Viscosities of the ternary mixture cyclohexane + 1-3-dioxolane + l-butanol and the binary mixtures cyclohexane + I-butanol and 1-3-dioxolane + l-butanol have been measured at normal pressure at 298.15 and 313.15 K. Viscosity deviations for the binary and ternary mixtures were fitted to Redlich-Kister's and Cibulka's equations respectively. The group contribution method proposed by Wu has been used to predict the viscosity of binary and ternary mixtures.