The existing conventional methods are not economically feasible. Discharging of wastewater contaminated with textile dye has been a serious environmental problem. The removal of dye from textile wastewaters plays a great role in environmental protection. In this study, batch adsorption of acid yellow dye from textile wastewater has been carried out at room temperature on a laboratory-scale using activated water hyacinth and activated bone char as a low-cost adsorbent. The objective of this study was to investigate the removal performance of acid dye using activate water hyacinth and activated bone char adsorbents. The dye removal performance was measured using UV Visible spectrometer. The adsorbents were characterized using FTIR, and SEM to study the functional groups and surface morphology of the adsorbents before and after adsorption. Adsorption experiments were carried out in a batch process at different operating experimental parameters of the initial concentration of dye, adsorbent dose, contact time, and solution pH. The adsorption models (adsorption isotherm, and adsorption kinetics) of acid yellow dye onto the activated water hyacinth root powder and animal bone char adsorbents were also studied. From the experimental data, the dye maximum removal efficiency of 92.26% was achieved at pH 2, 50 mg/l initial dye concentration, 120 min contact time, and 2 g adsorbent dose for activated water hyacinth, on the other hand, the maximum dye removal efficiency of 91.92% was achieved at pH 2, 50 mg/l initial dye concentration, 120 min contact time, and 2 g adsorbent dose for activated bone char. It was also found that acid yellow dye removal was increased with the increment of the adsorbent dosage and contact time until equilibrium reached. The experimental results have been fitted well by the Langmuir isotherm model with significantly high correlation coefficients of 0.9531 and 0.9245 for AWH and ABC, respectively. The adsorption kinetics data for both adsorbents followed the pseudo-second-order model R2 = 1 for both AWH and ABC. Activated water hyacinth showed better removal performance of dye than activated bone char. This study indicated that both activated water hyacinth and activated bone char which are locally available, and inexpensive have the potential to remove acid yellow dye from textile wastewater.