Meir ben Izsak Eisenstadt (Hebrew: מאיר איזנשטט, also Meir Ash, c. 1670 in Poznań – 1744 in Eisenstadt) was the author of responsa and other works of rabbinic literature. An authority on Halakha, he was consulted by rabbis from Turkey, Germany and Italy. He is known as the Panim Me'irot (or Punim Meirois in Yiddish) after his major work called Shu"t Panim Me'irot. He is also known as the Maharam Ash (or Maharam Esh) the Hebrew acronym for "Our Teacher, Rabbi Meir EisenStadt".