The presence of metallic ions in water bodies is of great concern because their presence and accumulation have a toxic effect on living species. Conventional methods for toxic metal removal include oxidation, reduction, precipitation, membrane filtration, ion exchange, electrolytic recovery, biological treatment, and adsorption The adsorption process is being widely used by various researchers for the removal of heavy metals from waste streams. In the present investigation, removal of Cu(II) from aqueous solution by the process of adsorption has been considered. Neem leaf powder (NLP) has been used as adsorbent. The influence of metal concentration, and adsorbent concentration on the extent of adsorption has been studied