Agricultural or lignocellulosic waste needs suitable management approaches. This study explores the potential of Polyalthia longifolia waste leaves(PLL) as a low-cost adsorbent for the removal of Basic Violet 14 dye from aqueous solutions. The leaves waste was collected, dried, powdered and characterized using FTIR and SEM analysis. Batch adsorption experiments were conducted to evaluate the effect of contact time, initial dye concentration, adsorbent dose, pH and temperature on the adsorption capacity. Equilibrium data fitted well with Langmuir isotherm model indicating monolayer coverage of dye onto a homogenous adsorbent surface. Pseudo-second order kinetic model showed good correlation, suggesting chemisorption being the rate-limiting step. Negative values of ∆G° and ∆H° indicated spontaneous and exothermic nature of adsorption. The maximum monolayer adsorption capacity was found to be 122 mg/g. Over 90% desorption of dye was achieved using methanol. This study reveals that PLL can be used as a low-cost adsorbent for removal of dye.