Isothermal vapor-liquid equilibrium (VLE) data at 60 degrees C for the acetone-water-salt system were obtained using headspace gas chromatography. Three different salts were investigated in this study; NH4Cl, NaCl, and CaCl2. The results obtained showed that although the alteration in the VLE of the acetone-water system in the presence of any 0.5 M salt was very small, the three salts had a salting-out effect on acetone. On the other hand, significant alteration in the VLE was obtained when NaCl was added under saturation conditions. Good agreement with the Furter equation was observed for the experimental data with unsaturated NaCl salt. The salt effect parameter, obtained from the Furter equation, was found to be a function of the liquid concentration.