This PhD project studies how Paris parishes operated at the economic level in the early modern period. Parishes are worth close examination because they were the basic structures within which most city dwellers accessed ritual services (church services, baptism, marriage, funerals, masses.) I hence underline the material and economic aspects of early modern European rites. This includes supply in perishable goods, textile, and precious metals, as well as infrastructures dedicated to worship and how their areal expansion occurred in the context of Paris development. I also study the economics, the finances and the organization of the laity-run parish vestry ('fabrique'), most of all its real estate properties, its financial annuities and how it provided basic ritual services (especially funerals.) In this perspective, I try to draw comparisons between Paris and other early modern big cities for which data is available, especially Naples. I also study the relationship between laity and clergy from an organizational point of view. Clerics (parish priests, regular priests) primarily were providers of ritual services alongside—and often subservient to—the laymen operating within the vestry. At the micro-level, I finally analyze the offering of alms by the faithful in its economic dimension. This PhD project aims at understanding how religious economy fitted within the broader urban economy in the early modern period and assessing what amount of economic ressources the Church actually needed to fulfill its core missions.