Klausenburg, also known as Sanz-Klausenburg, is a Hasidic dynasty that originated in the Transylvanian city of Cluj-Napoca, today in Romania.

Hasidism, sometimes spelled Chassidism, and also known as Hasidic Judaism, is a religious movement within Judaism that arose as a spiritual revival movement in Poland and contemporary Western Ukraine, during the 18th century, and spread rapidly throughout Eastern Europe. Today, most of those affiliated with the movement, known as hassidim, reside in Israel and in the United States.