The Archdiocese of Paris is a Latin Church ecclesiastical jurisdiction or archdiocese of the Catholic Church in France. It is one of twenty-three archdioceses in France. The original diocese is traditionally thought to have been created in the 3rd century by St. Denis and corresponded with the Civitas Parisiorum; it was elevated to an archdiocese on October 20, 1622. Before that date the bishops were suffragan to the archbishops of Sens.

Denis of Paris was a 3rd-century Christian martyr and saint. According to his hagiographies, he was bishop of Paris in the third century and, together with his companions Rusticus and Eleutherius, was martyred for his faith by decapitation. Some accounts placed this during Domitian's persecution and incorrectly identified St Denis of Paris with the Areopagite who was converted by Paul the Apostle and who served as the first bishop of Athens. Assuming Denis's historicity, it is now considered more likely that he suffered under the persecution of the emperor Decius shortly after AD 250.