Measurements of isothermal VLE for the systems n-pentane with n-hexane at 298.7, 303.7 and 308.7 K, n-octane at 303.7, 308.7 and 313.7 K and n-decane at 317.7 and 333.7 K are presented. These data can be used for the design of industrial equipment or with the data for the n-pentane + n-propanol system (Rice et al., 1990) for testing thermodynamic theories. The data satisfied the point-to-point consistency test. Using the maximum likelihood method the data was correlated with the Wilson (1964), the NRTL (Renon and Prausnitz, 1968) and the UNIQUAC (Abrams and Prausnitz, 1975) equations. Prior to this vapour pressure measurements were made to evaluate the equipment and enthalpies of vaporization were calculated. Both these parameters showed acceptable agreement with literature values.