R. Heinrich Ehrentreu (1854–1927), Orthodox German rabbi and author. Ehrentreu was born in Alt-Ofen (Obuda), Hungary. Considered a brilliant talmudist in the yeshivah of Pressburg, he later pursued Semitic studies at the University of Heidelberg (from 1877) and was a tutor in Mainz. Ehrentreu became preacher at the Ohel Jakob synagogue in Munich where he supervised and greatly developed the religious institutions of the Jewish community over a period of 42 years. He was a member of the German chapter of the Rabbinical Council of Agudat Israel. In 1897 Ehrentreu edited the last volume of R. N. Rabbinovicz’s Dikdukei Soferim 16 (1897). He also published Heker Halakhah ("Halakhic Research," 1904), and Minhat Pittin, halakhic essays published in 1927/28. Together with Rabbi Jacob Schor of Kuty, he wrote Zidkat ha-Zaddik (1910), a defense of Z. H. Auerbach's edition of Sefer ha-Eshkol, which had been attacked as a forgery by S. Albeck. His responsa and numerous articles were published in Jewish scholarly journals.