Sauveur Marcoux (May 2, 1893 – November 16, 1951) was a politician in Manitoba, Canada. He served in the Legislative Assembly of Manitoba as a Liberal-Progressive from 1936 until the time of his death, and was a cabinet minister in the governments of John Bracken, Stuart Garson and Douglas Campbell.
The son of Leon Marcoux and Adeline Ferland, Marcoux was born in Lorette, Manitoba, was educated in Lorette and St. Boniface, and worked as a farmer. He served as reeve for the Rural Municipality of Taché and was an active member of l'Association des Canadiens-Français du Manitoba and in l'Association des Commissaires d'écoles Canadiens-Français du Manitoba. He was also a member of the Laurier Club and the Canadian Club. He was a Liberal by background, and became a member of the Liberal-Progressives following the merger of the two constituent parties. In 1920, Marcoux married Eloria Normandeau.
He was first elected to the Manitoba legislature in the 1936 provincial election,