Menahem Mendel ben Meshullam Auerbach (1620 – July 8, 1689) (Hebrew: מנחם מענדל אויערבאך) was an Austrian rabbi, banker, and commentator born in Vienna at the beginning of the 17th century.
He was descended from the well-known Auerbach-Fischhof family, both his father, Meshullam Solomon, and his maternal grandfather, Rabbi Judah Loeb Rofe, being members of the Vienna Ghetto.
Auerbach received a Talmudic education, and was a pupil of Yoel Sirkes (ב"ח), of Joshua Höschel ben Joseph of Kraków, and of Menahem Mendel Krochmal of Nikolsburg.
In Krotoszyn he established a yeshibah, which soon became known throughout Poland, and to which he devoted much of his time and energy (Eliakim ben Meir, Responsa, § 61).
His son Moses was parnass of the district of Posen, one of the leaders of the Synod of Great Poland, and president of the Assembly of Kobylin in 1733.