Yehudah Aryeh Leib Alter (Hebrew: יהודה אריה ליב אלתר, 15 April 1847 – 11 January 1905), also known by the title of his main work, the Sfas Emes (Ashkenazic Pronunciation) or Sefat Emet שפת אמת‎ (Modern Hebrew), was a Hasidic rabbi who succeeded his grandfather, Rabbi Yitzchak Meir Alter, as the Av beis din (head of the rabbinical court) and Rav of Góra Kalwaria, Poland (known in Yiddish as the town of Ger), and succeeded Rabbi Chanokh Heynekh HaKohen Levin of Aleksander as Rebbe of the Gerrer Hasidim.