Remysen and Vincent discuss the biography and professional output of Oscar Dunn, contextualizing his work with attention to the earlier history of French Canadian lexicography and to the tension between British and French forces that characterized Québec during Dunn’s lifetime. Oscar Dunn defended and documented the French used in Québec, studying historical links between Canadian French and French from France and documenting Canadianisms that set apart speakers of Québécois French in terms of language and identity. The creator of the Glossaire franco-canadien (1880), the first glossary of Canadian French, Dunn contributed key work and thought to the understanding of Québécois French as distinct from European French, meriting attention as a linguistic and national entity in and of itself.