Vincent de Paul had great concern for the celebration of Mass, so much so that it was mentioned specifically in the bull of establishment of the Congregation of the Mission. This concern existed especially because during his time not every priest had been trained to do it properly. This article describes the elements of Mass that were uniquely French and what we know of how Vincent himself celebrated it using descriptions from his biographers and information from a series of engravings published in Le Tableau de la Croix in1651.