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The efficacy of grinded watermelon seed as alternative low-cost biosorbents for the removal of Pb (II) ions from aqueous solutions was investigated. Batch adsorption studies were carried out by preparing a simulated waste sample and effects of adsorbent dose, temperature, initial metal concentration, contact time and pH on the percentage Pb (II) removal were evaluated. The Freundlich constant (n) and separation factor (RL) values suggest that the lead ions was favourably adsorbed onto biosorbents. Pseudo-second order kinetics best described the process with R2 (0.997). The results of pseudo second order kinetic model for the adsorption of lead showed straight line graph which starts from the origin. The value 1/n greater than 1 is indicative of cooperative adsorption and Freundlich isotherm. Watermelon seed has viable characteristics for preparing biosorbents.