Isobaric vapor-liquid equilibrium for ethanol (1) + water (2) + cobalt(II) chloride (3) at different mole fractions of cobalt(II) chloride has been measured at 100.0 kPa. The results in the range where the mole fraction of salt in the liquid phase was less than 0.23 times the mole fraction of water were correlated by assuming that the salt was in ionic form and was associated only with the water. Thermodynamic consistency was checked by Herington’s method with satisfactory results.