Liquid liquid equilibrium (LLE) data for the ternary system water + cyclohexene + cyclohexanol were determined at atmospheric pressure and at high pressure over the temperature range of (303.2 to 403.2) K. The accuracy of the high pressure apparatus was verified by duplicating the literature data. The measured LLE data were compared with the values correlated by the nonrandom two-liquid (NRTL) model. The NRTL model was successfully fitted to the new experimental data.