Kinematic viscosities nu have been measured for binary liquid mixtures of butanol (n-C4H9OH) + pentane (n-C5H12), + hexane (n-C6H14), + heptane (n-C7H16), and + octane (n-C8H18) at T = 298.15 K. Values of nu have been used to calculate dynamic viscosities eta, using available density data. The values of the quantity Delta eta, which refers to the deviations of eta of mixtures from those arising from a mole fraction average, have also been calculated. The values of nu, eta, and Delta eta have been fitted in appropriate equations using a least-squares method. The analysis has shown that McAllister’s approach correlates the liquid-mixture viscosity data of the present systems throughout the entire composition range to a significantly high degree of accuracy, whereas Lobe’s approach predicts nu of mixtures to a lower degree of accuracy.