Adsorption process takes place by lead ions getting adsorbed on fly ash. Forces of attraction exist between lead and fly ash due to these forces of attraction, heat energy is released. Every year, industry produces about 2.5 million tons of lead throughout the world. Most of this lead is used for batteries. When the body is exposed to lead by being inhaled, swallowed, or in a small number of cases, absorbed through the skin, it can act as a poison. In this study, the removal of lead (II) ions from aqueous solution by using fly ash was investigated. For this purpose, various factors affecting the removal of heavy metal ions, such as treatment time with the solution, initial pH with the solution and adsorbent size were investigated. The metal ion removal capacities of fly ash increased with increasing pH, and pH 6 was found to be the optimal pH value for maximum metal removal capacity. Lead ion adsorption and equilibrium could be achieved within one hour of time is 90.37. Maximum capacity of lead removal could be achieved at 52μm. Adsorption data of the fly ash were modeled by the first order kinetics in order to investigate the lead adsorption mechanism.