The Berlin ecclesiastical historian, August Neander (1789–1850), developed a religiously driven conception of history which excited contemporaries across the Protestant world. This article reconstructs the impetus which Neander gave to the creation of a religiously cosmopolitan historical imagination in Germany, Britain, and the United States. At a time when Hegelian and ‘scientific’ models of historical progress foretold a post-Christian future for civilization, Neander's alternative idea of world history, centred on the leavening spread of the invisible church through contrasting forms of Christianity and culture, exercised a powerful sway over Protestant historians everywhere. His universalizing historical philosophy offered an appealing mode of self-understanding to the networks which translated his ideas into new settings. Appearing to afford a mode of securing Protestantism from the twin dangers of sectarianism and unbelief, Neander's ‘unpartisan’ philosophy simultaneously became an important instrument of Protestant nation-building in the hands of the historians drawn towards it. By considering the interaction between universal and national aspirations in the development and dissemination of Neander's historical philosophy, the article examines the practical implications of historical thought, and connections between national and transnational scales of analysis, in modern religious and intellectual history.