Isothermal vapor-liquid equilibrium data for the system methanol + benzene + sodium tetraphenylborate at five salt molalities [(0.05, 0.10, 0.15, 0.20, and 0.25) mol center dot kg(-1)] have been measured with the help of headspace gas chromatography at (298 and 308) K. The experimental data were correlated using the electrolyte nonrandom two-liquid model.