Background: Nowadays, water pollution by toxic elements has become a universal environmental issue. Lead, as a toxic element, is approximately enhanced in the environment by industrial development. The potential risk of lead to health has attracted the interest of researchers to eliminate it from contaminated water. Objectives: In the present study, a dithizone-modified bagasse adsorbent, used for removing lead ions from aqueous solutions, was successfully prepared. Methods: The prepared adsorbent was characterized by FT-IR and XRD techniques. The adsorptive properties of adsorbent were studied at room temperature. Different parameters like pH value, solution concentration, adsorption time, and amount of adsorbent were optimized. Results: Results show that the adsorption of lead on dithizone-modified bagasse fitted well to the Freundlich isotherm equation following the Langmuir isotherm. The maximum removal efficiency was obtained to be more than 99.5% in a short contact time (1.0 minutes) at pH 6. The loading capacity was studied and obtained to be 37.20 mg g -1 . The adsorption process was replicated for 4 times without a considerable loss in its efficiency (> 95%). Conclusions: High efficiency at a short time, recyclability, and biodegradability are the main advantages of this adsorbent. The proposed method is cost-effective and environmentally friendly.