An agro-waste, coco-peat was investigated as a biosorbent for methylene blue from aqueous solutions. The practicability of biosorption process was examined by varying the experimental parameters such as pH (2-9), initial concentration (50-200 mg/L), contact time (2-240 min), and temperature (298-318 K). Maximum uptake of 212.8 mg/g was observed at pH 8 based on the Langmuir model. Among different isotherm models examined (Langmuir, Freundlich, Redlich-Peterson, and Sips), the Redlich-Peterson model described the experimental isotherms well. Coco-peat was characterized using the Fourier Transform Infrared Spectroscopy and their morphology was analyzed using scanning electron microscopy.