Vapor-liquid equilibria (VLE) data for acetic acid + benzene, chloroacetic acid + benzene, and dichloroacetic acid + benzene binary systems have been measured at 101.33 kPa using a recirculating still. The experimental data were checked with the Herington method, which showed thermodynamic consistency. The Wilson, nonrandom two-liquid (NRTL), and universal quasi-chemical (UNIQUAC) activity coefficient models, combined with the Hayden-O'Connell equation, to account for the nonideality of the vapor phase due to the association of the acetic acid, were used to correlate the VLE data. The Wilson model correlated the experimental results better than the NRTL and UNIQUAC models.