Zvi Hirsch Chajes (Hebrew: ??? ???? ???? - November 20, 1805 - October 12, 1855; also Chayes or Hayot) was one of the foremost Galician talmudic scholars.
He is best known for his work Mevo Hatalmud (Introduction to the Talmud), which serves both as commentary and introduction.
Chajes is also known as "The Maharatz Chajes" (???"? ????), the Hebrew acronym for "Our Teacher, the Rabbi, Zvi Chajes".
He is possibly the only commentator included in the back of the Vilna Shas edition with a PhD.
However, not everyone agrees that he actually received a doctorate.