A Pardon is a typically Breton form of pilgrimage and one of the most traditional demonstrations of popular Catholicism in Brittany. Of very ancient origin, probably dating back to the conversion of the country by the Celtic monks, it is comparable to the parades associated with Saint Patrick's Day in Ireland or New York.

A Pardon is a penitential ceremony. A Pardon occurs on the feast of the patron saint of a church or chapel, at which an indulgence is granted. Hence use of the word "Pardon". Pardons only occur in the traditionally Breton language speaking Western part of Brittany. They do not extend farther east than Guingamp.

The faithful go on a pilgrimage either to the tomb of a saint or a place dedicated to a saint. The locations may be associated with miraculous appearances, as in Querrien, or holy relics.

The Pardons begin in March and end in October, but the majority of them are between Easter and Michaelmas. Traditionally pilgrims wore their best costumes, each diocese and parish having a distinctive style, and otherwise only worn at weddings. However, traditional Breton costume is now not typically worn, except at the Locronan Pardon, in honour of Saint Ronan. Penitents travel as a group in parishes, fraternities or other corporate bodies, bringing banners, crosses and other insignia in procession, each group competing with the others for grandeur. The leader of the Pardon, typically a high ranking ecclesiastic, has the title of "pardonnor". If relics are involved, he will normally carry them during part of the procession. For most of the pilgrimage, however, this honour falls to those who were considered to be worthiest by it by the various social groups represented.