Bubble point temperatures at atmospheric pressure of 95.2 kPa are measured for the binary systems propan-1-ol (1) + 1-phenylethanone (2), propan-2-ol (1) + 1-phenylethanone (2), 2-methyl-1-propanol (1) + 1-phenylethanone (2), and 2-butanol (1) + 1-phenylethanone (2) using a Swietoslawski-type ebulliometer. The liquid-phase mole fraction, x(1), versus bubble point temperature, T, measurements are found to be well represented by the Wilson model. The optimum Wilson parameters are used to calculate the vapor-phase composition, activity coefficients, and excess Gibbs free energy and the results compared with the values of activity coefficients of the mixtures calculated using the UNIFAC group contribution method. The results are discussed.