Isothermal vapor-liquid equilibrium data for the system methanol + water + ammonium bromide at four salt molalities {(0.500, 1.000, 2.000, and 4.000) mol center dot kg(-1)} have been measured with the help of headspace gas chromatography at (298.15 and 313.15) K. The experimental data were correlated using the electrolyte nonrandom two-liquid model and the extended universal quasichemical model.