Isobaric vapor-liquid equilibria (VLE) data for the ethylene glycol + 1,2-propylene glycol, 1,2-propylene glycol + 1,3-butanediol, 1,2-propylene glycol + 1,2-butanediol, and ethylene glycol + 1,3-butanediol binary systems have been measured at 10.00 kPa using a VLE recirculating still. The experimental VLE data were correlated with nonrandom two-liquid (NRTL), Wilson, and universal quasichemical (UNIQUAC) activity coefficient models. The results showed that the calculated values of the vapor-phase mole fraction and boiling temperature by the NRTL, Wilson, and UNIQUAC models agreed well with the experimental data. The experimental data were checked with the Herington consistency test and Van Ness test method, which also showed thermodynamic consistency.