Pachad Yitzchok (or Pachad Yitschak) may refer to: Hebrew of "Fear of Isaac", a Biblical reference in Genesis 31:42 (an allusion to God) The writings or person of Rabbi Yitzchok Hutner (1906–1980) The writings or person of Rabbi Yitzchok Friedman (1850–1917), First Rebbe of Boyan Yeshiva Pachad Yitzchok A rabbinic encyclopedia authored by Isaac Lampronti (1679-1756)