Reliable viscosities and molar volumes are reported for some binary and ternary liquid mixtures containing carbon tetrachloride, tetrachloroethylene, benzene, toluene and pyridine. Similarities are observed in the shapes of the viscosity and vapor pressure curves for the binary systems. Systems exhibiting linear vapor pressure vs. mole fraction curves also exhibit, with some exceptions, linear viscosity vs. mole fraction curves. Maxima and minima found for some systems on the vapor pressure vs. mole fraction curves are often observed on the viscosity vs. mole fraction curves. This is especially true for systems containing species close in viscosity values. The viscosity vs. mole fraction data for the binary systems are well correlated with a modified Katti-Heric equation. One ternary constant, in addition to the respective binary system constants, predicts the viscosities of ternary systems well.