Rabbi Avrohom Bornsztain (14 October 1838 – 7 February 1910), also spelled Avraham Borenstein or Bernstein, was a leading posek in late-nineteenth-century Europe and founder of the Sochatchover Hasidic dynasty. He is known as the Avnei Nezer ("Stones of the Crown") after the title of his posthumously-published set of Torah responsa. His only son, Shmuel, author of Shem Mishmuel, succeeded him as Rebbe.