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The water resources pollution by municipal and industrial wastewater is a considerable problem. In this research, the efficiency of Holly, Sallow and Poplar sawdust as simple, economic and abundant materials were studied for the removal of cyanide from aqueous solutions. The synthetic polluted water samples were prepared by using of sodium cyanide in distillation water with concentration of 10, 30 and 50 mg L-1 and effects of saw dust size (mesh of 20 and 70) and contact time (10-140 min) were studied. The results showed that the sawdusts had a uniform efficiency (60-70% and 71-83%) at 30 and 140 min. respectively. Also obtained results showed a direct relation with contact time and cyanide concentration and reversed relation with sawdust particle size. The results showed that the optimal contact time is 30 min. In this condition, the averages of adsorption capacity were obtained 1.25-1.38 and 1.34-1.52 mg CN/g sawdust for mesh 20 and 70 respectively. Based on the results, its availability and cheapness, the application of sawdust as an absorbent for the removal of cyanide from aqueous solutions is recommended.