Rabbi Yair Chayim Bacharach (1638, Lipník nad Bečvou, Moravia — 1702; also known by his work Chavos Yair or Chavot Yair) was a German rabbi and major 17th century posek, who lived first in Koblenz and then the remainder of his life in Worms and Mainz.[1] His grandmother Eva Bacharach was a granddaughter of the Maharal of Prague, and his father Moses Samson Bacharach, and grandfather had served as rabbis of Worms.