Hexavalent chromium, amongst others, is a globally environmental concern when eluded beyond limited. This work was then focused on the removal of hexavalent Cr (VI) heavy metal ion from wastewater using an adsorbent prepared from a banana peel. Banana peel was activated using furnace at 450 °C, with 50% and for 2 hrs. BET, FTIR, SEM, and TGA measurements were used to describe the activated banana peel. These characterization results indicated that the activated banana peel has a good surface area of 200m 2 /g and porous surfaces that are main parameters for adsorption. With contact time, pH, adsorbent dose, and initial concentration, the removal efficiency was inspected. The adsorption process was adjusted, and it was discovered that a contact time of 92 minutes, pH of 3, adsorbent dose of 1.5 g/L, and an initial concentration of 38 mg/L were the finest operating conditions for removing 94 percent Cr (VI). Adsorption kinetics and isotherms were also studied. Pseudo first order with R-square of 0.996 and Langmuir isotherm model with R-square of 0.997 were found to be the best models to mathematically represent the rate and behavior of adsorption of Cr (VI) of the surface of activated banana peel. The reusability of the activated banana peel was tested and it was observed that it can be used for 6 times before its removal efficiency declines below 70%. In addition of synthetic wastewater, a real wastewater test has been made to see the efficacy of the banana peel activated carbon. It was unfolded that the Cr(VI) chromium concentration of the tannery wastewater reduced to standards set. Keyword: Banana Peel, Activated Carbon, Adsorption, Optimization, Cr(VI)