Sulfuric acid (H 2 SO 4 ) and Sodium hydroxide (NaOH) treated mango seed sh ells, subjected to a one way activation scheme was employed to study the adsorption capacities, intensities and mode of coverage of synthetic (commercial) dye upta ke. Adsorption data obtained in this study indicate that the sorption of dye increases linearl y with initial dye concentration. The adsorption data fitted well into both the Freundlich and Langm uir isotherms as indicated by high correlation of determination (R 2 > 0.9) in both cases. Mode of surface coverage how ever was best predicted by the Freundlich isotherm (heteroge neity) for the home base activated carbon as does the Langmuir model (homogeneous coverage) for the reference commercial carbon. According to this study, percent dye removal (>64%) was reportedly estimated for derived biosorbent as against a fairly higher value (> 86) for the reference carbon. Proximity of generated data to those reviewed in literatures, is an indication that mango seed shells could compare, to a good extent with commercial activated carbon for organic dye removal from waste dyestuff.