Isobaric vapor-liquid equilibria (VLE) were measured for the ternary system pentan-1-ol + pentyl acetate + nonane and for one constituent binary system, pentan-1-ol + pentyl acetate, at the pressures (26.66, 53.33, 79.99, and 101.32) kPa. Boiling temperature (T)-liquid composition (x) relations were obtained by using a semimicroebulliometer. The Wilson equation was used to correlate the binary T-x data and to predict VLE in the ternary system.