Densities, viscosities, and refractive indices have been measured for the binary liquid mixtures of isoamyl acetate or methyl benzoate with (o-, m-, and p-) xylenes and ethylbenzene over the entire composition range at (303.15 and 313.15) K. From the experimental data, the values of viscosity deviations Delta eta and deviation in molar refraction Delta R have been determined. The values of Delta eta and Delta R have been fitted to the Redlich-Kister polynomial equation to determine the binary coefficients and the standard deviation. The predictive ability of several one-, two-, and three-parameter viscosity models was also tested. It was observed that the viscosities were best correlated with the McAllister equation.