This chapter investigates the history of the idea of non-territorial autonomy as a form of corporate collective minority rights. The concept originated in the Habsburg Empire, where it was both implemented in several Austrian provinces, at least partly, as well as discussed theoretically by Austro-Marxist thinkers. While Zionist Jewish protagonists unsuccessfully suggested this form of minority protection at the Paris Peace Conference in 1919, it continued to be discussed and applied in several Eastern European countries, in particular in the Baltic states, often with reference to its Habsburg origins. The European Nationalities Congress, a transnational advocacy group of European minorities during the interwar period, also strongly supported the idea of non-territorial autonomy. The chapter argues that despite the Congress’s final inability to convince the League of Nations of this model of corporative minority rights, non-territorial autonomy was lively discussed in the international arena of European minority protection with the protagonists pointing to the legacy of the demised Habsburg Empire.