Since 9/11, U.S. Muslim philanthropy has generally been framed in terms of national security and civil liberties. In practice, however, U.S. Muslims’ charitable giving has posed no threat to national security, nor has the government’s closing of some of the largest Muslim relief organizations after 9/11 had the chilling effect that many predicted it would have on U.S. Muslims’ giving. This article argues that American Muslim philanthropy post-9/11 belies enduring presuppositions about the alleged ‘rigidity” of Islamic norms and the alleged “insularity” of the U.S. Muslim community. Each of these presuppositions has yielded widespread misapprehensions about the nature of Muslim philanthropy in the U.S. since 9/11. Contrary to these misapprehensions, the actual philanthropic practice of the U.S. Muslim community in the post-9/11 moment highlights the polyvalence and fluidity of the public practice of Islam. In the fluid space of practice, American Muslims have brought together Islamic vocabularies of charity and American legal and sociopolitical norms regarding philanthropy to forge new relations across groups of varying social, religious, political, cultural, and economic backgrounds.