Shmuel Schneersohn was an Orthodox rabbi and the fourth Rebbe of the Chabad Lubavitch Chasidic movement.

Chabad, also known as Lubavitch, Habad and Chabad-Lubavitch, is an Orthodox Jewish Hasidic dynasty. Chabad is one of the world's best-known Hasidic movements. It is one of the largest Hasidic groups as well as one of the largest Jewish religious organizations in the world. Unlike most Haredi groups, which are self-segregating, Chabad mainly operates in the wider world and it caters to secularized Jews.