The vapor-liquid equilibrium at 101.3kPa has been determined for the ternary system 1-bromopropane + 1-chlorobutane + cyclohexane. The data were correlated by the Redlich-Kister and Wisniak-Tamir equations and the appropriate parameters are reported. The activity coefficients of the ternary system can be predicted from those of the pertinent binary systems. No ternary azeotrope is present.