Bio-char, a by-product from fast wheat straw pyrolysis, was investigated as adsorbents for the removal of cationic dye, neutral red (NR) from solution. Adsorption studies were performed at bio-cha dose, NaCl concentration, contact time and dye concentration in the batch mode. Salt coexisted in solution is not favor in adsorption and the adsorption is faster process. The equilibrium data are modeled with Langmuir and Freundlich equations and both models are better fitted. Thermodynamic parameters are calculated and the results show that the process was spontaneous and endothermic in nature. Bio-char can be used to remove cationic dye from solution.