Compagnie de Navigation Sud-Atlantique was a French shipping line in the South American routes.

The new company placed orders for new ships, with the Chantiers de l'Atlantique at St. Nazaire for the SS Lutetia and with Forges & Chantiers de la Mediterranee at La Seyne for a similar ship, the SS Gallia, both to be delivered in 1913. The third ship was the SS Massilia, also built at La Seyne and launched in 1914, but not completed until 1920.

The Gallia was able to make the passage from Bordeaux to Buenos Aires in 15 days.The next major addition was the iconic L'Atlantique, in 1930 but its working life proved to be short, being destroyed by fire while sailing from Bordeaux to Le Havre in 1933. This necessitated the scrapping of the vessel. In 1939 the Pasteur (at 29,000 tonnes – reflecting lowered demand on the route) was added to the fleet.