In this article, isobaric vapor liquid equilibrium (VLE) data for three binary systems of acetaldehyde + ethanol, acetaldehyde + ethyl acetate, and acetaldehyde +1-butanol were determined using a modified Rose Williams equilibrium still at 101.3 kPa. The experimental data were confirmed by the area method of Herington and point-to-point method of Van Ness. Activity coefficient models, Wilson, NRTL, and UNIQUAC were employed to correlate the experimental VLE values. Both models showed a good agreement and the binary interaction parameters were estimated.