The equilibrium still of Rogalski and Malanowski was modified to-collect data for the methanol-benzene and methanol-thiophene systems. Two isothermal-sets (318.15 and 323.15 K) and one isobaric set (60.03 kPa) of data are presented for the system containing thiophene. For this system, data have not been reported in the literature for the 323.15 K isotherm nor for any isobar. In addition, isothermal data at 318.15 K and isobaric data at 69.52 kPa are presented for the methanol-benzene system. The data presented for methanol- benzene agree with available literature data. However, data for approximately twice as many compositions in-the dilute composition region as are available in the literature have been measured in this work. Data in this region-are useful for extracting infinite dilution values for the activity coefficients.