Judah David Bleich (born August 24, 1936 in Tarrytown, New York) is an authority on Jewish law and ethics, including Jewish medical ethics. He is a professor of Talmud (rosh yeshiva) at the Rabbi Isaac Elchanan Theological Seminary, an affiliate of Yeshiva University, as well as head of its postgraduate institute for the study of Talmudic jurisprudence and family law. At Yeshiva University, he holds the Herbert and Florence Tenzer Chair in Jewish Law and Ethics. He also teaches at Cardozo Law School. He is married to Dr. Judith Bleich, a historian of 19th-century European Jewry.

Bleich brings an Orthodox perspective to governmental deliberations on bioethics. For example, in 1988 he served on the NIH Human Fetal Tissue Transplantation Research Panel and testified before Congress on the Pain Relief Promotion Act. In 1984, New York Governor Mario Cuomo appointed Bleich to the Governor's Commission on Life and the Law.