SS Saint-Laurent was an ocean liner operated by Compagnie Générale Transatlantique (CGT) in transatlantic service.

She was built by the Chantier Scott shipyard in Saint-Nazaire, France, and was the first transatlantic ocean liner constructed in France, as well as CGT's first screw-driven liner.^[1][2] Her design was based on the Cunard Line's RMS Persia, albeit adapted to screw propulsion.^[2] She was launched in 1866, and entered service on CGT's route between Le Havre and New York City, before sailing to Central America later in her career.^[1] She operated until 1902, when she was scrapped in Italy.^[1]

Saint-Laurent measured 3,413 gross register tons, with a length of 355 feet (108 m) and a beam of 43.75 feet (13.34 m).^[1] She had a passenger capacity of 211—128 in first class, 54 in second class, and 29 in third class.^[1] She was originally built with a single compound steam engine driving one screw and a three-masted sailing rig, capable of propelling her to a 12 knots (14 mph) service speed; in 1875 and 1876 she received new triple expansion engines.^[1] Her screw propulsion was a major improvement over CGT's existing paddlewheel steamships, and spurred the company to convert most of its fleet in North Atlantic service to screws.^[2]