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This paper provides a summary of credit practices in medieval Paris based on a variety of diplomatic and narrative sources. A study of the proceedings of royal justice at the Châtelet extends historical knowledge on the financial habits of the people of Paris, which, because of specific characteristics of documents related to Paris, have sometimes been viewed by historians as inadequate or archaic. Among other subjects, the following are examined : public and private income systems, private loans, collateral-based loans, credit in landlord and tenant relationships and in commercial relationships between wholesalers and retailers. In addition, the paper considers ways of thinking about such a pervasive relationship as credit in Late Middle Ages urban society.