In the middle of the sanctuary is the altar of sacrifice. The base of this marble altar was originally the base of the marble pulpit, which was installed in 1930. This change was made during the restoration and renovations done in 2003. It is made of pure white Carrara marble and with panels of delicate pink Sienna marble.

Behind it is the high "Altar of Reservation" which was completed in 1902. It was donated by William Mackey and designed by J.A. Karch of Montreal. It is elaborately carved of Belgian marble and decorated with onyx stone from Mexico. Note the statue of Saint Patrick in the centre niche and the Celtic Cross at the top of the pinnacle.