Mustard husk is a by-product of agriculture industry and widely available as a waste. The mustard husk biomass has been reported to exhibit excellent adsorption capacities in removing heavy metal ions [24]. Yet, this potential biosorbent has not been applied for remediation of dye-laden wastewaters. To the best of our knowledge, our review has revealed less than three papers published on the removal of Alizarin Red S by adsorption using waste biomass. Hence, as a novelty and in view to fill in the paucity of published data on the use of biomass based adsorbents for removing Alizarin Red S, in the present study, the removal of chemical grade Alizarin Red S was studied by using mustard husk.