Charles Marius Barbeau, CC FRSC (March 5, 1883 – February 27, 1969), also known as C. Marius Barbeau, or more commonly simply Marius Barbeau, was a Canadian ethnographer and folklorist who is today considered a founder of Canadian anthropology. A Rhodes Scholar, he is best known for an early championing of Québecois folk culture, and for his exhaustive cataloguing of the social organization, narrative and musical traditions, and plastic arts of the Tsimshianic-speaking peoples in British Columbia (Tsimshian, Gitxsan, and Nisga'a), and other Northwest Coast peoples. He developed unconventional theories about the peopling of the Americas.

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