Otzar Mishna is the monumental book by Rabbi Shmaryahu Leib Halevi Hurwitz, which was published in New York in 1935–1936. The goal of the project was to aid the study and understanding of the Mishna for the public, especially in the characteristics of the book and its content.

Scope and Commentary: The book contains the dotted Mishnayot, accompanied by the commentary of the "Bartanura" and "Ikr Tosafot Yom Tov". Translation and Explanation: The text is translated and explained in the Yiddish language that was common among learners at the time. Halacha and Practice: The book also includes Halacha clarifications ("clear Halacha") and practical instructions with the aim of connecting Halacha and Mishna to practical life, a time when Jews in the United States needed accessible tools to strengthen their identity and Torah knowledge.