The beautifully decorated Chapels surrounding the Sanctuary were built before the Second Vatican Council, at a time when each Priest would celebrate daily Mass on an individual basis. Above all the Chapels is a large mosaic illustrating the history of the Eucharist in the Church. This mosaic extends around the Sanctuary as a crown above the ten Chapels. Each Chapel is dedicated to a different Saint that has made a significant contribution in the Church.

• Saint Alphonsus, founder of the Congregation of the Redemptorists
• Our Lady of Perpetual Help, whose devotion is entrusted to the Redemptorists
• Saint Patrick, in honour of the numerous Irish pilgrims
• Saint Joseph, the son-in-law of Saint Anne
• Saint Benedict, a spiritual leader, founder of the Benedictines, the origin of all religious congregations
• Saint John Baptist de la Salle, educator and founder of Christian schools
• Saint Joachim, husband of Saint Anne
• Saint John the Baptist, patron of French Canadians
• Chapel of the Blessed Sacrament, Chapel of the Reserve Tabernacle
• Saint Gerard Majella, Redemptorist brother, a remarkable Saint