Séverin Létourneau (23 May 1871 – 17 December 1949) was a Canadian politician and judge from Quebec who served as Chief Justice of Quebec between 1943 and 1949. Létourneau was born in Saint-Constant, Quebec, the son of Hubert Létourneau and of Claire Vadney Lanctôt. He was educated at the École normale Jacques-Cartier and at the Université Laval à Montréal (now Université de Montréal), where he took the LL.B. in 1884. After articling in the chambers of Louis Conrad Pelletier, he was called to the Quebec bar on 9 July 1895. He was appointed King's Counsel on 30 June 1906.