This article examines the role of the German language in early Jewish nationalism. It focuses on the publication, reception, and afterlife of the pamphletAutoemancipation!, published in 1882 by Leon Pinsker, a Russian Jewish doctor. The first Jewish nationalist pamphlet to be written in German by a Russian Jew, its rhetoric and terminology tapped into various Jewish and European discourses of emancipation. Pinsker not only challenged the legal-political conception of emancipation as it had been commonly used in German-Jewish discourse, but also mobilized its social and revolutionary connotations, which had been associated with radical European political movements since 1848. Moreover,Autoemancipation!marked a shift in Jewish political culture with regard to the potential function of the German language. Since the late eighteenth century and through the nineteenth century, German had a controversial status in Central and Eastern European Jewish societies given its association with Jewish Enlightenment, religious reform, secularization, and assimilation. Pinsker was the first to use German as a transnational language aimed at promoting the Jewish national cause. In this respect,Autoemancipation!set in motion a process whereby German became the chief language of Jewish nationalist activism.