Mary Queen of the World Cathedral

Mary, Queen of the World Cathedral or in full Mary, Queen of the World and St. James the Great Cathedral is a minor basilica in Montreal, Quebec, Canada, and the seat of the Roman Catholic Archdiocese of Montreal. It is the third largest church in Quebec after Saint Joseph's Oratory and the Basilica of Sainte-Anne-de-Beaupré east of Quebec City. The building is 101 m in length, 46 m in width, and a maximum height of 77 m at the cupola, the diameter of which is 23 m.

The church is located at 1085 Cathedral Street at the corner of René Lévesque Boulevard and Metcalfe Street, near the Bonaventure metro station and Central Station in downtown Montreal. It and the connected Archdiocese main buildings form the eastern side of Place du Canada, and occupies a dominant presence on Dorchester Square.