Isaac Seckel ben Menahem Etthausen (; ) was a German rabbi, who served as a rabbi in various towns for a period spanning fifty-five years. He was the author of Or ne'elam, a collection of fifty-eight responsa relating to subjects he had discussed with Baruch Rapoport, Jonathan Eybeschütz, and others; and Ur lo be-Ẓiyyon, novellæ on Berakhot and Halakot Ḳeṭannot. Both works were published after his death by his son, Judah Löb Etthausen (Carlsruhe, 1765).
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