Viscosities and densities of binary mixtures of toluene with acetic acid and propionic acid have been measured at (293.15, 303.15, 313.15, and 323.15) K over the complete compositional range. Viscosity deviations are calculated from the experimental data and the results have been fitted to a Redlich-Kister-type equation. The corresponding parameters have been derived. The McAllister equation has also been used to correlate the viscosity data. The results are discussed in terms of molecular interactions.