Phase diagrams of mixtures consisting of (cyclohexane + cyclohexanone + dimethyl Sulfoxide) and (cyclohexane + cyclohexanol + dimethyl sulfoxide) were obtained at a temperature of 303.2 K. Nonrandom two-liquid and UNIQUAC models applied to both ternary systems produced interaction parameters that were well-correlated with the equilibrium compositions. These parameters enable the prediction of (liquid + liquid) equilibrium mixtures with either cyclohexanone or cyclohexanol.