Of all the varieties of modern Jewish politics, none has experienced a more curious fate than Diaspora Nationalism. This nonterritorial strain of Jewish nationalism, also known as Autonomism, was once widely regarded as “together with Zionism the most important political expression of the Jewish people in the modern era.” From its fin-de-siècle origins in the Russian and Austro-Hungarian empires, it spread rapidly across Eastern Europe, sprouting various movements for Jewish national-cultural autonomy. After World War II, however, Diaspora Nationalism vanished almost overnight. So too was its intellectual afterlife marked by silence, as postwar historians of Jewish political thought largely ignored its legacy. Recently, however, Diaspora Nationalism has emerged as a growing field of scholarship. The results are impressive: a striking new wave of studies on its intellectual leadership, political parties, cultural projects, and various interwar East European Autonomist experiments. This abundance of fresh research promises to reframe not only the history of Diaspora Nationalism, but also that of Zionism and Jewish nationalism more generally.