Abstract: In the present study, natural and treated skin almonds were used as adsorbents for adsorption kinetics of methyl orange (acid dye) and crystal violet (basic dye). Skin almonds were treated by three different types of chemical treatments: acidic treatment (H2SO4), alkaline treatment (NaOH) and salt treatment (MgCl2). The maximum adsorption capacities of crystal violet onto skin almond and methyl orange onto natural and treated skin almond with H2SO4 were 85.47, 15 and 31.94 mg g-1, respectively, at 23°C. Untreated skin almonds might be a good adsorbent for the removal of basic dye from water solution. The fitness of both Langmuir and Freundlich adsorption model on describing the equilibrium isotherms of Crystal Violet (CV) and Methyl Orange (MO) were examined. The experimental data fitted very well the pseudo second order kinetic model and also followed by intraparticle diffusion model. The results show that the sorption capacity decreases with an increase in solution temperature from 23 to 50°C. The thermodynamics parameters were evaluated. The negative value of enthalpy (ΔH°) indicated that the adsorption of both dye onto skin almonds were exothermic, which result was supported by the decreasing adsorption of dye with temperature.