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In this work, the ability of eggshell treated orange peel as a low-cost adsorbent to remove malachite green (MG) dye from an aqueous solution was investigated. The eggshell treated orange peel was characterized by using Fourier transform infrared (FTIR) spectroscopy analysis. From the FTIR analysis, the functional group that might be involved in the adsorption process was found to be carboxylic acid and alcohol. The effect of contact time, initial dye concentration and adsorbent dosage were also investigated by using batch adsorption mode. The results showed that the percentage of dye removal increased with the increase of contact time and the process attained equilibrium within 140 minutes with the highest percentage of MG dye removal was 98%. The percentage of dye removal was also found to increase with the increase of initial dye concentration and adsorbent dosage. The experimental result showed that 0.1 g eggshell treated orange peel was able to remove 98% of MG dye while about 99% of MG dye was removed for 250 mg/L of dye concentration. The adsorption isotherm data were well fitted to the Langmuir isotherm model with the qmax of 31.45 mg g−1. Meanwhile, the kinetic data was best presented by the pseudo-second-order model with R2> 0.99. [ABSTRACT FROM AUTHOR]