Vapor-liquid equilibrium (VLE) data for butane + methanol, + ethanol, + 2-propanol, + 2-butanol, and + 2-methyl-2-propanol (TBA) was measured at 323 K with a static total pressure apparatus. Measured pTz (pressure-temperature-total composition) data was reduced to liquid- and vapor-phase compositions using Barker's method. Azeotropic points were found for butane (1) + ethanol (x(1) = 0.970; T = 323.12 K; p = 501.1 kPa) and + methanol (x(1) = 0.908; T = 323.13 K; p = 528.2 kPa). Wilson, NRTL, and UNIQUAC model parameters were calculated. The fitted Legendre polynomial was compared against predictive UNIFAC and UNIFAC-Dortmund models, and an error analysis was made.