Isothermal vapor-liquid equilibria were measured for ethanol + octane at 343.15 K and 1-propanol + octane at 358.15 K. The measurements were made in a still with the aid of a computer for control of the temperature and measurement of the total pressure. The results were best correlated with the Wilson equation for the system of ethanol + octane and with the nonrandom two-liquid (NRTL) equations for the 1-propanol + octane system.