Louis Philippe Adélard Langevin (French pronunciation: [lwi filip adelaʁ lɑ̃ʒvɛ̃]; August 23, 1855 – June 15, 1915) was a Canadian Oblate priest and Archbishop of Saint-Boniface.

[2] Langevin joined the Missionary Oblates of Mary Immaculate at Lachinein 1881, and was ordained a priest the following year by Monsignor Édouard-Charles Fabre, Bishop of Montreal.

During his episcopacy, Langevin was concerned with the question of the educational rights of Catholics on the Prairies after the abolition of the denominational school system in 1890.

A defender of equality between French and English Canadians, Langevin had a number of confrontations with Anglophone Catholic leaders.

He believed that the viability of Catholic culture in North America depended on both language and denominational instruction, and was not satisfied with the adoption of the Laurier-Greenway regulations in 1896, which allowed education in a language other than English, under certain conditions, and which authorized religious education in public schools after school hours.

To this end, Holy Ghost Parish was established in North Winnipeg to serve Polish Catholics.

Impressed with their work, Langevin wrote the Basilian superior requesting priests for the Ukrainians of Winnipeg.