MS Sobieski was a Polish passenger ship launched in 1939. It was constructed for the South American service of the Gdynia-America Line – GAL to replace the aging SS Kościuszko and SS Pulaski. She was named in honour of the Polish king Jan III Sobieski. Sobieski was to be a sister ship to the MS Chrobry.

Kościuszko was a passenger steamship that was built in Scotland in 1915, sailed as a troopship in both World Wars, was an ocean liner between the wars, carried displaced persons after World War II and was scrapped in England in 1950.