Total pressure measurements are reported for chloroform + acetone + 2-butanone, chloroform + 2-butanone, and acetone + 2-butanone at 303.15 K. The results were obtained using a Van Ness apparatus and were fitted to a flexible correlating expression for the excess Gibbs free energy of the liquid phase using Barker’s method. This expression represents the measured pressures for the ternary system with an average deviation of 0.03 kPa. The applicability of the NRTL equation to this system is examined, and it is found to predict the ternary results with an average deviation of 0.07 kPa.