血祭誹謗（Blood libel[1][2]）指的是一則反猶太人謠言[3][4][5]，聲稱猶太人會謀殺基督教徒的小孩，用他們的血來進行宗教儀式。該謠言在歷史上與井中投毒、褻瀆聖體並稱歐洲抹黑猶太人的三大謊言。
Gottheil, Richard; Strack, Hermann L.; Jacobs, Joseph. Blood Accusation. Jewish Encyclopedia. New York: Funk & Wagnalls. 1901–1906 [2021-02-04]. （原始內容存檔於2019-12-07）. Turvey, Brent E. Criminal Profiling: An Introduction to Behavioral Evidence Analysis, Academic Press, 2008, p. 3. "Blood libel: An accusation of ritual murder made against one or more persons, typically of the Jewish faith".
Chanes, Jerome A. Antisemitism: A Reference Handbook, ABC-CLIO, 2004, pp. 34–45. "Among the most serious of these [anti-Jewish] manifestations, which reverberate to the present day, were those of the libels: the leveling of charges against Jews, particularly the blood libel and the libel of desecrating the host."
Goldish, Matt. Jewish Questions: Responsa on Sephardic Life in the Early Modern Period, Princeton University Press, 2008, p. 8. "In the period from the twelfth to the twentieth centuries, Jews were regularly charged with blood libel or ritual murder – that Jews kidnapped and murdered non-Jews as part of a Jewish religious ritual."
