Moses Schreiber (1762–1839), known to his own community and Jewish posterity in the Hebrew translation as Moshe Sofer, also known by his main work Chatam Sofer, Chasam Sofer, or Hatam Sofer, was one of the leading Orthodox rabbis of European Jewry in the first half of the nineteenth century.

Orthodox Judaism is the collective term for the traditionalist branches of contemporary Judaism. Theologically, it is chiefly defined by regarding the Torah, both Written and Oral, as revealed by God to Moses on Mount Sinai and faithfully transmitted ever since.