MS St. Louis was a diesel-powered ocean liner built by the Bremer Vulkan shipyards in Bremen for Hamburg America Line (HAPAG). She was named after the city of St. Louis, Missouri. She was the sister ship of Milwaukee. St. Louis regularly sailed the trans-Atlantic route from Hamburg to Halifax, Nova Scotia and New York City, and made cruises to the Canary Islands, Madeira, Spain, and Morocco. St. Louis was built for both transatlantic liner service and for leisure cruises.