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The adsorption of a mono azo dye methyl-orange (MeO) onto granular pinecone derived ACTIVATED CARBON (GPAC), from aqueous solutions, was studied in a batch system. Seven two-parameter isotherm models Langmuir, Freundlich, Dubinin-Radushkevic, Temkin, Halsey, Jovanovic and Hurkins-Jura were used to fit the experimental data. The results revealed that the adsorption isotherm models fitted the data in the order of Jovanovic (X2= 1.374)> Langmuir> Dubinin-Radushkevic> Temkin> Freundlich> Halsey> Hurkins-Jura isotherms. ADSORPTION ISOTHERMS modeling showed that the interaction of dye with ACTIVATED CARBON surface is localized monolayer adsorption. A comparison of KINETIC MODELS was evaluated for the pseudo-second order, Elovich and Lagergren KINETIC MODELS. Lagergren first order model was found to agree well with the experimental data (X2= 9.231). In order to determine the best-fit isotherm and KINETIC MODELS, two error analysis methods of Residual Mean Square Error and Chi-square statistic (X2) were used to evaluate the data.