay soil washed repeatedly until the dirt was eliminated. Then, it was heated at 105Â°C forrn24hrs and activated with H2SO4 in order to increase adsorption sites. The clay soil wasrncharacterized for its physicochemical properties. The effects of solution pH, adsorbent dose,rninitial dye concentration and contact time at room temperature were studied in batch adsorptionrnexperiment. Mechanism of adsorption was studied using isotherm and kinetic models .Therninteraction effect of process parameters and optimization were studied using response surfacernmethodology.rnExperimental results have shown that, adsorption capacity was found to increase with higherrninitial dye concentration and lower solution pH. Maximum adsorption capacity of reactive redrndye was found at pH 1 and optimum time of 120min. Langmuir, Freundkich, D-R isothermrnmodels were investigated and the result showed that the adsorption process was most fitted to thernLangmuir isotherm model giving correlation coefficient of 0.985.The calculated adsorption freernenergies from the D-R isotherm model 12.9kJ/mol indicated that the Adsorption processrnproceeds via chemisorptions. The kinetic study showed that Pseudo second-order model bestrndescribed the kinetics of adsorption which confirmed the adsorption process was chemisorptions.rnThe optimum condition for reactive red dye removal was found at pH 1.5, 40 mg/L of initial dyernconcentration 4 g/100 ml of adsorbent dose and contact time of 120 minutes. The results showedrnthat clay soil has the potential to be applied as adsorbent to remove textile dye from textilernwastewater.