We report new experimental liquid-liquid equilibrium data for the ternary mixtures water + methanol + n-amyl acetate and water + ethanol + n-amyl acetate at 25, 35 and 45 degrees C, together with the results of fitting the data with UNIQUAC equations. The activity coefficients of water and the alcohol in water + (methanol or ethanol) mixtures were calculated using UNIQUAC parameters obtained from experimental data for each of a number of ternary mixtures including water and the alcohol in question.