The relationship between European sociology and European anti-Semitism in the nineteenth and early twentieth centuries is investigated through a case study of one sociologist, Émile Durkheim, in a single country, France. Reactionary and radical forms of anti-Semitism are distinguished and contrasted to Durkheim's sociological perspective. Durkheim's remarks about the Jews directly addressed anti-Semitic claims about them, their role in French society, and their relationship to modernity. At the same time, Durkheim was engaged in a reinterpretation of the French Revolution and its legacies that indirectly challenged other tenets of French anti-Semitism. In sum, Durkheim's work contains direct and indirect responses to reactionary and radical forms of anti-Semitism, and together these responses form a coherent alternative vision of the relationship between modernity and the Jews.