Vapor-liquid equilibrium (VLE) data for 1-butene + methanol, + 1-propanol, + 2-propanol, + 2-butanol, and + 2-methy1-2-propanol were measured at 364.5 K with a static total pressure apparatus. Measured p, T, z data were reduced to liquid and vapor phase compositions using the Barker method. Azeotropic points were found for the 1-butene + methanol system (x(1) = 0.877, T = 364.5 K, p = 1606.2 kPa). From measured data, the Wilson, NRTL, and UNIQUAC parameters were calculated. The fitted Legendre polynomial was compared with the predictive UNIFAC and UNIFAC-Dortmund methods, and an error analysis was made.