This paper present the efficiency of animal activated carbon in removal of methyl orange (MO) from aqueous solutions by adsorption. Batch experiments were conducted to study the effect of reaction parameters on the adsorption of the dye such as: contact time, initial concentrations of MB solution, adsorbent dosage, solution pH, and temperature. The surface properties were measured by some techniques including: Fourier transform infrared spectrometry and point of zero charge. Adsorption capacity for MO is 7.045 mg.g−1 at 298 K under the optimum condition of pH of 3, adsorbent dosage of 10 g.L−1, particle size of 0.2-0.05 mm, and contact time of 10 min. The kinetic data obtained from different experiments were analyzed usingthree kinetic models namely intra-particulate diffusion, pseudo-first-order and pseudo-second-order kinetics models. Among the kinetics models studied, the pseudo-second-order model was the best applicable model to describe the adsorption of MO onto activated carbon. Freundlich and Langmuir models were used to analyze the obtained experimental data. In comparison, both models were understood to be a better fit for the experimental data, this two models show best fit with R2 values of 0.999. The values of Gibbs free energy of adsorption ΔG°<0; this negatives values indicated the spontaneity of the adsorption process of MO onto activated carbon. The values of (ΔH°) and (ΔS°) were found to be −57.924 kJ.mol−1 and 198.538 J mol−1.K−1, respectively. The thermodynamics parameters indicated that the adsorption of MO onto activated carbon was spontaneous and exothermal.