In this study, the efficiency of an adsorbent composed of consumed coffee grounds residue (CCGR), modified using a basic medium of sodium hydroxide (NaOH), was evaluated for the removal of Methylene Blue dye (MB) from its aqueous solution via a batch adsorption process. The effects of various physical variables, such as initial dye concentration, adsorbent mass, and contact time, were tested on the adsorption process under constant physical conditions, including a room temperature of (26±2) oC, a pH of (6.5), a shaking speed of 200 rpm, and a solution volume of 50 ml. The results showed that the adsorption process for removing (MB) was highly satisfactory under the following conditions: an initial dye concentration of 110 mg/l, an adsorbent mass of 0.25 g, and a contact time of 20 minutes. Furthermore, a clear correlation was found between the initial dye concentrations (Ci) and the resulting increase in adsorption capacity (q), indicated by a correlation coefficient (R2) = 0.982. This demonstrates that the maximum adsorption capacity (qmax) values obtained experimentally are in good agreement with the calculated values regarding the linear form of the Langmuir isotherm model. Based on this model, it was concluded that the (qmax) (representing a monolayer homogeneous adsorption) of the modified spent coffee grounds was calculated to be 43.48 mg/g for dye adsorption................. Keywords:................. Adsorption, Methylene Blue Dye, Batch Mode Adsorption, Isotherm