Abstract
This article argues that there is body of governing laws appearing widely throughout the global history of religions that warrants classification as constitutions. Like national constitutions, these religious constitutions present themselves as a form of "higher law" that declare the identity of a given a community, organize its structures of governing power, define its foundational norms, and authorize further acts of rulemaking. In this article, I offer an overview of these texts across several traditions and a defense of their importance in the study of comparative constitutional law. I then draw on fieldwork from Sri Lanka to provide a firsthand account of what a modern religious constitution looks like and how it works to govern one of the country's largest communities of Buddhist monks. I conclude by urging scholars to view religion and constitutional law not as opposing legal domains but, rather, as homologous forms of social ordering that draw upon similar concepts and logics to address common human dilemmas.