Vapor-liquid equilibrium data were presented for the ethanol + 2-methyl-1-butanol system, obtained at three operating pressures. A modified Othmer still was used for data acquisition. When the Herington area test was applied to the experimental result, good thermodynamic consistency was found. Several equations based on both classic G(E) models (Margules and Van Laar) and local composition based models (Wilson, NRTL, and UNIQUAC) were used for data correlation. The UNIFAC group contribution model was applied to predict the activity coefficients of the binary system under study. Results for the ethanol + 2-methyl-1-butanol binary system showed a positive deviation from ideality at all pressures investigated.