Vapor pressures of (I-butanol + 1,8-cineol) at 10 temperatures between (278.15 and 323.15) K were measured by a static method. The reduction of the vapor pressures for obtaining activity coefficients and excess molar Gibbs energies was carried out by fitting the vapor pressure data to the Wilson equation according with Barker's method. Four equations of state (EOS) were used to correlate the vapor-liquid equilibrium (VLE) and for describing the volumetric behavior of the mixture. Two of them are modifications of the temperature-dependent function alpha(T(r)) in the attractive term of Peng-Robinson equation as proposed by Mathias (PRM) and by Stryjek-Vera (PRSV). In both cases a volume translation (VT) according to Peneloux was considered. The other two models applied are based on the theory of perturbations: statistical associating fluid theory (SAFT) and perturbed-chain statistical associating fluid theory (PC-SAFT). The best description of the phase equilibrium was achieved by the Stryjek-Vera modification, whereas SAFT and PC-SAFT provided the best volumetric results.