I start from the premise that globalization is likely to facilitate the growth of transnational networks of religious actors that, feeding off each other’s ideas and perhaps aiding each other with funds, form bodies whose main priority is the well-being and advance of their transnational religious community. In this chapter I want to examine the phenomenon of transnational religious actors and assess the claim that their activities undermine state sovereignty. In this context, I focus upon the Roman Catholic Church and the Organisation of the Islamic Conference.