Joseph (Josef) Samuel Bloch (November 20, 1850 in Dukla, Austrian Galicia (now in Poland) – 1923) was an Austrian rabbi and deputy of Polish descent.
Bloch's parents, who were poor, destined him for the rabbinical career, and he devoted himself to the exclusive study of the Talmud. He frequented the yeshivot, especially that of Rabbi Josef Saul Nathanson at Lemberg, who, in his response, mentions Bloch, when he was only fifteen years old, as one of his most intelligent pupils. After having finished his studies at the colleges (gymnasia) of Magdeburg and Liegnitz, he went to the University of Munich. Thence he went to the University of Zurich, where he obtained his degree of doctor of philosophy.
He was appointed rabbi in Rendsburg, Holstein, afterward in Kobylin, Posen (Poznań), and Brüx, Bohemia; and finally he ended his rabbinical career in Floridsdorf, near Vienna.
Antisemitism was endemic in Austria during the late 19th century and was taking political center-stage from the 1870s on. Taking advantage of this, August Rohling, a Professor of Theology at one of the German universities, published a book, Der Talmudjude (1871), which became a bestseller and was read by hundreds of thousands (one Catholic organization distributed 38,000 copies free of charge). It rehashed the worst medieval libels concerning alleged hateful and debased Talmudic teachings and Jewish religious practices. Rohling became famous, continued even more intensified attacks against the Jews, and was eventually rewarded with an appointment to the Catholic theological faculty of Prague University. During the Tisza-Eszlár trial in 1883, Rohling made a written offer to substantiate under oath the blood ritual of the Jews, namely that their religion obliged them to eat Christian flesh in their rituals. The leading rabbis of Austria issued only a brief denial of any truth to the claim and tried otherwise to ignore these outrageous falsehoods, hoping that the controversy would fade away. But Rabbi Dr. Bloch, until then an obscure rabbi of a small and poor suburban congregation believed that a thorough and effective rebuttal had to be made, no matter what the ugliness of the conflict. He took on the challenge with a series of articles in which he openly accused Rohling of committing wilful perjury; Bloch also denounced Rohling, moreover, as a person utterly ignorant in Talmudic learning, not even able to translate a single page of Talmud. His articles caused a sensation; three editions of 100,000 copies sold out in a single day. As a Professor of Theology, Rohling had to respond to this very public challenge or lose all credibility and even his university position. After several successful attempts to delay the proceedings, when the trial could no longer be postponed Rohling preferred to withdraw completely, thus tacitly acknowledging defeat. He lost his professorship and became a byword amongst liberals for antisemitic falsifications, even if antisemites still honored him.