Saint Boniface Cathedral (French: Cathédrale Saint-Boniface) is a Roman Catholic basilica and the cathedral of Saint Boniface, Winnipeg, Manitoba, Canada. It is an important building in Winnipeg, and is the principal church in the Roman Catholic Archdiocese of Saint Boniface, serving the eastern part of Manitoba province as well as the local Franco-Manitoban community. The basilica sits in the centre of the city at 190 avenue de la Cathédrale, Saint Boniface.

The Cathedral faces the Red River. In Verendrye Park is a statue of Pierre La Vérendrye by Joseph-Émile Brunet. Across the river is The Forks in Downtown Winnipeg.

Between 1888 and 1906, the number of Catholics in Saint Boniface had increased from 2,154 to 4,615, almost all of them of French heritage. By 1900, Saint Boniface was the fifth-largest city in the West and needed a larger cathedral. Local contractors Senecal and Smith were engaged to build a new cathedral to plans by Montreal architect Jean-Omer Marchand. On August 15, 1906, Monsignor Louis-Philippe Adélard Langevin dedicated the cathedral, which became one of the most imposing churches in Western Canada.

On July 22, 1968, the 1906 cathedral was damaged by a fire which destroyed many of the structure's features and contents including the rose window, vestments, 1860 bells, and parish records. Only the façade, sacristy, and the walls of the old church remained. In 1972, a new, smaller cathedral, designed by Étienne Gaboury and Denis Lussier, was built behind the 1906 façade.

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