Michael Yechiel Sachs (Hebrew: מיכאל יחיאל זַקש; 3 September 1808 – 31 January 1864) was a Prussian rabbi from Groß-Glogau, Silesia.

He took the conservative side against the Reform agitation, and so strongly opposed the introduction of the organ into the Synagogue that he retired from the Rabbinate rather than acquiesce.

[1] Sachs was one of the greatest preachers of his age, and published two volumes of Sermons (Predigten, 1866–1891).

He turned his poetic gifts to admirable account in his translation of the Festival Prayers (Machzor, 9 vols., 1855), a new feature of which was the metrical rendering of the medieval Hebrew hymns.

Another very popular work by Sachs contains poetic paraphrases of Rabbinic legends (Stimmen vom Jordan und Euphrat, 1853).