Yehiel Michel ben Avraham Epstein Ashkenazi (יחיאל מיכל בן אברהם עפשטיין אשכנזי), also known as Jeḥiel Michel Segal Epstein (Hebrew: יחיאל מיכל סג"ל עפשטיין) was a Sabbatean writer and ethicist who lived in the 17th century. In 1683, Yehiel Michel published Qitsur Shnei Luḥot haBrit also known as the Qitsur SheLaH, written after the style of Isaiah Horowitz's Shnei Luḥot haBrit (1648). A second edition, with numerous additions, and containing extracts from current ethical works, was published fifteen years later at Fürth, and a third edition with even more material was published in Amsterdam (1723). Unfortunately, nothing is known of his career. Jacob Emden publicized the Sabbatean nature of the work in his Torat Qinna'ot (1752) and explicit references to Shabbtai Tsvi were excised from subsequent editions. The Qitsur SheLaH is notable for introducing many mystical and liturgical traditions, always citing them, however, to manuscripts supposedly in the author's possession. Yehiel Michel also published Yiddish works, including Derekh ha-yashar le-olam haba, and has been called a "champion of Yiddish".