When looking at the development of political Catholicism in Austria from the second half of the nineteenth-century onwards, it becomes apparent that historians have devoted surprisingly little attention to the place of religiosity within the movement. This article argues that popular piety and religious revival were important, indeed defining, features of the formation of the catholic political milieu in Austria. Moreover, the renewal of Catholic religiosity fulfilled a vital function during the decades before and after 1900, when major divisions surfaced within the catholic political space between Conservatives and Christian Socials. By examining one pertinent example of popular religiosity, namely the cult of the Sacred Heart of Jesus, the author seeks to show how mass religious activities not only helped to integrate political Catholicism’s social milieu throughout Austria, but provided a major source of internal, spiritual cohesion at a time when generational tensions and conflicts over ‘the social question’ divided Catholics.