Isothermal vapor-liquid equilibria for o-, m-, and p-xylenes with N-methylpyrrolidone (NMF) at 373.15 K and 393.15 K have been measured. The results have been correlated using the NRTL, Wilson, and three-constant Redlich-Kister models. The root-mean-square deviation (RMSD) between experimental and calculated y-values show that the data for all the three xylenes with NMP are well represented by the Wilson, NRTL, and three-constant Redlich-Kister models.