Natural Doum fruit (DF) was prepared for studying its adsorption behavior as an effective natural adsorbent for removing Erichrome black-T (EBT) dye. In this study the adsorption was performed with different variables like initial concentration of the dye, contact time, pH, adsorbent dose, temperature, and agitation speed. The prepared DF powder has been characterized before and after adsorption of EBT by many analyses like XRD, SEM (Scanning Electron Microscopy), and FTIR (Fourier Transform Infrared Spectroscopy). Values of ΔG°, ΔH° and ΔS° were calculated as thermodynamic parameters. Langmuir, Freundlich and Temkin isotherm models are used to analyze the experimental data by using linear regression analysis. The Qmax (maximum sorption capacity) of EBT is 24.68 mg/g as calculated from experiments of the adsorption process. Pseudo- first order, pseudo-second order and intraparticle diffusion model were used to examine the mechanism of adsorption. The obtained result refers that; the adsorption of EBT dye from aqueous solutions with DF is effective process.