Lazar Horowitz, or Eleazar HaLevi Ish Horowitz, Eleasar ben David Josua Hoeschel Horowitz, aka El'azar Hurwitz  (1803/1804, Floß, Upper Palatinate - June 11, 1868, Vöslau) was an Orthodox Rabbi who led the Orthodox Jewish community of Vienna during the Vormärz period.
Born in Bavaria, Horowitz was a student of Moses Sofer of Pressburg before moving to Vienna in 1828 to serve as the community's supervisor of Kosher meat. There, he collaborated with Reform Jewish rabbis of his day, such as Isaak Noah Mannheimer and Adolph Jellinek regarding synagogue protocol in the central synagogues of Vienna. In 1829, he drafted the bylaws of the central Stadttempel. Although he himself was an Orthodox Jew, he continued to pray occasionally in the Reform temple.
Horwitz wrote a book of halakhic responsa called "Yad Eleazar."
In 1863, Horowitz, along with Isaac Noah Mannheimer, defended Heinrich Graetz, in Viennese court when Graetz was accused of heresy for an article published by Leopold Kompert in a local journal. Graetz had written that the chapters in Isaiah referring to the Messiah were meant to be interpreted non-literally, and that they referred to a national Messiah instead of a personal one. Isaac Hirsch Weiss published a pamphlet entitled Neẓaḥ Yisrael in support of the testimony. On the other hand rabbis such Azriel Hildesheimer, criticized Horowitz for defending Graetz. See Heinrich Graetz #The Kompert Affair.
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