The adsorption isotherms of benzene and methylbenzene vapors on activated carbon were obtained by a static volumetric apparatus. The measurements were done at 303.15, 313.15, 323.15, 333.15, and 343.15 K and pressures up to 7 kPa for benzene and 2 kPa for methylbenzene, respectively. The experimental data obtained were correlated by the UNILAN equation, which is generally used for heterogeneous adsorbents such as activated carbon.