Isothermal vapor-liquid equilibria (VLE) were obtained for ethyl tert-butyl ether + n-alcohol(C-1-C-4) at 333.15 K by headspace gas chromatography, and excess molar volumes were determined from density measurements using a vibrating tube densimeter at 298.15 K. The binary mixtures showed positive deviation from the Raoult＇s law, and those containing methanol and ethanol have minimum boiling azeotropes. The excess molar volumes of all the binary mixtures were negative. The measured VLE data are well described using a modified UNIFAC equation (Dortmund), and excess molar volumes are correlated with the Redlich-Kister polynomial.