Shmuel Bornsztain (2 November 1856 – 8 January 1926), also spelled Shmuel Borenstein or Bernstein, the second Sochatchover Rebbe, was known as the Shem Mishmuel by the title of his eight-volume work of Torah and Hasidic thought. He was a leading Hasidic thinker in early 20th century Europe and a Rebbe to thousands of Hasidim in the Polish cities of Sochaczew (Sochatchov) and Lodz.