Normal 0 The adsorption of Malachite Green (MG) cationic dye by AL- Hussainiyat deposit was firstly studied in a batch system for various dye concentrations. The adsorption was studied as a function of contact time, adsorbent dose, pH, and temperature under batch adsorption technique . The concentration of the solution before and after adsorption was measured spectrophotometrically . The equilibrium data fit with Langmuir, Freundlich models of adsorption and the linear regression coefficient R 2 was used to elucidate the best fitting isotherm model. Different thermodynamic parameters, like Gibb’s free energy, enthalpy and entropy of the on-going adsorption process have also been evaluated. The thermodynamic analyses of the dye adsorption on AL- Hussainiyat deposit indicated that the system was endothermic in nature .